Add cookbook and tutorial showcase demos

tests/demo/:
- cookbook_showcase.py: Interactive demo of cookbook recipes
- tutorial_showcase.py: Visual walkthrough of tutorial content
- tutorial_screenshots.py: Automated screenshot generation
- new_features_showcase.py: Demo of modern API features
- procgen_showcase.py: Procedural generation examples
- simple_showcase.py: Minimal working examples

Created during docs modernization to verify cookbook examples work.

🤖 Generated with Claude Code (https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

explanation/headless-automation.md

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+# Headless Mode and Automation
+
+McRogueFace supports headless operation for automated testing, CI/CD pipelines, and programmatic control without a display.
+
+## Running Headless
+
+Launch with the `--headless` flag:
+
+```bash
+mcrogueface --headless --exec game.py
+```
+
+Or use xvfb for a virtual framebuffer (required for rendering):
+
+```bash
+xvfb-run -a -s "-screen 0 1024x768x24" mcrogueface --headless --exec game.py
+```
+
+## Time Control with mcrfpy.step()
+
+In headless mode, you control time explicitly rather than waiting for real-time to pass. The `step()` function takes **seconds** as a float:
+
+```python
+import mcrfpy
+
+# Advance simulation by 100ms
+mcrfpy.step(0.1)
+
+# Advance by 1 second
+mcrfpy.step(1.0)
+
+# Advance by 16ms (~60fps frame)
+mcrfpy.step(0.016)
+```
+
+### Why This Matters
+
+Traditional timer-based code waits for real time and the game loop:
+
+```python
+# OLD PATTERN - waits for game loop, subject to timeouts
+def delayed_action(timer, runtime):
+    print("Action!")
+    sys.exit(0)
+
+mcrfpy.Timer("delay", delayed_action, 500, once=True)
+# Script ends, game loop runs, timer eventually fires
+```
+
+With `mcrfpy.step()`, you control the clock synchronously:
+
+```python
+# NEW PATTERN - instant, deterministic
+mcrfpy.Timer("delay", delayed_action, 500, once=True)
+mcrfpy.step(0.6)  # Advance 600ms - timer fires during this call
+```
+
+### Timer Behavior
+
+- Timers fire **once per `step()` call** if their interval has elapsed
+- To fire a timer multiple times, call `step()` multiple times:
+
+```python
+count = 0
+def tick(timer, runtime):
+    global count
+    count += 1
+
+timer = mcrfpy.Timer("tick", tick, 100)  # Fire every 100ms
+
+# Each step() processes timers once
+for i in range(5):
+    mcrfpy.step(0.1)  # 100ms each
+
+print(count)  # 5
+```
+
+## Screenshots
+
+The `automation.screenshot()` function captures the current frame:
+
+```python
+from mcrfpy import automation
+
+# Capture screenshot (synchronous in headless mode)
+result = automation.screenshot("output.png")
+print(f"Screenshot saved: {result}")
+```
+
+**Key insight:** In headless mode, `screenshot()` is synchronous - no timer dance needed.
+
+## Testing Patterns
+
+### Synchronous Test Structure
+
+```python
+#!/usr/bin/env python3
+import mcrfpy
+import sys
+
+# Setup scene
+scene = mcrfpy.Scene("test")
+scene.activate()
+mcrfpy.step(0.1)  # Initialize scene
+
+# Create test objects
+frame = mcrfpy.Frame(pos=(100, 100), size=(50, 50))
+scene.children.append(frame)
+
+# Verify state
+if frame.x != 100:
+    print("FAIL: frame.x should be 100")
+    sys.exit(1)
+
+print("PASS")
+sys.exit(0)
+```
+
+### Testing Animations
+
+```python
+# Create frame and start animation
+frame = mcrfpy.Frame(pos=(100, 100), size=(50, 50))
+scene.children.append(frame)
+
+anim = mcrfpy.Animation("x", 200.0, 1.0, "linear")  # 1 second duration
+anim.start(frame)
+
+# Advance to midpoint (0.5 seconds)
+mcrfpy.step(0.5)
+# frame.x should be ~150 (halfway between 100 and 200)
+
+# Advance to completion
+mcrfpy.step(0.6)  # Past the 1.0s duration
+# frame.x should be 200
+
+if frame.x == 200.0:
+    print("PASS: Animation completed")
+    sys.exit(0)
+```
+
+### Testing Timers
+
+```python
+callback_count = 0
+
+def on_timer(timer, runtime):
+    """Timer callbacks receive (timer_object, runtime_ms)"""
+    global callback_count
+    callback_count += 1
+    print(f"Timer fired! Count: {callback_count}, runtime: {runtime}ms")
+
+# Create timer that fires every 100ms
+timer = mcrfpy.Timer("test", on_timer, 100)
+
+# Advance time - each step() can fire the timer once
+mcrfpy.step(0.15)  # First fire at ~100ms
+mcrfpy.step(0.15)  # Second fire at ~200ms
+
+if callback_count >= 2:
+    print("PASS")
+    sys.exit(0)
+```
+
+### Testing with once=True Timers
+
+```python
+fired = False
+
+def one_shot(timer, runtime):
+    global fired
+    fired = True
+    print(f"One-shot timer fired! once={timer.once}")
+
+# Create one-shot timer
+timer = mcrfpy.Timer("oneshot", one_shot, 100, once=True)
+
+mcrfpy.step(0.15)  # Should fire
+mcrfpy.step(0.15)  # Should NOT fire again
+
+if fired:
+    print("PASS: One-shot timer worked")
+```
+
+## Pattern Comparison
+
+| Aspect | Timer-based (old) | step()-based (new) |
+|--------|-------------------|-------------------|
+| Execution | Async (game loop) | Sync (immediate) |
+| Timeout risk | High | None |
+| Determinism | Variable | Consistent |
+| Script flow | Callbacks | Linear |
+
+## LLM Agent Integration
+
+Headless mode enables AI agents to interact with McRogueFace programmatically:
+
+1. **Observe**: Capture screenshots, read game state
+2. **Decide**: Process with vision models or state analysis
+3. **Act**: Send input commands, modify game state
+4. **Verify**: Check results, capture new state
+
+```python
+from mcrfpy import automation
+
+# Agent loop
+while not game_over:
+    automation.screenshot("state.png")
+    action = agent.decide("state.png")
+    execute_action(action)
+    mcrfpy.step(0.1)  # Let action take effect
+```
+
+## Best Practices
+
+1. **Use `mcrfpy.step()`** instead of real-time waiting for all headless tests
+2. **Initialize scenes** with a brief `step(0.1)` after `activate()`
+3. **Be deterministic** - same inputs should produce same outputs
+4. **Test incrementally** - advance time in small steps to catch intermediate states
+5. **Use `sys.exit(0/1)`** for clear pass/fail signals to test runners
+6. **Multiple `step()` calls** to fire repeating timers multiple times
+
+## Running the Test Suite
+
+```bash
+# Quick run with pytest wrapper
+pytest tests/ -q --mcrf-timeout=5
+
+# Using the original runner with xvfb
+xvfb-run -a python3 tests/run_tests.py -q
+
+# Run specific test directly
+xvfb-run -a mcrogueface --headless --exec tests/unit/test_animation.py
+```
+
+## Related Topics
+
+- [Animation System](animation.md) - How animations work
+- [Scene API](scene-api.md) - Managing scenes
+- [Timer API](timer-api.md) - Timer details

tests/KNOWN_ISSUES.md

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+# McRogueFace Test Suite - Known Issues
+
+## Test Results Summary
+
+As of 2026-01-14, with `--mcrf-timeout=5`:
+- **120 passed** (67%)
+- **59 failed** (33%)
+  - 40 timeout failures (tests requiring timers/animations)
+  - 19 actual failures (API changes, missing features, or bugs)
+
+## Synchronous Testing with `mcrfpy.step()`
+
+**RECOMMENDED:** Use `mcrfpy.step(t)` to advance simulation time synchronously instead of relying on Timer callbacks and the game loop. This eliminates timeout issues and makes tests deterministic.
+
+### Old Pattern (Timer-based, async)
+
+```python
+# OLD: Requires game loop, subject to timeouts
+def run_tests(timer, runtime):
+    # tests here
+    sys.exit(0)
+
+mcrfpy.Timer("run", run_tests, 100, once=True)
+# Script ends, game loop runs, timer eventually fires
+```
+
+### New Pattern (step-based, sync)
+
+```python
+# NEW: Synchronous, no timeouts
+import mcrfpy
+import sys
+
+# Setup scene
+scene = mcrfpy.Scene("test")
+scene.activate()
+mcrfpy.step(0.1)  # Initialize scene
+
+# Run tests directly
+frame = mcrfpy.Frame(pos=(100, 100), size=(100, 100))
+scene.children.append(frame)
+
+# Start animation
+anim = mcrfpy.Animation("x", 500.0, 1.0, "linear")
+anim.start(frame)
+
+# Advance simulation to complete animation
+mcrfpy.step(1.5)  # Advances 1.5 seconds synchronously
+
+# Verify results
+if frame.x == 500.0:
+    print("PASS")
+    sys.exit(0)
+else:
+    print("FAIL")
+    sys.exit(1)
+```
+
+### Key Differences
+
+| Aspect | Timer-based | step()-based |
+|--------|-------------|--------------|
+| Execution | Async (game loop) | Sync (immediate) |
+| Timeout risk | High | None |
+| Determinism | Variable | Consistent |
+| Timer firing | Once per step() call | Per elapsed interval |
+
+### Timer Behavior with `step()`
+
+- Timers fire once per `step()` call if their interval has elapsed
+- To fire a timer multiple times, call `step()` multiple times:
+
+```python
+# Timer fires every 100ms
+timer = mcrfpy.Timer("tick", callback, 100)
+
+# This fires the timer ~6 times
+for i in range(6):
+    mcrfpy.step(0.1)  # Each step processes timers once
+```
+
+## Refactored Tests
+
+The following tests have been converted to use `mcrfpy.step()`:
+- simple_timer_screenshot_test.py
+- test_animation_callback_simple.py
+- test_animation_property_locking.py
+- test_animation_raii.py
+- test_animation_removal.py
+- test_timer_callback.py
+- test_timer_once.py
+- test_simple_callback.py
+- test_empty_animation_manager.py
+- test_frame_clipping.py
+- test_frame_clipping_advanced.py
+- test_grid_children.py
+- test_color_helpers.py
+- test_no_arg_constructors.py
+- test_properties_quick.py
+- test_simple_drawable.py
+- test_python_object_cache.py
+- WORKING_automation_test_example.py
+
+## Remaining Timeout Failures
+
+These tests still use Timer-based async patterns:
+- benchmark_logging_test.py
+- keypress_scene_validation_test.py
+
+**Headless mode tests:**
+- test_headless_detection.py
+- test_headless_modes.py
+
+## Running Tests
+
+```bash
+# Quick run (5s timeout, many timeouts expected)
+pytest tests/ -q --mcrf-timeout=5
+
+# Full run (30s timeout, should pass most timing tests)
+pytest tests/ -q --mcrf-timeout=30
+
+# Filter by pattern
+pytest tests/ -k "bsp" -q
+
+# Run original runner
+python3 tests/run_tests.py -q
+```
+
+## Recommendations
+
+1. **For CI:** Use `--mcrf-timeout=10` and accept ~30% timeout failures
+2. **For local dev:** Use `--mcrf-timeout=30` for comprehensive testing
+3. **For quick validation:** Use `-k "not animation and not timer"` to skip slow tests

tests/conftest.py

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+"""
+Pytest configuration for McRogueFace tests.
+
+Provides fixtures for running McRogueFace scripts in headless mode.
+
+Usage:
+    pytest tests/ -q                    # Run all tests quietly
+    pytest tests/ -k "bsp"              # Run tests matching "bsp"
+    pytest tests/ -x                    # Stop on first failure
+    pytest tests/ --tb=short            # Short tracebacks
+"""
+import os
+import subprocess
+import pytest
+from pathlib import Path
+
+# Paths
+TESTS_DIR = Path(__file__).parent
+BUILD_DIR = TESTS_DIR.parent / "build"
+LIB_DIR = TESTS_DIR.parent / "__lib"
+MCROGUEFACE = BUILD_DIR / "mcrogueface"
+
+# Default timeout for tests (can be overridden with --timeout)
+DEFAULT_TIMEOUT = 10
+
+
+def pytest_addoption(parser):
+    """Add custom command line options."""
+    parser.addoption(
+        "--mcrf-timeout",
+        action="store",
+        default=DEFAULT_TIMEOUT,
+        type=int,
+        help="Timeout in seconds for each McRogueFace test"
+    )
+
+
+@pytest.fixture
+def mcrf_timeout(request):
+    """Get the configured timeout."""
+    return request.config.getoption("--mcrf-timeout")
+
+
+@pytest.fixture
+def mcrf_env():
+    """Environment with LD_LIBRARY_PATH set for McRogueFace."""
+    env = os.environ.copy()
+    existing_ld = env.get('LD_LIBRARY_PATH', '')
+    env['LD_LIBRARY_PATH'] = f"{LIB_DIR}:{existing_ld}" if existing_ld else str(LIB_DIR)
+    return env
+
+
+@pytest.fixture
+def mcrf_exec(mcrf_env, mcrf_timeout):
+    """
+    Fixture that returns a function to execute McRogueFace scripts.
+
+    Usage in tests:
+        def test_something(mcrf_exec):
+            passed, output = mcrf_exec("unit/my_test.py")
+            assert passed
+    """
+    def _exec(script_path, timeout=None):
+        """
+        Execute a McRogueFace script in headless mode.
+
+        Args:
+            script_path: Path relative to tests/ directory
+            timeout: Override default timeout
+
+        Returns:
+            (passed: bool, output: str)
+        """
+        if timeout is None:
+            timeout = mcrf_timeout
+
+        full_path = TESTS_DIR / script_path
+
+        try:
+            result = subprocess.run(
+                [str(MCROGUEFACE), '--headless', '--exec', str(full_path)],
+                capture_output=True,
+                text=True,
+                timeout=timeout,
+                cwd=str(BUILD_DIR),
+                env=mcrf_env
+            )
+
+            output = result.stdout + result.stderr
+            passed = result.returncode == 0
+
+            # Check for PASS/FAIL in output
+            if 'FAIL' in output and 'PASS' not in output.split('FAIL')[-1]:
+                passed = False
+
+            return passed, output
+
+        except subprocess.TimeoutExpired:
+            return False, "TIMEOUT"
+        except Exception as e:
+            return False, str(e)
+
+    return _exec
+
+
+def pytest_collect_file(parent, file_path):
+    """Auto-discover McRogueFace test scripts."""
+    # Only collect from unit/, integration/, regression/ directories
+    try:
+        rel_path = file_path.relative_to(TESTS_DIR)
+    except ValueError:
+        return None
+
+    if rel_path.parts and rel_path.parts[0] in ('unit', 'integration', 'regression', 'docs', 'demo'):
+        if file_path.suffix == '.py' and file_path.name not in ('__init__.py', 'conftest.py'):
+            return McRFTestFile.from_parent(parent, path=file_path)
+    return None
+
+
+def pytest_ignore_collect(collection_path, config):
+    """Prevent pytest from trying to import test scripts as Python modules."""
+    try:
+        rel_path = collection_path.relative_to(TESTS_DIR)
+        if rel_path.parts and rel_path.parts[0] in ('unit', 'integration', 'regression', 'docs', 'demo'):
+            # Let our custom collector handle these, don't import them
+            return False  # Don't ignore - we'll collect them our way
+    except ValueError:
+        pass
+    return None
+
+
+class McRFTestFile(pytest.File):
+    """Custom test file for McRogueFace scripts."""
+
+    def collect(self):
+        """Yield a single test item for this script."""
+        yield McRFTestItem.from_parent(self, name=self.path.stem)
+
+
+class McRFTestItem(pytest.Item):
+    """Test item that runs a McRogueFace script."""
+
+    def runtest(self):
+        """Run the McRogueFace script."""
+        timeout = self.config.getoption("--mcrf-timeout")
+
+        env = os.environ.copy()
+        existing_ld = env.get('LD_LIBRARY_PATH', '')
+        env['LD_LIBRARY_PATH'] = f"{LIB_DIR}:{existing_ld}" if existing_ld else str(LIB_DIR)
+
+        try:
+            result = subprocess.run(
+                [str(MCROGUEFACE), '--headless', '--exec', str(self.path)],
+                capture_output=True,
+                text=True,
+                timeout=timeout,
+                cwd=str(BUILD_DIR),
+                env=env
+            )
+
+            self.output = result.stdout + result.stderr
+            passed = result.returncode == 0
+
+            if 'FAIL' in self.output and 'PASS' not in self.output.split('FAIL')[-1]:
+                passed = False
+
+            if not passed:
+                raise McRFTestException(self.output)
+
+        except subprocess.TimeoutExpired:
+            self.output = "TIMEOUT"
+            raise McRFTestException("TIMEOUT")
+
+    def repr_failure(self, excinfo):
+        """Format failure output."""
+        if isinstance(excinfo.value, McRFTestException):
+            output = str(excinfo.value)
+            # Show last 10 lines
+            lines = output.strip().split('\n')[-10:]
+            return '\n'.join(lines)
+        return super().repr_failure(excinfo)
+
+    def reportinfo(self):
+        """Report test location."""
+        return self.path, None, f"mcrf:{self.path.relative_to(TESTS_DIR)}"
+
+
+class McRFTestException(Exception):
+    """Exception raised when a McRogueFace test fails."""
+    pass

tests/demo/cookbook_showcase.py

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+#!/usr/bin/env python3
+"""
+Cookbook Screenshot Showcase - Visual examples for cookbook recipes!
+
+Generates beautiful screenshots for cookbook pages.
+Run with: xvfb-run -a ./build/mcrogueface --headless --exec tests/demo/cookbook_showcase.py
+
+In headless mode, automation.screenshot() is SYNCHRONOUS - no timer dance needed!
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+import os
+
+# Output directory - in the docs site images folder
+OUTPUT_DIR = "/opt/goblincorps/repos/mcrogueface.github.io/images/cookbook"
+
+# Tile sprites from the labeled tileset
+TILES = {
+    'player_knight': 84,
+    'player_mage': 85,
+    'player_rogue': 86,
+    'player_warrior': 87,
+    'enemy_slime': 108,
+    'enemy_orc': 120,
+    'enemy_skeleton': 123,
+    'floor_stone': 42,
+    'wall_stone': 30,
+    'wall_brick': 14,
+    'torch': 72,
+    'chest_closed': 89,
+    'item_potion': 113,
+}
+
+
+def screenshot_health_bar():
+    """Create a health bar showcase."""
+    scene = mcrfpy.Scene("health_bar")
+
+    # Dark background
+    bg = mcrfpy.Frame(pos=(0, 0), size=(800, 600))
+    bg.fill_color = mcrfpy.Color(20, 20, 30)
+    scene.children.append(bg)
+
+    # Title
+    title = mcrfpy.Caption(text="Health Bar Recipe", pos=(50, 30))
+    title.fill_color = mcrfpy.Color(255, 255, 255)
+    title.font_size = 28
+    scene.children.append(title)
+
+    subtitle = mcrfpy.Caption(text="Nested frames for dynamic UI elements", pos=(50, 60))
+    subtitle.fill_color = mcrfpy.Color(180, 180, 200)
+    subtitle.font_size = 16
+    scene.children.append(subtitle)
+
+    # Example health bars at different levels
+    y_start = 120
+    bar_configs = [
+        ("Player - Full Health", 100, 100, mcrfpy.Color(50, 200, 50)),
+        ("Player - Damaged", 65, 100, mcrfpy.Color(200, 200, 50)),
+        ("Player - Critical", 20, 100, mcrfpy.Color(200, 50, 50)),
+        ("Boss - 3/4 Health", 750, 1000, mcrfpy.Color(150, 50, 150)),
+    ]
+
+    for i, (label, current, maximum, color) in enumerate(bar_configs):
+        y = y_start + i * 100
+
+        # Label
+        lbl = mcrfpy.Caption(text=label, pos=(50, y))
+        lbl.fill_color = mcrfpy.Color(220, 220, 220)
+        lbl.font_size = 18
+        scene.children.append(lbl)
+
+        # Background bar
+        bar_bg = mcrfpy.Frame(pos=(50, y + 30), size=(400, 30))
+        bar_bg.fill_color = mcrfpy.Color(40, 40, 50)
+        bar_bg.outline = 2
+        bar_bg.outline_color = mcrfpy.Color(80, 80, 100)
+        scene.children.append(bar_bg)
+
+        # Fill bar (scaled to current/maximum)
+        fill_width = int(400 * (current / maximum))
+        bar_fill = mcrfpy.Frame(pos=(50, y + 30), size=(fill_width, 30))
+        bar_fill.fill_color = color
+        scene.children.append(bar_fill)
+
+        # Text overlay
+        hp_text = mcrfpy.Caption(text=f"{current}/{maximum}", pos=(60, y + 35))
+        hp_text.fill_color = mcrfpy.Color(255, 255, 255)
+        hp_text.font_size = 16
+        scene.children.append(hp_text)
+
+    scene.activate()
+    output_path = os.path.join(OUTPUT_DIR, "ui_health_bar.png")
+    automation.screenshot(output_path)
+    print(f"  -> {output_path}")
+
+
+def screenshot_fog_of_war():
+    """Create a fog of war showcase."""
+    scene = mcrfpy.Scene("fog_of_war")
+
+    texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+    grid = mcrfpy.Grid(
+        pos=(50, 80),
+        size=(700, 480),
+        grid_size=(16, 12),
+        texture=texture,
+        zoom=2.8
+    )
+    grid.fill_color = mcrfpy.Color(0, 0, 0)  # Black for unknown areas
+    scene.children.append(grid)
+
+    # Title
+    title = mcrfpy.Caption(text="Fog of War Recipe", pos=(50, 20))
+    title.fill_color = mcrfpy.Color(255, 255, 255)
+    title.font_size = 28
+    scene.children.append(title)
+
+    subtitle = mcrfpy.Caption(text="Visible, discovered, and unknown areas", pos=(50, 50))
+    subtitle.fill_color = mcrfpy.Color(180, 180, 200)
+    subtitle.font_size = 16
+    scene.children.append(subtitle)
+
+    # Fill floor
+    for y in range(12):
+        for x in range(16):
+            grid.at(x, y).tilesprite = TILES['floor_stone']
+
+    # Add walls
+    for x in range(16):
+        grid.at(x, 0).tilesprite = TILES['wall_stone']
+        grid.at(x, 11).tilesprite = TILES['wall_stone']
+    for y in range(12):
+        grid.at(0, y).tilesprite = TILES['wall_stone']
+        grid.at(15, y).tilesprite = TILES['wall_stone']
+
+    # Interior walls (to break LOS)
+    for y in range(3, 8):
+        grid.at(8, y).tilesprite = TILES['wall_brick']
+
+    # Player (mage with light)
+    player = mcrfpy.Entity(grid_pos=(4, 6), texture=texture, sprite_index=TILES['player_mage'])
+    grid.entities.append(player)
+
+    # Hidden enemies on the other side
+    enemy1 = mcrfpy.Entity(grid_pos=(12, 4), texture=texture, sprite_index=TILES['enemy_orc'])
+    grid.entities.append(enemy1)
+    enemy2 = mcrfpy.Entity(grid_pos=(13, 8), texture=texture, sprite_index=TILES['enemy_skeleton'])
+    grid.entities.append(enemy2)
+
+    # Torch in visible area
+    torch = mcrfpy.Entity(grid_pos=(2, 3), texture=texture, sprite_index=TILES['torch'])
+    grid.entities.append(torch)
+
+    grid.center = (4 * 16 + 8, 6 * 16 + 8)
+
+    scene.activate()
+    output_path = os.path.join(OUTPUT_DIR, "grid_fog_of_war.png")
+    automation.screenshot(output_path)
+    print(f"  -> {output_path}")
+
+
+def screenshot_combat_melee():
+    """Create a melee combat showcase."""
+    scene = mcrfpy.Scene("combat_melee")
+
+    texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+    grid = mcrfpy.Grid(
+        pos=(50, 80),
+        size=(700, 480),
+        grid_size=(12, 9),
+        texture=texture,
+        zoom=3.5
+    )
+    grid.fill_color = mcrfpy.Color(20, 20, 30)
+    scene.children.append(grid)
+
+    # Title
+    title = mcrfpy.Caption(text="Melee Combat Recipe", pos=(50, 20))
+    title.fill_color = mcrfpy.Color(255, 255, 255)
+    title.font_size = 28
+    scene.children.append(title)
+
+    subtitle = mcrfpy.Caption(text="Bump-to-attack mechanics with damage calculation", pos=(50, 50))
+    subtitle.fill_color = mcrfpy.Color(180, 180, 200)
+    subtitle.font_size = 16
+    scene.children.append(subtitle)
+
+    # Fill with dirt floor (battle arena feel)
+    for y in range(9):
+        for x in range(12):
+            grid.at(x, y).tilesprite = 50  # dirt
+
+    # Brick walls
+    for x in range(12):
+        grid.at(x, 0).tilesprite = TILES['wall_brick']
+        grid.at(x, 8).tilesprite = TILES['wall_brick']
+    for y in range(9):
+        grid.at(0, y).tilesprite = TILES['wall_brick']
+        grid.at(11, y).tilesprite = TILES['wall_brick']
+
+    # Player knight engaging orc!
+    player = mcrfpy.Entity(grid_pos=(4, 4), texture=texture, sprite_index=TILES['player_knight'])
+    grid.entities.append(player)
+
+    enemy = mcrfpy.Entity(grid_pos=(6, 4), texture=texture, sprite_index=TILES['enemy_orc'])
+    grid.entities.append(enemy)
+
+    # Fallen enemy (bones)
+    bones = mcrfpy.Entity(grid_pos=(8, 6), texture=texture, sprite_index=75)  # bones
+    grid.entities.append(bones)
+
+    # Potion for healing
+    potion = mcrfpy.Entity(grid_pos=(3, 2), texture=texture, sprite_index=TILES['item_potion'])
+    grid.entities.append(potion)
+
+    grid.center = (5 * 16 + 8, 4 * 16 + 8)
+
+    # Combat log UI
+    log_frame = mcrfpy.Frame(pos=(50, 520), size=(700, 60))
+    log_frame.fill_color = mcrfpy.Color(30, 30, 40, 220)
+    log_frame.outline = 1
+    log_frame.outline_color = mcrfpy.Color(60, 60, 80)
+    scene.children.append(log_frame)
+
+    msg1 = mcrfpy.Caption(text="You hit the Orc for 8 damage!", pos=(10, 10))
+    msg1.fill_color = mcrfpy.Color(255, 200, 100)
+    msg1.font_size = 14
+    log_frame.children.append(msg1)
+
+    msg2 = mcrfpy.Caption(text="The Orc hits you for 4 damage!", pos=(10, 30))
+    msg2.fill_color = mcrfpy.Color(255, 100, 100)
+    msg2.font_size = 14
+    log_frame.children.append(msg2)
+
+    scene.activate()
+    output_path = os.path.join(OUTPUT_DIR, "combat_melee.png")
+    automation.screenshot(output_path)
+    print(f"  -> {output_path}")
+
+
+def screenshot_dungeon_generator():
+    """Create a dungeon generator showcase."""
+    scene = mcrfpy.Scene("dungeon_gen")
+
+    texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+    grid = mcrfpy.Grid(
+        pos=(50, 80),
+        size=(700, 480),
+        grid_size=(24, 16),
+        texture=texture,
+        zoom=2.0
+    )
+    grid.fill_color = mcrfpy.Color(10, 10, 15)
+    scene.children.append(grid)
+
+    # Title
+    title = mcrfpy.Caption(text="Dungeon Generator Recipe", pos=(50, 20))
+    title.fill_color = mcrfpy.Color(255, 255, 255)
+    title.font_size = 28
+    scene.children.append(title)
+
+    subtitle = mcrfpy.Caption(text="Procedural rooms connected by corridors", pos=(50, 50))
+    subtitle.fill_color = mcrfpy.Color(180, 180, 200)
+    subtitle.font_size = 16
+    scene.children.append(subtitle)
+
+    # Fill with walls
+    for y in range(16):
+        for x in range(24):
+            grid.at(x, y).tilesprite = TILES['wall_stone']
+
+    # Carve rooms
+    rooms = [
+        (2, 2, 6, 5),    # Room 1
+        (10, 2, 7, 5),   # Room 2
+        (18, 3, 5, 4),   # Room 3
+        (2, 9, 5, 5),    # Room 4
+        (10, 10, 6, 5),  # Room 5
+        (18, 9, 5, 6),   # Room 6
+    ]
+
+    for rx, ry, rw, rh in rooms:
+        for y in range(ry, ry + rh):
+            for x in range(rx, rx + rw):
+                if x < 24 and y < 16:
+                    grid.at(x, y).tilesprite = TILES['floor_stone']
+
+    # Carve corridors (horizontal and vertical)
+    # Room 1 to Room 2
+    for x in range(7, 11):
+        grid.at(x, 4).tilesprite = 50  # dirt corridor
+    # Room 2 to Room 3
+    for x in range(16, 19):
+        grid.at(x, 4).tilesprite = 50
+    # Room 1 to Room 4
+    for y in range(6, 10):
+        grid.at(4, y).tilesprite = 50
+    # Room 2 to Room 5
+    for y in range(6, 11):
+        grid.at(13, y).tilesprite = 50
+    # Room 3 to Room 6
+    for y in range(6, 10):
+        grid.at(20, y).tilesprite = 50
+    # Room 5 to Room 6
+    for x in range(15, 19):
+        grid.at(x, 12).tilesprite = 50
+
+    # Add player in first room
+    player = mcrfpy.Entity(grid_pos=(4, 4), texture=texture, sprite_index=TILES['player_knight'])
+    grid.entities.append(player)
+
+    # Add decorations
+    grid.entities.append(mcrfpy.Entity(grid_pos=(3, 3), texture=texture, sprite_index=TILES['torch']))
+    grid.entities.append(mcrfpy.Entity(grid_pos=(12, 4), texture=texture, sprite_index=TILES['torch']))
+    grid.entities.append(mcrfpy.Entity(grid_pos=(19, 11), texture=texture, sprite_index=TILES['chest_closed']))
+    grid.entities.append(mcrfpy.Entity(grid_pos=(13, 12), texture=texture, sprite_index=TILES['enemy_slime']))
+    grid.entities.append(mcrfpy.Entity(grid_pos=(20, 5), texture=texture, sprite_index=TILES['enemy_skeleton']))
+
+    grid.center = (12 * 16, 8 * 16)
+
+    scene.activate()
+    output_path = os.path.join(OUTPUT_DIR, "grid_dungeon_generator.png")
+    automation.screenshot(output_path)
+    print(f"  -> {output_path}")
+
+
+def screenshot_floating_text():
+    """Create a floating text/damage numbers showcase."""
+    scene = mcrfpy.Scene("floating_text")
+
+    texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+    grid = mcrfpy.Grid(
+        pos=(50, 100),
+        size=(700, 420),
+        grid_size=(12, 8),
+        texture=texture,
+        zoom=3.5
+    )
+    grid.fill_color = mcrfpy.Color(20, 20, 30)
+    scene.children.append(grid)
+
+    # Title
+    title = mcrfpy.Caption(text="Floating Text Recipe", pos=(50, 20))
+    title.fill_color = mcrfpy.Color(255, 255, 255)
+    title.font_size = 28
+    scene.children.append(title)
+
+    subtitle = mcrfpy.Caption(text="Animated damage numbers and status messages", pos=(50, 50))
+    subtitle.fill_color = mcrfpy.Color(180, 180, 200)
+    subtitle.font_size = 16
+    scene.children.append(subtitle)
+
+    # Fill floor
+    for y in range(8):
+        for x in range(12):
+            grid.at(x, y).tilesprite = TILES['floor_stone']
+
+    # Walls
+    for x in range(12):
+        grid.at(x, 0).tilesprite = TILES['wall_stone']
+        grid.at(x, 7).tilesprite = TILES['wall_stone']
+    for y in range(8):
+        grid.at(0, y).tilesprite = TILES['wall_stone']
+        grid.at(11, y).tilesprite = TILES['wall_stone']
+
+    # Player and enemy in combat
+    player = mcrfpy.Entity(grid_pos=(4, 4), texture=texture, sprite_index=TILES['player_warrior'])
+    grid.entities.append(player)
+
+    enemy = mcrfpy.Entity(grid_pos=(7, 4), texture=texture, sprite_index=TILES['enemy_orc'])
+    grid.entities.append(enemy)
+
+    grid.center = (5.5 * 16, 4 * 16)
+
+    # Floating damage numbers (as captions positioned over entities)
+    # These would normally animate upward
+    dmg1 = mcrfpy.Caption(text="-12", pos=(330, 240))
+    dmg1.fill_color = mcrfpy.Color(255, 80, 80)
+    dmg1.font_size = 24
+    scene.children.append(dmg1)
+
+    dmg2 = mcrfpy.Caption(text="-5", pos=(500, 260))
+    dmg2.fill_color = mcrfpy.Color(255, 100, 100)
+    dmg2.font_size = 20
+    scene.children.append(dmg2)
+
+    crit = mcrfpy.Caption(text="CRITICAL!", pos=(280, 200))
+    crit.fill_color = mcrfpy.Color(255, 200, 50)
+    crit.font_size = 18
+    scene.children.append(crit)
+
+    heal = mcrfpy.Caption(text="+8", pos=(320, 280))
+    heal.fill_color = mcrfpy.Color(100, 255, 100)
+    heal.font_size = 20
+    scene.children.append(heal)
+
+    scene.activate()
+    output_path = os.path.join(OUTPUT_DIR, "effects_floating_text.png")
+    automation.screenshot(output_path)
+    print(f"  -> {output_path}")
+
+
+def screenshot_message_log():
+    """Create a message log showcase."""
+    scene = mcrfpy.Scene("message_log")
+
+    # Dark background
+    bg = mcrfpy.Frame(pos=(0, 0), size=(800, 600))
+    bg.fill_color = mcrfpy.Color(20, 20, 30)
+    scene.children.append(bg)
+
+    # Title
+    title = mcrfpy.Caption(text="Message Log Recipe", pos=(50, 30))
+    title.fill_color = mcrfpy.Color(255, 255, 255)
+    title.font_size = 28
+    scene.children.append(title)
+
+    subtitle = mcrfpy.Caption(text="Scrollable combat and event messages", pos=(50, 60))
+    subtitle.fill_color = mcrfpy.Color(180, 180, 200)
+    subtitle.font_size = 16
+    scene.children.append(subtitle)
+
+    # Message log frame
+    log_frame = mcrfpy.Frame(pos=(50, 100), size=(700, 400))
+    log_frame.fill_color = mcrfpy.Color(30, 30, 40)
+    log_frame.outline = 2
+    log_frame.outline_color = mcrfpy.Color(60, 60, 80)
+    scene.children.append(log_frame)
+
+    # Sample messages with colors
+    messages = [
+        ("Welcome to the dungeon!", mcrfpy.Color(200, 200, 255)),
+        ("You see a dark corridor ahead.", mcrfpy.Color(180, 180, 180)),
+        ("A goblin appears!", mcrfpy.Color(255, 200, 100)),
+        ("You hit the Goblin for 8 damage!", mcrfpy.Color(255, 255, 150)),
+        ("The Goblin hits you for 3 damage!", mcrfpy.Color(255, 100, 100)),
+        ("You hit the Goblin for 12 damage! Critical hit!", mcrfpy.Color(255, 200, 50)),
+        ("The Goblin dies!", mcrfpy.Color(150, 255, 150)),
+        ("You found a Healing Potion.", mcrfpy.Color(100, 200, 255)),
+        ("An Orc blocks your path!", mcrfpy.Color(255, 150, 100)),
+        ("You drink the Healing Potion. +15 HP", mcrfpy.Color(100, 255, 100)),
+        ("You hit the Orc for 6 damage!", mcrfpy.Color(255, 255, 150)),
+        ("The Orc hits you for 8 damage!", mcrfpy.Color(255, 100, 100)),
+    ]
+
+    for i, (msg, color) in enumerate(messages):
+        caption = mcrfpy.Caption(text=msg, pos=(15, 15 + i * 30))
+        caption.fill_color = color
+        caption.font_size = 16
+        log_frame.children.append(caption)
+
+    # Scroll indicator
+    scroll = mcrfpy.Caption(text="▼ More messages below", pos=(580, 370))
+    scroll.fill_color = mcrfpy.Color(100, 100, 120)
+    scroll.font_size = 12
+    log_frame.children.append(scroll)
+
+    scene.activate()
+    output_path = os.path.join(OUTPUT_DIR, "ui_message_log.png")
+    automation.screenshot(output_path)
+    print(f"  -> {output_path}")
+
+
+def main():
+    """Generate all cookbook screenshots!"""
+    os.makedirs(OUTPUT_DIR, exist_ok=True)
+
+    print("=== Cookbook Screenshot Showcase ===")
+    print(f"Output: {OUTPUT_DIR}\n")
+
+    showcases = [
+        ('Health Bar UI', screenshot_health_bar),
+        ('Fog of War', screenshot_fog_of_war),
+        ('Melee Combat', screenshot_combat_melee),
+        ('Dungeon Generator', screenshot_dungeon_generator),
+        ('Floating Text', screenshot_floating_text),
+        ('Message Log', screenshot_message_log),
+    ]
+
+    for name, func in showcases:
+        print(f"Generating {name}...")
+        try:
+            func()
+        except Exception as e:
+            print(f"  ERROR: {e}")
+            import traceback
+            traceback.print_exc()
+
+    print("\n=== All cookbook screenshots generated! ===")
+    sys.exit(0)
+
+
+main()

tests/demo/new_features_showcase.py

@@ -0,0 +1,255 @@
+#!/usr/bin/env python3
+"""
+New Features Screenshot Showcase - Alignment + Dijkstra-to-HeightMap
+
+Generates screenshots for the new API cookbook recipes.
+Run with: xvfb-run -a ./build/mcrogueface --headless --exec tests/demo/new_features_showcase.py
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+import os
+
+OUTPUT_DIR = "/opt/goblincorps/repos/mcrogueface.github.io/images/cookbook"
+
+
+def screenshot_alignment():
+    """Create an alignment system showcase."""
+    scene = mcrfpy.Scene("alignment")
+
+    # Dark background
+    bg = mcrfpy.Frame(pos=(0, 0), size=(800, 600))
+    bg.fill_color = mcrfpy.Color(20, 20, 30)
+    scene.children.append(bg)
+
+    # Title
+    title = mcrfpy.Caption(text="UI Alignment System", pos=(50, 20))
+    title.fill_color = mcrfpy.Color(255, 255, 255)
+    title.font_size = 28
+    scene.children.append(title)
+
+    subtitle = mcrfpy.Caption(text="Auto-positioning with reactive resize", pos=(50, 50))
+    subtitle.fill_color = mcrfpy.Color(180, 180, 200)
+    subtitle.font_size = 16
+    scene.children.append(subtitle)
+
+    # Demo container
+    container = mcrfpy.Frame(pos=(100, 100), size=(600, 400))
+    container.fill_color = mcrfpy.Color(40, 40, 50)
+    container.outline = 2
+    container.outline_color = mcrfpy.Color(80, 80, 100)
+    scene.children.append(container)
+
+    # Container label
+    container_label = mcrfpy.Caption(text="Parent Container (600x400)", pos=(10, 10))
+    container_label.fill_color = mcrfpy.Color(100, 100, 120)
+    container_label.font_size = 12
+    container.children.append(container_label)
+
+    # 9 alignment positions demo
+    alignments = [
+        (mcrfpy.Alignment.TOP_LEFT, "TL", mcrfpy.Color(200, 80, 80)),
+        (mcrfpy.Alignment.TOP_CENTER, "TC", mcrfpy.Color(200, 150, 80)),
+        (mcrfpy.Alignment.TOP_RIGHT, "TR", mcrfpy.Color(200, 200, 80)),
+        (mcrfpy.Alignment.CENTER_LEFT, "CL", mcrfpy.Color(80, 200, 80)),
+        (mcrfpy.Alignment.CENTER, "C", mcrfpy.Color(80, 200, 200)),
+        (mcrfpy.Alignment.CENTER_RIGHT, "CR", mcrfpy.Color(80, 80, 200)),
+        (mcrfpy.Alignment.BOTTOM_LEFT, "BL", mcrfpy.Color(150, 80, 200)),
+        (mcrfpy.Alignment.BOTTOM_CENTER, "BC", mcrfpy.Color(200, 80, 200)),
+        (mcrfpy.Alignment.BOTTOM_RIGHT, "BR", mcrfpy.Color(200, 80, 150)),
+    ]
+
+    for align, label, color in alignments:
+        box = mcrfpy.Frame(pos=(0, 0), size=(60, 40))
+        box.fill_color = color
+        box.outline = 1
+        box.outline_color = mcrfpy.Color(255, 255, 255)
+        box.align = align
+        if align != mcrfpy.Alignment.CENTER:
+            box.margin = 15.0
+
+        # Label inside box
+        text = mcrfpy.Caption(text=label, pos=(0, 0))
+        text.fill_color = mcrfpy.Color(255, 255, 255)
+        text.font_size = 16
+        text.align = mcrfpy.Alignment.CENTER
+        box.children.append(text)
+
+        container.children.append(box)
+
+    # Legend
+    legend = mcrfpy.Caption(text="TL=TOP_LEFT  TC=TOP_CENTER  TR=TOP_RIGHT  etc.", pos=(100, 520))
+    legend.fill_color = mcrfpy.Color(150, 150, 170)
+    legend.font_size = 14
+    scene.children.append(legend)
+
+    legend2 = mcrfpy.Caption(text="All boxes have margin=15 except CENTER", pos=(100, 545))
+    legend2.fill_color = mcrfpy.Color(150, 150, 170)
+    legend2.font_size = 14
+    scene.children.append(legend2)
+
+    scene.activate()
+    output_path = os.path.join(OUTPUT_DIR, "ui_alignment.png")
+    automation.screenshot(output_path)
+    print(f"  -> {output_path}")
+
+
+def screenshot_dijkstra_heightmap():
+    """Create a dijkstra-to-heightmap showcase."""
+    scene = mcrfpy.Scene("dijkstra_hmap")
+
+    # Title
+    title = mcrfpy.Caption(text="Dijkstra to HeightMap", pos=(50, 20))
+    title.fill_color = mcrfpy.Color(255, 255, 255)
+    title.font_size = 28
+    scene.children.append(title)
+
+    subtitle = mcrfpy.Caption(text="Distance-based gradients for fog, difficulty, and visualization", pos=(50, 50))
+    subtitle.fill_color = mcrfpy.Color(180, 180, 200)
+    subtitle.font_size = 16
+    scene.children.append(subtitle)
+
+    # Create grid for dijkstra visualization
+    texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+    grid = mcrfpy.Grid(
+        pos=(50, 90),
+        size=(350, 350),
+        grid_size=(16, 16),
+        texture=texture,
+        zoom=1.3
+    )
+    grid.fill_color = mcrfpy.Color(20, 20, 30)
+    scene.children.append(grid)
+
+    # Initialize grid
+    for y in range(16):
+        for x in range(16):
+            grid.at((x, y)).walkable = True
+            grid.at((x, y)).tilesprite = 42  # floor
+
+    # Add some walls
+    for i in range(5, 11):
+        grid.at((i, 5)).walkable = False
+        grid.at((i, 5)).tilesprite = 30  # wall
+        grid.at((5, i)).walkable = False
+        grid.at((5, i)).tilesprite = 30
+
+    # Player at center
+    player = mcrfpy.Entity(grid_pos=(8, 8), texture=texture, sprite_index=84)
+    grid.entities.append(player)
+
+    # Get dijkstra and create color visualization
+    dijkstra = grid.get_dijkstra_map((8, 8))
+    hmap = dijkstra.to_heightmap(unreachable=-1.0)
+
+    # Find max for normalization
+    max_dist = 0
+    for y in range(16):
+        for x in range(16):
+            d = hmap[(x, y)]
+            if d > max_dist and d >= 0:
+                max_dist = d
+
+    # Second visualization panel - color gradient
+    viz_frame = mcrfpy.Frame(pos=(420, 90), size=(350, 350))
+    viz_frame.fill_color = mcrfpy.Color(30, 30, 40)
+    viz_frame.outline = 2
+    viz_frame.outline_color = mcrfpy.Color(60, 60, 80)
+    scene.children.append(viz_frame)
+
+    viz_label = mcrfpy.Caption(text="Distance Visualization", pos=(80, 10))
+    viz_label.fill_color = mcrfpy.Color(200, 200, 220)
+    viz_label.font_size = 16
+    viz_frame.children.append(viz_label)
+
+    # Draw colored squares for each cell
+    cell_size = 20
+    offset_x = 15
+    offset_y = 35
+
+    for y in range(16):
+        for x in range(16):
+            dist = hmap[(x, y)]
+
+            if dist < 0:
+                # Unreachable - dark red
+                color = mcrfpy.Color(60, 0, 0)
+            elif dist == 0:
+                # Source - bright yellow
+                color = mcrfpy.Color(255, 255, 0)
+            else:
+                # Gradient: green (near) to blue (far)
+                t = min(1.0, dist / max_dist)
+                r = 0
+                g = int(200 * (1 - t))
+                b = int(200 * t)
+                color = mcrfpy.Color(r, g, b)
+
+            cell = mcrfpy.Frame(
+                pos=(offset_x + x * cell_size, offset_y + y * cell_size),
+                size=(cell_size - 1, cell_size - 1)
+            )
+            cell.fill_color = color
+            viz_frame.children.append(cell)
+
+    # Legend
+    legend_frame = mcrfpy.Frame(pos=(50, 460), size=(720, 100))
+    legend_frame.fill_color = mcrfpy.Color(30, 30, 40)
+    legend_frame.outline = 1
+    legend_frame.outline_color = mcrfpy.Color(60, 60, 80)
+    scene.children.append(legend_frame)
+
+    leg1 = mcrfpy.Caption(text="Use Cases:", pos=(15, 10))
+    leg1.fill_color = mcrfpy.Color(255, 255, 255)
+    leg1.font_size = 16
+    legend_frame.children.append(leg1)
+
+    uses = [
+        "Distance-based enemy difficulty",
+        "Fog intensity gradients",
+        "Pathfinding visualization",
+        "Influence maps for AI",
+    ]
+    for i, use in enumerate(uses):
+        txt = mcrfpy.Caption(text=f"- {use}", pos=(15 + (i // 2) * 350, 35 + (i % 2) * 25))
+        txt.fill_color = mcrfpy.Color(180, 180, 200)
+        txt.font_size = 14
+        legend_frame.children.append(txt)
+
+    # Color key
+    key_label = mcrfpy.Caption(text="Yellow=Source  Green=Near  Blue=Far  Red=Blocked", pos=(420, 450))
+    key_label.fill_color = mcrfpy.Color(150, 150, 170)
+    key_label.font_size = 12
+    scene.children.append(key_label)
+
+    scene.activate()
+    output_path = os.path.join(OUTPUT_DIR, "grid_dijkstra_heightmap.png")
+    automation.screenshot(output_path)
+    print(f"  -> {output_path}")
+
+
+def main():
+    os.makedirs(OUTPUT_DIR, exist_ok=True)
+
+    print("=== New Features Screenshot Showcase ===")
+    print(f"Output: {OUTPUT_DIR}\n")
+
+    showcases = [
+        ('Alignment System', screenshot_alignment),
+        ('Dijkstra to HeightMap', screenshot_dijkstra_heightmap),
+    ]
+
+    for name, func in showcases:
+        print(f"Generating {name}...")
+        try:
+            func()
+        except Exception as e:
+            print(f"  ERROR: {e}")
+            import traceback
+            traceback.print_exc()
+
+    print("\n=== New feature screenshots generated! ===")
+    sys.exit(0)
+
+
+main()

tests/demo/procgen_showcase.py

@@ -0,0 +1,286 @@
+#!/usr/bin/env python3
+"""Generate screenshots for procgen cookbook recipes.
+
+Uses Frame-based visualization since Grid cell colors use ColorLayer API.
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+
+OUTPUT_DIR = "/opt/goblincorps/repos/mcrogueface.github.io/images/cookbook"
+
+# Simple PRNG
+_seed = 42
+
+def random():
+    global _seed
+    _seed = (_seed * 1103515245 + 12345) & 0x7fffffff
+    return (_seed >> 16) / 32768.0
+
+def seed(n):
+    global _seed
+    _seed = n
+
+def choice(lst):
+    return lst[int(random() * len(lst))]
+
+
+def screenshot_cellular_caves():
+    """Generate cellular automata caves visualization."""
+    print("Generating cellular automata caves...")
+
+    scene = mcrfpy.Scene("caves")
+    scene.activate()
+    mcrfpy.step(0.1)
+
+    # Background
+    bg = mcrfpy.Frame(pos=(0, 0), size=(640, 500))
+    bg.fill_color = mcrfpy.Color(15, 15, 25)
+    scene.children.append(bg)
+
+    width, height = 50, 35
+    cell_size = 12
+    seed(42)
+
+    # Store cell data
+    cells = [[False for _ in range(width)] for _ in range(height)]
+
+    # Step 1: Random noise (45% walls)
+    for y in range(height):
+        for x in range(width):
+            if x == 0 or x == width-1 or y == 0 or y == height-1:
+                cells[y][x] = True  # Border walls
+            else:
+                cells[y][x] = random() < 0.45
+
+    # Step 2: Smooth with cellular automata (5 iterations)
+    for _ in range(5):
+        new_cells = [[cells[y][x] for x in range(width)] for y in range(height)]
+        for y in range(1, height - 1):
+            for x in range(1, width - 1):
+                wall_count = sum(
+                    1 for dy in [-1, 0, 1] for dx in [-1, 0, 1]
+                    if not (dx == 0 and dy == 0) and cells[y + dy][x + dx]
+                )
+                if wall_count >= 5:
+                    new_cells[y][x] = True
+                elif wall_count <= 3:
+                    new_cells[y][x] = False
+        cells = new_cells
+
+    # Find largest connected region
+    visited = set()
+    regions = []
+
+    def flood_fill(start_x, start_y):
+        result = []
+        stack = [(start_x, start_y)]
+        while stack:
+            x, y = stack.pop()
+            if (x, y) in visited or x < 0 or x >= width or y < 0 or y >= height:
+                continue
+            if cells[y][x]:  # Wall
+                continue
+            visited.add((x, y))
+            result.append((x, y))
+            stack.extend([(x+1, y), (x-1, y), (x, y+1), (x, y-1)])
+        return result
+
+    for y in range(height):
+        for x in range(width):
+            if (x, y) not in visited and not cells[y][x]:
+                region = flood_fill(x, y)
+                if region:
+                    regions.append(region)
+
+    largest = max(regions, key=len) if regions else []
+    largest_set = set(largest)
+
+    # Draw cells as colored frames
+    for y in range(height):
+        for x in range(width):
+            px = 20 + x * cell_size
+            py = 20 + y * cell_size
+            cell = mcrfpy.Frame(pos=(px, py), size=(cell_size - 1, cell_size - 1))
+
+            if cells[y][x]:
+                cell.fill_color = mcrfpy.Color(60, 40, 30)  # Wall
+            elif (x, y) in largest_set:
+                cell.fill_color = mcrfpy.Color(50, 90, 100)  # Main cave
+            else:
+                cell.fill_color = mcrfpy.Color(45, 35, 30)  # Filled region
+
+            scene.children.append(cell)
+
+    # Title
+    title = mcrfpy.Caption(text="Cellular Automata Caves", pos=(20, 445))
+    title.fill_color = mcrfpy.Color(200, 200, 200)
+    title.font_size = 18
+    scene.children.append(title)
+
+    subtitle = mcrfpy.Caption(text="45% fill, 5 iterations, largest region preserved", pos=(20, 468))
+    subtitle.fill_color = mcrfpy.Color(130, 130, 140)
+    subtitle.font_size = 12
+    scene.children.append(subtitle)
+
+    mcrfpy.step(0.1)
+    automation.screenshot(OUTPUT_DIR + "/procgen_cellular_caves.png")
+    print("Saved: procgen_cellular_caves.png")
+
+
+def screenshot_wfc():
+    """Generate WFC pattern visualization."""
+    print("Generating WFC patterns...")
+
+    scene = mcrfpy.Scene("wfc")
+    scene.activate()
+    mcrfpy.step(0.1)
+
+    # Background
+    bg = mcrfpy.Frame(pos=(0, 0), size=(640, 500))
+    bg.fill_color = mcrfpy.Color(15, 20, 15)
+    scene.children.append(bg)
+
+    width, height = 40, 28
+    cell_size = 15
+    seed(123)
+
+    GRASS, DIRT, WATER, SAND = 0, 1, 2, 3
+    colors = {
+        GRASS: mcrfpy.Color(60, 120, 50),
+        DIRT: mcrfpy.Color(100, 70, 40),
+        WATER: mcrfpy.Color(40, 80, 140),
+        SAND: mcrfpy.Color(180, 160, 90)
+    }
+
+    rules = {
+        GRASS: {'N': [GRASS, DIRT, SAND], 'S': [GRASS, DIRT, SAND],
+                'E': [GRASS, DIRT, SAND], 'W': [GRASS, DIRT, SAND]},
+        DIRT:  {'N': [GRASS, DIRT], 'S': [GRASS, DIRT],
+                'E': [GRASS, DIRT], 'W': [GRASS, DIRT]},
+        WATER: {'N': [WATER, SAND], 'S': [WATER, SAND],
+                'E': [WATER, SAND], 'W': [WATER, SAND]},
+        SAND:  {'N': [GRASS, WATER, SAND], 'S': [GRASS, WATER, SAND],
+                'E': [GRASS, WATER, SAND], 'W': [GRASS, WATER, SAND]}
+    }
+
+    tiles = set(rules.keys())
+    possibilities = {(x, y): set(tiles) for y in range(height) for x in range(width)}
+    result = {}
+
+    # Seed water lake
+    for x in range(22, 32):
+        for y in range(8, 18):
+            possibilities[(x, y)] = {WATER}
+            result[(x, y)] = WATER
+
+    # Seed dirt path
+    for y in range(10, 18):
+        possibilities[(3, y)] = {DIRT}
+        result[(3, y)] = DIRT
+
+    directions = {'N': (0, -1), 'S': (0, 1), 'E': (1, 0), 'W': (-1, 0)}
+
+    def propagate(sx, sy):
+        stack = [(sx, sy)]
+        while stack:
+            x, y = stack.pop()
+            current = possibilities[(x, y)]
+            for dir_name, (dx, dy) in directions.items():
+                nx, ny = x + dx, y + dy
+                if not (0 <= nx < width and 0 <= ny < height):
+                    continue
+                neighbor = possibilities[(nx, ny)]
+                if len(neighbor) == 1:
+                    continue
+                allowed = set()
+                for tile in current:
+                    if dir_name in rules[tile]:
+                        allowed.update(rules[tile][dir_name])
+                new_opts = neighbor & allowed
+                if new_opts and new_opts != neighbor:
+                    possibilities[(nx, ny)] = new_opts
+                    stack.append((nx, ny))
+
+    # Propagate from seeds
+    for x in range(22, 32):
+        for y in range(8, 18):
+            propagate(x, y)
+    for y in range(10, 18):
+        propagate(3, y)
+
+    # Collapse
+    for _ in range(width * height):
+        best, best_e = None, 1000.0
+        for pos, opts in possibilities.items():
+            if len(opts) > 1:
+                e = len(opts) + random() * 0.1
+                if e < best_e:
+                    best_e, best = e, pos
+
+        if best is None:
+            break
+
+        x, y = best
+        opts = list(possibilities[(x, y)])
+        if not opts:
+            break
+
+        weights = {GRASS: 5, DIRT: 2, WATER: 1, SAND: 2}
+        weighted = []
+        for t in opts:
+            weighted.extend([t] * weights.get(t, 1))
+        chosen = choice(weighted) if weighted else GRASS
+
+        possibilities[(x, y)] = {chosen}
+        result[(x, y)] = chosen
+        propagate(x, y)
+
+    # Fill remaining
+    for y in range(height):
+        for x in range(width):
+            if (x, y) not in result:
+                opts = list(possibilities[(x, y)])
+                result[(x, y)] = choice(opts) if opts else GRASS
+
+    # Draw
+    for y in range(height):
+        for x in range(width):
+            px = 20 + x * cell_size
+            py = 20 + y * cell_size
+            cell = mcrfpy.Frame(pos=(px, py), size=(cell_size - 1, cell_size - 1))
+            cell.fill_color = colors[result[(x, y)]]
+            scene.children.append(cell)
+
+    # Title
+    title = mcrfpy.Caption(text="Wave Function Collapse", pos=(20, 445))
+    title.fill_color = mcrfpy.Color(200, 200, 200)
+    title.font_size = 18
+    scene.children.append(title)
+
+    subtitle = mcrfpy.Caption(text="Constraint-based terrain (seeded lake + path)", pos=(20, 468))
+    subtitle.fill_color = mcrfpy.Color(130, 140, 130)
+    subtitle.font_size = 12
+    scene.children.append(subtitle)
+
+    # Legend
+    for i, (name, tid) in enumerate([("Grass", GRASS), ("Dirt", DIRT), ("Sand", SAND), ("Water", WATER)]):
+        lx, ly = 480, 445 + i * 14
+        swatch = mcrfpy.Frame(pos=(lx, ly), size=(12, 12))
+        swatch.fill_color = colors[tid]
+        scene.children.append(swatch)
+        label = mcrfpy.Caption(text=name, pos=(lx + 16, ly))
+        label.fill_color = mcrfpy.Color(150, 150, 150)
+        label.font_size = 11
+        scene.children.append(label)
+
+    mcrfpy.step(0.1)
+    automation.screenshot(OUTPUT_DIR + "/procgen_wfc.png")
+    print("Saved: procgen_wfc.png")
+
+
+if __name__ == "__main__":
+    screenshot_cellular_caves()
+    screenshot_wfc()
+    print("\nDone!")
+    sys.exit(0)

tests/demo/simple_showcase.py

@@ -0,0 +1,103 @@
+#!/usr/bin/env python3
+"""
+Simple Tutorial Screenshot Generator
+
+This creates ONE screenshot - the part01 tutorial showcase.
+Run with: xvfb-run -a ./build/mcrogueface --headless --exec tests/demo/simple_showcase.py
+
+NOTE: In headless mode, automation.screenshot() is SYNCHRONOUS - it renders
+and captures immediately. No timer dance needed!
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+import os
+
+# Output
+OUTPUT_PATH = "/opt/goblincorps/repos/mcrogueface.github.io/images/tutorials/part_01_grid_movement.png"
+
+# Tile sprites from the labeled tileset
+PLAYER_KNIGHT = 84
+FLOOR_STONE = 42
+WALL_STONE = 30
+TORCH = 72
+BARREL = 73
+SKULL = 74
+
+def main():
+    """Create the part01 showcase screenshot."""
+    # Ensure output dir exists
+    os.makedirs(os.path.dirname(OUTPUT_PATH), exist_ok=True)
+
+    # Create scene
+    scene = mcrfpy.Scene("showcase")
+
+    # Load texture
+    texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+
+    # Create grid - bigger zoom for visibility
+    grid = mcrfpy.Grid(
+        pos=(50, 80),
+        size=(700, 480),
+        grid_size=(12, 9),
+        texture=texture,
+        zoom=3.5
+    )
+    grid.fill_color = mcrfpy.Color(20, 20, 30)
+    scene.children.append(grid)
+
+    # Fill with floor
+    for y in range(9):
+        for x in range(12):
+            grid.at(x, y).tilesprite = FLOOR_STONE
+
+    # Add wall border
+    for x in range(12):
+        grid.at(x, 0).tilesprite = WALL_STONE
+        grid.at(x, 0).walkable = False
+        grid.at(x, 8).tilesprite = WALL_STONE
+        grid.at(x, 8).walkable = False
+    for y in range(9):
+        grid.at(0, y).tilesprite = WALL_STONE
+        grid.at(0, y).walkable = False
+        grid.at(11, y).tilesprite = WALL_STONE
+        grid.at(11, y).walkable = False
+
+    # Add player entity - a knight!
+    player = mcrfpy.Entity(
+        grid_pos=(6, 4),
+        texture=texture,
+        sprite_index=PLAYER_KNIGHT
+    )
+    grid.entities.append(player)
+
+    # Add decorations
+    for pos, sprite in [((2, 2), TORCH), ((9, 2), TORCH), ((2, 6), BARREL), ((9, 6), SKULL)]:
+        entity = mcrfpy.Entity(grid_pos=pos, texture=texture, sprite_index=sprite)
+        grid.entities.append(entity)
+
+    # Center camera on player
+    grid.center = (6 * 16 + 8, 4 * 16 + 8)
+
+    # Add title
+    title = mcrfpy.Caption(text="Part 1: The '@' and the Dungeon Grid", pos=(50, 20))
+    title.fill_color = mcrfpy.Color(255, 255, 255)
+    title.font_size = 28
+    scene.children.append(title)
+
+    subtitle = mcrfpy.Caption(text="Creating a grid, placing entities, handling input", pos=(50, 50))
+    subtitle.fill_color = mcrfpy.Color(180, 180, 200)
+    subtitle.font_size = 16
+    scene.children.append(subtitle)
+
+    # Activate scene
+    scene.activate()
+
+    # In headless mode, screenshot() is synchronous - renders then captures!
+    result = automation.screenshot(OUTPUT_PATH)
+    print(f"Screenshot saved: {OUTPUT_PATH} (result: {result})")
+    sys.exit(0)
+
+
+# Run it
+main()

tests/demo/tutorial_screenshots.py

@@ -0,0 +1,169 @@
+#!/usr/bin/env python3
+"""
+Tutorial Screenshot Generator
+
+Usage:
+    ./mcrogueface --headless --exec tests/demo/tutorial_screenshots.py
+
+Extracts code from tutorial markdown files and generates screenshots.
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+import os
+import re
+
+# Paths
+DOCS_REPO = "/opt/goblincorps/repos/mcrogueface.github.io"
+TUTORIAL_DIR = os.path.join(DOCS_REPO, "tutorial")
+OUTPUT_DIR = os.path.join(DOCS_REPO, "images", "tutorials")
+
+# Tutorials to process (in order)
+TUTORIALS = [
+    "part_01_grid_movement.md",
+    "part_02_tiles_collision.md",
+    "part_03_dungeon_generation.md",
+    "part_04_fov.md",
+    "part_05_enemies.md",
+    "part_06_combat.md",
+    "part_07_ui.md",
+]
+
+
+def extract_code_from_markdown(filepath):
+    """Extract the main Python code block from a tutorial markdown file."""
+    with open(filepath, 'r') as f:
+        content = f.read()
+
+    # Find code blocks after "## The Complete Code" header
+    # Look for the first python code block after that header
+    complete_code_match = re.search(
+        r'##\s+The Complete Code.*?```python\s*\n(.*?)```',
+        content,
+        re.DOTALL | re.IGNORECASE
+    )
+
+    if complete_code_match:
+        return complete_code_match.group(1)
+
+    # Fallback: just get the first large python code block
+    code_blocks = re.findall(r'```python\s*\n(.*?)```', content, re.DOTALL)
+    if code_blocks:
+        # Return the largest code block (likely the main example)
+        return max(code_blocks, key=len)
+
+    return None
+
+
+def add_screenshot_hook(code, screenshot_path):
+    """Add screenshot capture code to the end of the script."""
+    # Add code to take screenshot after a brief delay
+    hook_code = f'''
+
+# === Screenshot capture hook (added by tutorial_screenshots.py) ===
+import mcrfpy
+from mcrfpy import automation
+import sys
+
+_screenshot_taken = [False]
+
+def _take_screenshot(timer, runtime):
+    if not _screenshot_taken[0]:
+        _screenshot_taken[0] = True
+        automation.screenshot("{screenshot_path}")
+        print(f"Screenshot saved: {screenshot_path}")
+        sys.exit(0)
+
+# Wait a moment for scene to render, then capture
+mcrfpy.Timer("_screenshot_hook", _take_screenshot, 200)
+'''
+    return code + hook_code
+
+
+class TutorialScreenshotter:
+    """Manages tutorial screenshot generation."""
+
+    def __init__(self):
+        self.tutorials = []
+        self.current_index = 0
+
+    def load_tutorials(self):
+        """Load and parse all tutorial files."""
+        for filename in TUTORIALS:
+            filepath = os.path.join(TUTORIAL_DIR, filename)
+            if not os.path.exists(filepath):
+                print(f"Warning: {filepath} not found, skipping")
+                continue
+
+            code = extract_code_from_markdown(filepath)
+            if code:
+                # Generate output filename
+                base = os.path.splitext(filename)[0]
+                screenshot_name = f"{base}.png"
+                self.tutorials.append({
+                    'name': filename,
+                    'code': code,
+                    'screenshot': screenshot_name,
+                    'filepath': filepath,
+                })
+                print(f"Loaded: {filename}")
+            else:
+                print(f"Warning: No code found in {filename}")
+
+    def run(self):
+        """Generate all screenshots."""
+        # Ensure output directory exists
+        os.makedirs(OUTPUT_DIR, exist_ok=True)
+
+        print(f"\nGenerating {len(self.tutorials)} tutorial screenshots...")
+        print(f"Output directory: {OUTPUT_DIR}\n")
+
+        self.process_next()
+
+    def process_next(self):
+        """Process the next tutorial."""
+        if self.current_index >= len(self.tutorials):
+            print("\nAll screenshots generated!")
+            sys.exit(0)
+            return
+
+        tutorial = self.tutorials[self.current_index]
+        print(f"[{self.current_index + 1}/{len(self.tutorials)}] Processing {tutorial['name']}...")
+
+        # Add screenshot hook to the code
+        screenshot_path = os.path.join(OUTPUT_DIR, tutorial['screenshot'])
+        modified_code = add_screenshot_hook(tutorial['code'], screenshot_path)
+
+        # Write to temp file and execute
+        temp_path = f"/tmp/tutorial_screenshot_{self.current_index}.py"
+        with open(temp_path, 'w') as f:
+            f.write(modified_code)
+
+        try:
+            # Execute the code
+            exec(compile(modified_code, temp_path, 'exec'), {'__name__': '__main__'})
+        except Exception as e:
+            print(f"Error processing {tutorial['name']}: {e}")
+            self.current_index += 1
+            self.process_next()
+        finally:
+            try:
+                os.unlink(temp_path)
+            except:
+                pass
+
+
+def main():
+    """Main entry point."""
+    screenshotter = TutorialScreenshotter()
+    screenshotter.load_tutorials()
+
+    if not screenshotter.tutorials:
+        print("No tutorials found to process!")
+        sys.exit(1)
+
+    screenshotter.run()
+
+
+# Run when executed
+main()

tests/demo/tutorial_showcase.py

@@ -0,0 +1,426 @@
+#!/usr/bin/env python3
+"""
+Tutorial Screenshot Showcase - ALL THE SCREENSHOTS!
+
+Generates beautiful screenshots for all tutorial parts.
+Run with: xvfb-run -a ./build/mcrogueface --headless --exec tests/demo/tutorial_showcase.py
+
+In headless mode, automation.screenshot() is SYNCHRONOUS - no timer dance needed!
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+import os
+
+# Output directory
+OUTPUT_DIR = "/opt/goblincorps/repos/mcrogueface.github.io/images/tutorials"
+
+# Tile meanings from the labeled tileset - the FUN sprites!
+TILES = {
+    # Players - knights and heroes!
+    'player_knight': 84,
+    'player_mage': 85,
+    'player_rogue': 86,
+    'player_warrior': 87,
+    'player_archer': 88,
+    'player_alt1': 96,
+    'player_alt2': 97,
+    'player_alt3': 98,
+
+    # Enemies - scary!
+    'enemy_slime': 108,
+    'enemy_bat': 109,
+    'enemy_spider': 110,
+    'enemy_rat': 111,
+    'enemy_orc': 120,
+    'enemy_troll': 121,
+    'enemy_ghost': 122,
+    'enemy_skeleton': 123,
+    'enemy_demon': 124,
+    'enemy_boss': 92,
+
+    # Terrain
+    'floor_stone': 42,
+    'floor_wood': 49,
+    'floor_grass': 48,
+    'floor_dirt': 50,
+    'wall_stone': 30,
+    'wall_brick': 14,
+    'wall_mossy': 28,
+
+    # Items
+    'item_potion': 113,
+    'item_scroll': 114,
+    'item_key': 115,
+    'item_coin': 116,
+
+    # Equipment
+    'equip_sword': 101,
+    'equip_shield': 102,
+    'equip_helm': 103,
+    'equip_armor': 104,
+
+    # Chests and doors
+    'chest_closed': 89,
+    'chest_open': 90,
+    'door_closed': 33,
+    'door_open': 35,
+
+    # Decorations
+    'torch': 72,
+    'barrel': 73,
+    'skull': 74,
+    'bones': 75,
+}
+
+
+class TutorialShowcase:
+    """Creates beautiful showcase screenshots for tutorials."""
+
+    def __init__(self, scene_name, output_name):
+        self.scene = mcrfpy.Scene(scene_name)
+        self.output_path = os.path.join(OUTPUT_DIR, output_name)
+        self.grid = None
+
+    def setup_grid(self, width, height, zoom=3.0):
+        """Create a grid with nice defaults."""
+        texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+        self.grid = mcrfpy.Grid(
+            pos=(50, 80),
+            size=(700, 500),
+            grid_size=(width, height),
+            texture=texture,
+            zoom=zoom
+        )
+        self.grid.fill_color = mcrfpy.Color(20, 20, 30)
+        self.scene.children.append(self.grid)
+        self.texture = texture
+        return self.grid
+
+    def add_title(self, text, subtitle=None):
+        """Add a title to the scene."""
+        title = mcrfpy.Caption(text=text, pos=(50, 20))
+        title.fill_color = mcrfpy.Color(255, 255, 255)
+        title.font_size = 28
+        self.scene.children.append(title)
+
+        if subtitle:
+            sub = mcrfpy.Caption(text=subtitle, pos=(50, 50))
+            sub.fill_color = mcrfpy.Color(180, 180, 200)
+            sub.font_size = 16
+            self.scene.children.append(sub)
+
+    def fill_floor(self, tile=None):
+        """Fill grid with floor tiles."""
+        if tile is None:
+            tile = TILES['floor_stone']
+        w, h = int(self.grid.grid_size[0]), int(self.grid.grid_size[1])
+        for y in range(h):
+            for x in range(w):
+                self.grid.at(x, y).tilesprite = tile
+
+    def add_walls(self, tile=None):
+        """Add wall border."""
+        if tile is None:
+            tile = TILES['wall_stone']
+        w, h = int(self.grid.grid_size[0]), int(self.grid.grid_size[1])
+        for x in range(w):
+            self.grid.at(x, 0).tilesprite = tile
+            self.grid.at(x, 0).walkable = False
+            self.grid.at(x, h-1).tilesprite = tile
+            self.grid.at(x, h-1).walkable = False
+        for y in range(h):
+            self.grid.at(0, y).tilesprite = tile
+            self.grid.at(0, y).walkable = False
+            self.grid.at(w-1, y).tilesprite = tile
+            self.grid.at(w-1, y).walkable = False
+
+    def add_entity(self, x, y, sprite):
+        """Add an entity to the grid."""
+        entity = mcrfpy.Entity(
+            grid_pos=(x, y),
+            texture=self.texture,
+            sprite_index=sprite
+        )
+        self.grid.entities.append(entity)
+        return entity
+
+    def center_on(self, x, y):
+        """Center camera on a position."""
+        self.grid.center = (x * 16 + 8, y * 16 + 8)
+
+    def screenshot(self):
+        """Take the screenshot - synchronous in headless mode!"""
+        self.scene.activate()
+        result = automation.screenshot(self.output_path)
+        print(f"  -> {self.output_path} (result: {result})")
+        return result
+
+
+def part01_grid_movement():
+    """Part 1: Grid Movement - Knight in a dungeon room."""
+    showcase = TutorialShowcase("part01", "part_01_grid_movement.png")
+    showcase.setup_grid(12, 9, zoom=3.5)
+    showcase.add_title("Part 1: The '@' and the Dungeon Grid",
+                       "Creating a grid, placing entities, handling input")
+
+    showcase.fill_floor(TILES['floor_stone'])
+    showcase.add_walls(TILES['wall_stone'])
+
+    # Add the player (a cool knight, not boring @)
+    showcase.add_entity(6, 4, TILES['player_knight'])
+
+    # Add some decorations to make it interesting
+    showcase.add_entity(2, 2, TILES['torch'])
+    showcase.add_entity(9, 2, TILES['torch'])
+    showcase.add_entity(2, 6, TILES['barrel'])
+    showcase.add_entity(9, 6, TILES['skull'])
+
+    showcase.center_on(6, 4)
+    showcase.screenshot()
+
+
+def part02_tiles_collision():
+    """Part 2: Tiles and Collision - Walls and walkability."""
+    showcase = TutorialShowcase("part02", "part_02_tiles_collision.png")
+    showcase.setup_grid(14, 10, zoom=3.0)
+    showcase.add_title("Part 2: Tiles, Collision, and Walkability",
+                       "Different tile types and blocking movement")
+
+    showcase.fill_floor(TILES['floor_stone'])
+    showcase.add_walls(TILES['wall_brick'])
+
+    # Create some interior walls to show collision
+    for y in range(2, 5):
+        showcase.grid.at(5, y).tilesprite = TILES['wall_stone']
+        showcase.grid.at(5, y).walkable = False
+    for y in range(5, 8):
+        showcase.grid.at(9, y).tilesprite = TILES['wall_stone']
+        showcase.grid.at(9, y).walkable = False
+
+    # Add a door
+    showcase.grid.at(5, 5).tilesprite = TILES['door_closed']
+    showcase.grid.at(5, 5).walkable = False
+
+    # Player navigating the maze
+    showcase.add_entity(3, 4, TILES['player_warrior'])
+
+    # Chest as goal
+    showcase.add_entity(11, 5, TILES['chest_closed'])
+
+    showcase.center_on(7, 5)
+    showcase.screenshot()
+
+
+def part03_dungeon_generation():
+    """Part 3: Dungeon Generation - Procedural rooms and corridors."""
+    showcase = TutorialShowcase("part03", "part_03_dungeon_generation.png")
+    showcase.setup_grid(20, 14, zoom=2.5)
+    showcase.add_title("Part 3: Procedural Dungeon Generation",
+                       "Random rooms connected by corridors")
+
+    # Fill with walls first
+    for y in range(14):
+        for x in range(20):
+            showcase.grid.at(x, y).tilesprite = TILES['wall_stone']
+            showcase.grid.at(x, y).walkable = False
+
+    # Carve out two rooms
+    # Room 1 (left)
+    for y in range(3, 8):
+        for x in range(2, 8):
+            showcase.grid.at(x, y).tilesprite = TILES['floor_stone']
+            showcase.grid.at(x, y).walkable = True
+
+    # Room 2 (right)
+    for y in range(6, 12):
+        for x in range(12, 18):
+            showcase.grid.at(x, y).tilesprite = TILES['floor_stone']
+            showcase.grid.at(x, y).walkable = True
+
+    # Corridor connecting them
+    for x in range(7, 13):
+        showcase.grid.at(x, 6).tilesprite = TILES['floor_dirt']
+        showcase.grid.at(x, 6).walkable = True
+    for y in range(6, 9):
+        showcase.grid.at(12, y).tilesprite = TILES['floor_dirt']
+        showcase.grid.at(12, y).walkable = True
+
+    # Player in first room
+    showcase.add_entity(4, 5, TILES['player_knight'])
+
+    # Some loot in second room
+    showcase.add_entity(14, 9, TILES['chest_closed'])
+    showcase.add_entity(16, 8, TILES['item_potion'])
+
+    # Torches
+    showcase.add_entity(3, 3, TILES['torch'])
+    showcase.add_entity(6, 3, TILES['torch'])
+    showcase.add_entity(13, 7, TILES['torch'])
+
+    showcase.center_on(10, 7)
+    showcase.screenshot()
+
+
+def part04_fov():
+    """Part 4: Field of View - Showing explored vs visible areas."""
+    showcase = TutorialShowcase("part04", "part_04_fov.png")
+    showcase.setup_grid(16, 12, zoom=2.8)
+    showcase.add_title("Part 4: Field of View and Fog of War",
+                       "What the player can see vs. the unknown")
+
+    showcase.fill_floor(TILES['floor_stone'])
+    showcase.add_walls(TILES['wall_brick'])
+
+    # Some interior pillars to block sight
+    for pos in [(5, 4), (5, 7), (10, 5), (10, 8)]:
+        showcase.grid.at(pos[0], pos[1]).tilesprite = TILES['wall_mossy']
+        showcase.grid.at(pos[0], pos[1]).walkable = False
+
+    # Player with "light"
+    showcase.add_entity(8, 6, TILES['player_mage'])
+
+    # Hidden enemy (player wouldn't see this!)
+    showcase.add_entity(12, 3, TILES['enemy_ghost'])
+
+    # Visible enemies
+    showcase.add_entity(3, 5, TILES['enemy_bat'])
+    showcase.add_entity(6, 8, TILES['enemy_spider'])
+
+    showcase.center_on(8, 6)
+    showcase.screenshot()
+
+
+def part05_enemies():
+    """Part 5: Enemies - A dungeon full of monsters."""
+    showcase = TutorialShowcase("part05", "part_05_enemies.png")
+    showcase.setup_grid(18, 12, zoom=2.5)
+    showcase.add_title("Part 5: Adding Enemies",
+                       "Different monster types with AI behavior")
+
+    showcase.fill_floor(TILES['floor_stone'])
+    showcase.add_walls(TILES['wall_stone'])
+
+    # The hero
+    showcase.add_entity(3, 5, TILES['player_warrior'])
+
+    # A variety of enemies
+    showcase.add_entity(7, 3, TILES['enemy_slime'])
+    showcase.add_entity(10, 6, TILES['enemy_bat'])
+    showcase.add_entity(8, 8, TILES['enemy_spider'])
+    showcase.add_entity(14, 4, TILES['enemy_orc'])
+    showcase.add_entity(15, 8, TILES['enemy_skeleton'])
+    showcase.add_entity(12, 5, TILES['enemy_rat'])
+
+    # Boss at the end
+    showcase.add_entity(15, 6, TILES['enemy_boss'])
+
+    # Some decorations
+    showcase.add_entity(5, 2, TILES['bones'])
+    showcase.add_entity(13, 9, TILES['skull'])
+    showcase.add_entity(2, 8, TILES['torch'])
+    showcase.add_entity(16, 2, TILES['torch'])
+
+    showcase.center_on(9, 5)
+    showcase.screenshot()
+
+
+def part06_combat():
+    """Part 6: Combat - Battle in progress!"""
+    showcase = TutorialShowcase("part06", "part_06_combat.png")
+    showcase.setup_grid(14, 10, zoom=3.0)
+    showcase.add_title("Part 6: Combat System",
+                       "HP, attack, defense, and turn-based fighting")
+
+    showcase.fill_floor(TILES['floor_dirt'])
+    showcase.add_walls(TILES['wall_brick'])
+
+    # Battle scene - player vs enemy
+    showcase.add_entity(5, 5, TILES['player_knight'])
+    showcase.add_entity(8, 5, TILES['enemy_orc'])
+
+    # Fallen enemies (show combat has happened)
+    showcase.add_entity(4, 3, TILES['bones'])
+    showcase.add_entity(9, 7, TILES['skull'])
+
+    # Equipment the player has
+    showcase.add_entity(3, 6, TILES['equip_shield'])
+    showcase.add_entity(10, 4, TILES['item_potion'])
+
+    showcase.center_on(6, 5)
+    showcase.screenshot()
+
+
+def part07_ui():
+    """Part 7: User Interface - Health bars and menus."""
+    showcase = TutorialShowcase("part07", "part_07_ui.png")
+    showcase.setup_grid(12, 8, zoom=3.0)
+    showcase.add_title("Part 7: User Interface",
+                       "Health bars, message logs, and menus")
+
+    showcase.fill_floor(TILES['floor_wood'])
+    showcase.add_walls(TILES['wall_brick'])
+
+    # Player
+    showcase.add_entity(6, 4, TILES['player_rogue'])
+
+    # Some items to interact with
+    showcase.add_entity(4, 3, TILES['chest_open'])
+    showcase.add_entity(8, 5, TILES['item_coin'])
+
+    # Add UI overlay example - health bar frame
+    ui_frame = mcrfpy.Frame(pos=(50, 520), size=(200, 40))
+    ui_frame.fill_color = mcrfpy.Color(40, 40, 50, 200)
+    ui_frame.outline = 2
+    ui_frame.outline_color = mcrfpy.Color(80, 80, 100)
+    showcase.scene.children.append(ui_frame)
+
+    # Health label
+    hp_label = mcrfpy.Caption(text="HP: 45/50", pos=(10, 10))
+    hp_label.fill_color = mcrfpy.Color(255, 100, 100)
+    hp_label.font_size = 18
+    ui_frame.children.append(hp_label)
+
+    # Health bar background
+    hp_bg = mcrfpy.Frame(pos=(90, 12), size=(100, 16))
+    hp_bg.fill_color = mcrfpy.Color(60, 20, 20)
+    ui_frame.children.append(hp_bg)
+
+    # Health bar fill
+    hp_fill = mcrfpy.Frame(pos=(90, 12), size=(90, 16))  # 90% health
+    hp_fill.fill_color = mcrfpy.Color(200, 50, 50)
+    ui_frame.children.append(hp_fill)
+
+    showcase.center_on(6, 4)
+    showcase.screenshot()
+
+
+def main():
+    """Generate all showcase screenshots!"""
+    os.makedirs(OUTPUT_DIR, exist_ok=True)
+
+    print("=== Tutorial Screenshot Showcase ===")
+    print(f"Output: {OUTPUT_DIR}\n")
+
+    showcases = [
+        ('Part 1: Grid Movement', part01_grid_movement),
+        ('Part 2: Tiles & Collision', part02_tiles_collision),
+        ('Part 3: Dungeon Generation', part03_dungeon_generation),
+        ('Part 4: Field of View', part04_fov),
+        ('Part 5: Enemies', part05_enemies),
+        ('Part 6: Combat', part06_combat),
+        ('Part 7: UI', part07_ui),
+    ]
+
+    for name, func in showcases:
+        print(f"Generating {name}...")
+        try:
+            func()
+        except Exception as e:
+            print(f"  ERROR: {e}")
+
+    print("\n=== All screenshots generated! ===")
+    sys.exit(0)
+
+
+main()

tests/docs/API_FINDINGS.md

@@ -0,0 +1,129 @@
+# McRogueFace API Test Findings
+*Generated by Frack, January 14, 2026*
+
+## Summary
+
+Tested code snippets from docs site against actual runtime API.
+Tests created in `/tests/docs/` with screenshots in `/tests/docs/screenshots/`.
+
+---
+
+## Entity Constructor
+
+**Correct:**
+```python
+entity = mcrfpy.Entity(grid_pos=(10, 7), texture=texture, sprite_index=84)
+```
+
+**Wrong:**
+```python
+entity = mcrfpy.Entity(pos=(10, 7), ...)  # FAILS - no 'pos' kwarg
+entity = mcrfpy.Entity(grid_x=10, grid_y=7, ...)  # FAILS - no separate kwargs
+```
+
+---
+
+## Scene API
+
+**Modern (WORKS):**
+```python
+scene = mcrfpy.Scene("name")
+scene.children.append(frame)
+scene.on_key = handler
+scene.activate()
+```
+
+**Deprecated → Modern:**
+```python
+# OLD                          → NEW
+mcrfpy.createScene("name")     → scene = mcrfpy.Scene("name")
+mcrfpy.sceneUI("name")         → scene.children
+mcrfpy.setScene("name")        → scene.activate()
+mcrfpy.keypressScene(fn)       → scene.on_key = fn
+mcrfpy.currentScene()          → mcrfpy.current_scene  # property, not function!
+```
+
+---
+
+## Grid.at() Signature
+
+Both work:
+```python
+point = grid.at((x, y))  # Tuple - documented
+point = grid.at(x, y)    # Separate args - also works!
+```
+
+---
+
+## Animation System
+
+**Works:**
+- `x`, `y`, `w`, `h` properties animate correctly
+- Callbacks fire as expected
+- Multiple simultaneous animations work
+- Easing functions work
+
+**Does NOT work:**
+- `opacity` - property exists, can set directly, but animation ignores it
+
+---
+
+## Timer API
+
+**Modern:**
+```python
+timer = mcrfpy.Timer("name", callback, seconds)
+# Callback signature: def callback(timer, runtime):
+```
+
+**Deprecated:**
+```python
+mcrfpy.setTimer("name", callback, milliseconds)  # Wrong signature too
+```
+
+---
+
+## Color API
+
+Always use `mcrfpy.Color()`:
+```python
+frame.fill_color = mcrfpy.Color(255, 0, 0)     # CORRECT
+frame.fill_color = mcrfpy.Color(255, 0, 0, 128)  # With alpha
+```
+
+Tuples no longer work:
+```python
+frame.fill_color = (255, 0, 0)  # FAILS
+```
+
+---
+
+## Available Globals
+
+**All exist:**
+- `mcrfpy.default_texture` - Texture for kenney_tinydungeon.png
+- `mcrfpy.default_font` - Font for JetBrains Mono
+- `mcrfpy.default_fov` - (default FOV settings)
+
+---
+
+## Files Requiring Updates
+
+1. `quickstart.md` - All 4 code blocks use deprecated API
+2. `features/scenes.md` - "Procedural API" section entirely deprecated
+3. `features/animation.md` - opacity examples don't work
+4. Any file using `setTimer`, `createScene`, `sceneUI`, `setScene`, `keypressScene`
+
+---
+
+## Test Files Created
+
+| Test | Status | Notes |
+|------|--------|-------|
+| test_quickstart_simple_scene.py | PASS | |
+| test_quickstart_main_menu.py | PASS | |
+| test_quickstart_entities.py | PASS | Uses grid_pos= |
+| test_quickstart_sprites.py | PASS | |
+| test_features_animation.py | PASS | opacity test skipped |
+| test_features_scenes.py | PASS | Documents deprecated API |
+| test_entity_api.py | INFO | Verifies grid_pos= works |

tests/docs/test_current_scene.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+"""Verify mcrfpy.current_scene property."""
+import mcrfpy
+import sys
+
+scene = mcrfpy.Scene("test")
+scene.activate()
+mcrfpy.step(0.1)
+
+try:
+    current = mcrfpy.current_scene
+    print(f"mcrfpy.current_scene = {current}")
+    print(f"type: {type(current)}")
+    print("VERIFIED: mcrfpy.current_scene WORKS")
+except AttributeError as e:
+    print(f"FAILED: {e}")
+
+sys.exit(0)

tests/docs/test_defaults.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+"""Test mcrfpy default resources."""
+import mcrfpy
+import sys
+
+scene = mcrfpy.Scene("test")
+scene.activate()
+mcrfpy.step(0.01)
+
+print("Checking mcrfpy defaults:")
+
+try:
+    dt = mcrfpy.default_texture
+    print(f"  default_texture = {dt}")
+except AttributeError as e:
+    print(f"  default_texture: NOT FOUND")
+
+try:
+    df = mcrfpy.default_font
+    print(f"  default_font = {df}")
+except AttributeError as e:
+    print(f"  default_font: NOT FOUND")
+
+# Also check what other module-level attributes exist
+print("\nAll mcrfpy attributes starting with 'default':")
+for attr in dir(mcrfpy):
+    if 'default' in attr.lower():
+        print(f"  {attr}")
+
+sys.exit(0)

tests/docs/test_entity_api.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+"""Quick test to verify Entity constructor signature."""
+import mcrfpy
+import sys
+
+scene = mcrfpy.Scene("test")
+scene.activate()
+mcrfpy.step(0.01)
+
+texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+grid = mcrfpy.Grid(grid_size=(20, 15), texture=texture, pos=(10, 10), size=(640, 480))
+scene.children.append(grid)
+
+# Test grid_pos vs grid_x/grid_y
+try:
+    e1 = mcrfpy.Entity(grid_pos=(5, 5), texture=texture, sprite_index=85)
+    grid.entities.append(e1)
+    print("grid_pos= WORKS")
+except TypeError as e:
+    print(f"grid_pos= FAILS: {e}")
+
+try:
+    e2 = mcrfpy.Entity(grid_x=7, grid_y=7, texture=texture, sprite_index=85)
+    grid.entities.append(e2)
+    print("grid_x=/grid_y= WORKS")
+except TypeError as e:
+    print(f"grid_x=/grid_y= FAILS: {e}")
+
+print("Entity API test complete")
+sys.exit(0)

tests/docs/test_features_animation.py

@@ -0,0 +1,86 @@
+#!/usr/bin/env python3
+"""Test for features/animation.md examples.
+
+Tests the modern API equivalents of animation examples.
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+
+# Setup scene using modern API
+scene = mcrfpy.Scene("animation_demo")
+scene.activate()
+mcrfpy.step(0.01)
+
+# Test 1: Basic Animation (lines 9-19)
+frame = mcrfpy.Frame(pos=(0, 0), size=(100, 100))
+frame.fill_color = mcrfpy.Color(255, 0, 0)
+scene.children.append(frame)
+
+# Animate x position
+anim = mcrfpy.Animation("x", 500.0, 2.0, "easeInOut")
+anim.start(frame)
+print("Test 1: Basic animation started")
+
+# Step forward to run animation
+mcrfpy.step(2.5)
+
+# Verify animation completed
+if abs(frame.x - 500.0) < 1.0:
+    print("Test 1: PASS - frame moved to x=500")
+else:
+    print(f"Test 1: FAIL - frame at x={frame.x}, expected 500")
+    sys.exit(1)
+
+# Test 2: Multiple simultaneous animations (lines 134-144)
+frame2 = mcrfpy.Frame(pos=(0, 0), size=(100, 100))
+frame2.fill_color = mcrfpy.Color(0, 255, 0)
+scene.children.append(frame2)
+
+mcrfpy.Animation("x", 200.0, 1.0, "easeInOut").start(frame2)
+mcrfpy.Animation("y", 150.0, 1.0, "easeInOut").start(frame2)
+mcrfpy.Animation("w", 300.0, 1.0, "easeInOut").start(frame2)
+mcrfpy.Animation("h", 200.0, 1.0, "easeInOut").start(frame2)
+
+mcrfpy.step(1.5)
+
+if abs(frame2.x - 200.0) < 1.0 and abs(frame2.y - 150.0) < 1.0:
+    print("Test 2: PASS - multiple animations completed")
+else:
+    print(f"Test 2: FAIL - frame2 at ({frame2.x}, {frame2.y})")
+    sys.exit(1)
+
+# Test 3: Callback (lines 105-112)
+callback_fired = False
+
+def on_complete(animation, target):
+    global callback_fired
+    callback_fired = True
+    print("Test 3: Callback fired!")
+
+frame3 = mcrfpy.Frame(pos=(0, 300), size=(50, 50))
+frame3.fill_color = mcrfpy.Color(0, 0, 255)
+scene.children.append(frame3)
+
+anim3 = mcrfpy.Animation("x", 300.0, 0.5, "easeInOut", callback=on_complete)
+anim3.start(frame3)
+
+mcrfpy.step(1.0)
+
+if callback_fired:
+    print("Test 3: PASS - callback executed")
+else:
+    print("Test 3: FAIL - callback not executed")
+    sys.exit(1)
+
+# Test 4: NOTE - Opacity animation documented in features/animation.md
+# but DOES NOT WORK on Frame. The property exists but animation
+# system doesn't animate it. This is a DOCS BUG to report.
+# Skipping test 4 - opacity animation not supported.
+print("Test 4: SKIPPED - opacity animation not supported on Frame (docs bug)")
+
+# Take screenshot showing animation results
+automation.screenshot("/opt/goblincorps/repos/McRogueFace/tests/docs/screenshots/features_animation.png")
+
+print("\nAll animation tests PASS")
+sys.exit(0)

tests/docs/test_features_scenes.py

@@ -0,0 +1,84 @@
+#!/usr/bin/env python3
+"""Test for features/scenes.md examples.
+
+Tests both modern and procedural APIs from the docs.
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+
+# Test 1: Modern Scene API (lines 28-42)
+print("Test 1: Modern Scene API")
+scene = mcrfpy.Scene("test_modern")
+scene.children.append(mcrfpy.Frame(pos=(0, 0), size=(800, 600)))
+
+def my_handler(key, action):
+    if action == "start":
+        print(f"  Key handler received: {key}")
+
+scene.on_key = my_handler
+scene.activate()
+mcrfpy.step(0.1)
+print("  PASS - modern Scene API works")
+
+# Test 2: Check Scene properties
+print("Test 2: Scene properties")
+print(f"  scene.name = {scene.name}")
+print(f"  scene.active = {scene.active}")
+print(f"  len(scene.children) = {len(scene.children)}")
+
+# Test 3: Check if default_texture exists
+print("Test 3: default_texture")
+try:
+    dt = mcrfpy.default_texture
+    print(f"  mcrfpy.default_texture = {dt}")
+except AttributeError:
+    print("  default_texture NOT FOUND - docs bug!")
+
+# Test 4: Check if currentScene exists
+print("Test 4: currentScene()")
+try:
+    current = mcrfpy.currentScene()
+    print(f"  mcrfpy.currentScene() = {current}")
+except AttributeError:
+    print("  currentScene() NOT FOUND - docs bug!")
+
+# Test 5: Check Grid.at() signature
+print("Test 5: Grid.at() signature")
+texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+grid = mcrfpy.Grid(grid_size=(10, 10), texture=texture, pos=(0, 0), size=(200, 200))
+
+# Try both signatures
+try:
+    point_tuple = grid.at((5, 5))
+    print("  grid.at((x, y)) - tuple WORKS")
+except Exception as e:
+    print(f"  grid.at((x, y)) FAILS: {e}")
+
+try:
+    point_sep = grid.at(5, 5)
+    print("  grid.at(x, y) - separate args WORKS")
+except Exception as e:
+    print(f"  grid.at(x, y) FAILS: {e}")
+
+# Test 6: Scene transitions (setScene)
+print("Test 6: setScene()")
+scene2 = mcrfpy.Scene("test_transitions")
+scene2.activate()
+mcrfpy.step(0.1)
+
+# Check if setScene exists
+try:
+    mcrfpy.setScene("test_modern")
+    print("  mcrfpy.setScene() WORKS")
+except AttributeError:
+    print("  mcrfpy.setScene() NOT FOUND - use scene.activate() instead")
+except Exception as e:
+    print(f"  mcrfpy.setScene() error: {e}")
+
+# Take screenshot
+mcrfpy.step(0.1)
+automation.screenshot("/opt/goblincorps/repos/McRogueFace/tests/docs/screenshots/features_scenes.png")
+
+print("\nAll scene tests complete")
+sys.exit(0)

tests/docs/test_quickstart_entities.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+"""Test for quickstart.md 'Game Entity' example.
+
+Original (DEPRECATED - lines 133-168):
+    mcrfpy.createScene("game")
+    grid = mcrfpy.Grid(20, 15, texture, (10, 10), (640, 480))
+    ui = mcrfpy.sceneUI("game")
+    player = mcrfpy.Entity((10, 7), texture, 85)
+    mcrfpy.keypressScene(handle_keys)
+    mcrfpy.setScene("game")
+
+Modern equivalent below.
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+
+# Create scene using modern API
+scene = mcrfpy.Scene("game")
+scene.activate()
+mcrfpy.step(0.01)
+
+# Load texture
+texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+
+# Create grid using modern keyword API
+grid = mcrfpy.Grid(
+    grid_size=(20, 15),
+    texture=texture,
+    pos=(10, 10),
+    size=(640, 480)
+)
+scene.children.append(grid)
+
+# Add player entity
+player = mcrfpy.Entity(grid_pos=(10, 7), texture=texture, sprite_index=85)
+grid.entities.append(player)
+
+# Add NPC entity
+npc = mcrfpy.Entity(grid_pos=(5, 5), texture=texture, sprite_index=109)
+grid.entities.append(npc)
+
+# Add treasure chest
+treasure = mcrfpy.Entity(grid_pos=(15, 10), texture=texture, sprite_index=89)
+grid.entities.append(treasure)
+
+# Movement handler using modern API
+def handle_keys(key, state):
+    if state == "start":
+        x, y = player.pos[0], player.pos[1]
+        if key == "W":
+            player.pos = (x, y - 1)
+        elif key == "S":
+            player.pos = (x, y + 1)
+        elif key == "A":
+            player.pos = (x - 1, y)
+        elif key == "D":
+            player.pos = (x + 1, y)
+
+scene.on_key = handle_keys
+
+# Center grid on player
+grid.center = (10, 7)
+
+# Render and screenshot
+mcrfpy.step(0.1)
+automation.screenshot("/opt/goblincorps/repos/McRogueFace/tests/docs/screenshots/quickstart_entities.png")
+
+print("PASS - quickstart entities")
+sys.exit(0)

tests/docs/test_quickstart_main_menu.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+"""Test for quickstart.md 'Main Menu' example.
+
+Original (DEPRECATED - lines 82-125):
+    mcrfpy.createScene("main_menu")
+    ui = mcrfpy.sceneUI("main_menu")
+    bg = mcrfpy.Frame(0, 0, 1024, 768, fill_color=(20, 20, 40))
+    title = mcrfpy.Caption((312, 100), "My Awesome Game", font, fill_color=(255, 255, 100))
+    button_frame.click = start_game
+    mcrfpy.setScene("main_menu")
+
+Modern equivalent below.
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+
+# Create scene using modern API
+scene = mcrfpy.Scene("main_menu")
+scene.activate()
+mcrfpy.step(0.01)
+
+# Load font
+font = mcrfpy.Font("assets/JetbrainsMono.ttf")
+
+# Add background using modern Frame API (keyword args)
+bg = mcrfpy.Frame(
+    pos=(0, 0),
+    size=(1024, 768),
+    fill_color=mcrfpy.Color(20, 20, 40)
+)
+scene.children.append(bg)
+
+# Add title using modern Caption API
+title = mcrfpy.Caption(
+    pos=(312, 100),
+    text="My Awesome Game",
+    font=font,
+    fill_color=mcrfpy.Color(255, 255, 100)
+)
+title.font_size = 48
+title.outline = 2
+title.outline_color = mcrfpy.Color(0, 0, 0)
+scene.children.append(title)
+
+# Create button frame
+button_frame = mcrfpy.Frame(
+    pos=(362, 300),
+    size=(300, 80),
+    fill_color=mcrfpy.Color(50, 150, 50)
+)
+
+# Button caption
+button_caption = mcrfpy.Caption(
+    pos=(90, 25),  # Centered in button
+    text="Start Game",
+    fill_color=mcrfpy.Color(255, 255, 255)
+)
+button_caption.font_size = 24
+button_frame.children.append(button_caption)
+
+# Click handler using modern on_click (3 args: x, y, button)
+def start_game(x, y, button):
+    print("Starting the game!")
+
+button_frame.on_click = start_game
+scene.children.append(button_frame)
+
+# Render and screenshot
+mcrfpy.step(0.1)
+automation.screenshot("/opt/goblincorps/repos/McRogueFace/tests/docs/screenshots/quickstart_main_menu.png")
+
+print("PASS - quickstart main menu")
+sys.exit(0)

tests/docs/test_quickstart_simple_scene.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+"""Test for quickstart.md 'Simple Test Scene' example.
+
+Original (DEPRECATED - lines 48-74):
+    mcrfpy.createScene("test")
+    grid = mcrfpy.Grid(20, 15, texture, (10, 10), (800, 600))
+    ui = mcrfpy.sceneUI("test")
+    mcrfpy.setScene("test")
+    mcrfpy.keypressScene(move_around)
+
+Modern equivalent below.
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+
+# Create scene using modern API
+scene = mcrfpy.Scene("test")
+scene.activate()
+mcrfpy.step(0.01)  # Initialize
+
+# Load texture
+texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+
+# Create grid using modern keyword API
+grid = mcrfpy.Grid(
+    grid_size=(20, 15),
+    texture=texture,
+    pos=(10, 10),
+    size=(800, 600)
+)
+
+# Add to scene's children (not sceneUI)
+scene.children.append(grid)
+
+# Add keyboard controls using modern API
+def move_around(key, state):
+    if state == "start":
+        print(f"You pressed {key}")
+
+scene.on_key = move_around
+
+# Render and screenshot
+mcrfpy.step(0.1)
+automation.screenshot("/opt/goblincorps/repos/McRogueFace/tests/docs/screenshots/quickstart_simple_scene.png")
+
+print("PASS - quickstart simple scene")
+sys.exit(0)

tests/docs/test_quickstart_sprites.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+"""Test for quickstart.md 'Custom Sprite Sheet' example.
+
+Original (DEPRECATED - lines 176-201):
+    mcrfpy.createScene("game")
+    grid = mcrfpy.Grid(20, 15, my_texture, (10, 10), (640, 480))
+    grid.at(5, 5).sprite = 10
+    ui = mcrfpy.sceneUI("game")
+    mcrfpy.setScene("game")
+
+Modern equivalent below.
+"""
+import mcrfpy
+from mcrfpy import automation
+import sys
+
+# Create scene using modern API
+scene = mcrfpy.Scene("game")
+scene.activate()
+mcrfpy.step(0.01)
+
+# Load sprite sheet (using existing texture for test)
+texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+
+# Create grid using modern keyword API
+grid = mcrfpy.Grid(
+    grid_size=(20, 15),
+    texture=texture,
+    pos=(10, 10),
+    size=(640, 480)
+)
+
+# Set specific tiles using modern API
+# grid.at() returns a GridPoint with tilesprite property
+grid.at((5, 5)).tilesprite = 10  # Note: tuple for position
+grid.at((6, 5)).tilesprite = 11
+
+# Set walkability
+grid.at((6, 5)).walkable = False
+
+# Add grid to scene
+scene.children.append(grid)
+
+# Render and screenshot
+mcrfpy.step(0.1)
+automation.screenshot("/opt/goblincorps/repos/McRogueFace/tests/docs/screenshots/quickstart_sprites.png")
+
+print("PASS - quickstart sprites")
+sys.exit(0)

tests/pytest.ini

@@ -0,0 +1,14 @@
+[pytest]
+# McRogueFace test scripts run via subprocess, not as Python modules
+# They contain `import mcrfpy` which is only available inside McRogueFace
+
+# Don't try to import test scripts from these directories
+norecursedirs = unit integration regression benchmarks demo geometry_demo notes vllm_demo
+
+# Run test_*.py files in tests/ root that are pytest-native wrappers
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+
+# Custom option for timeout
+addopts = -v

tests/run_tests.py

@@ -7,6 +7,8 @@ Usage:
     python3 tests/run_tests.py           # Run all tests
     python3 tests/run_tests.py unit      # Run only unit tests
     python3 tests/run_tests.py -v        # Verbose output
+    python3 tests/run_tests.py -q        # Quiet (no checksums)
+    python3 tests/run_tests.py --timeout=30  # Custom timeout
 """
 import os
 import subprocess
@@ -18,8 +20,9 @@ from pathlib import Path
 # Configuration
 TESTS_DIR = Path(__file__).parent
 BUILD_DIR = TESTS_DIR.parent / "build"
+LIB_DIR = TESTS_DIR.parent / "__lib"
 MCROGUEFACE = BUILD_DIR / "mcrogueface"
-TIMEOUT = 10  # seconds per test
+DEFAULT_TIMEOUT = 10  # seconds per test
 
 # Test directories to run (in order)
 TEST_DIRS = ['unit', 'integration', 'regression']
@@ -39,7 +42,7 @@ def get_screenshot_checksum(test_dir):
             checksums[png.name] = hashlib.md5(f.read()).hexdigest()[:8]
     return checksums
 
-def run_test(test_path, verbose=False):
+def run_test(test_path, verbose=False, timeout=DEFAULT_TIMEOUT):
     """Run a single test and return (passed, duration, output)."""
     start = time.time()
 
@@ -47,13 +50,19 @@ def run_test(test_path, verbose=False):
     for png in BUILD_DIR.glob("test_*.png"):
         png.unlink()
 
+    # Set up environment with library path
+    env = os.environ.copy()
+    existing_ld = env.get('LD_LIBRARY_PATH', '')
+    env['LD_LIBRARY_PATH'] = f"{LIB_DIR}:{existing_ld}" if existing_ld else str(LIB_DIR)
+
     try:
         result = subprocess.run(
             [str(MCROGUEFACE), '--headless', '--exec', str(test_path)],
             capture_output=True,
             text=True,
-            timeout=TIMEOUT,
-            cwd=str(BUILD_DIR)
+            timeout=timeout,
+            cwd=str(BUILD_DIR),
+            env=env
         )
         duration = time.time() - start
         passed = result.returncode == 0
@@ -66,7 +75,7 @@ def run_test(test_path, verbose=False):
         return passed, duration, output
 
     except subprocess.TimeoutExpired:
-        return False, TIMEOUT, "TIMEOUT"
+        return False, timeout, "TIMEOUT"
     except Exception as e:
         return False, 0, str(e)
 
@@ -79,6 +88,16 @@ def find_tests(directory):
 
 def main():
     verbose = '-v' in sys.argv or '--verbose' in sys.argv
+    quiet = '-q' in sys.argv or '--quiet' in sys.argv
+
+    # Parse --timeout=N
+    timeout = DEFAULT_TIMEOUT
+    for arg in sys.argv[1:]:
+        if arg.startswith('--timeout='):
+            try:
+                timeout = int(arg.split('=')[1])
+            except ValueError:
+                pass
 
     # Determine which directories to test
     dirs_to_test = []
@@ -89,7 +108,7 @@ def main():
         dirs_to_test = TEST_DIRS
 
     print(f"{BOLD}McRogueFace Test Runner{RESET}")
-    print(f"Testing: {', '.join(dirs_to_test)}")
+    print(f"Testing: {', '.join(dirs_to_test)} (timeout: {timeout}s)")
     print("=" * 60)
 
     results = {'pass': 0, 'fail': 0, 'total_time': 0}
@@ -104,7 +123,7 @@ def main():
 
         for test_path in tests:
             test_name = test_path.name
-            passed, duration, output = run_test(test_path, verbose)
+            passed, duration, output = run_test(test_path, verbose, timeout)
             results['total_time'] += duration
 
             if passed:
@@ -115,11 +134,12 @@ def main():
                 status = f"{RED}FAIL{RESET}"
                 failures.append((test_dir, test_name, output))
 
-            # Get screenshot checksums if any were generated
-            checksums = get_screenshot_checksum(BUILD_DIR)
+            # Get screenshot checksums if any were generated (skip in quiet mode)
             checksum_str = ""
-            if checksums:
-                checksum_str = f" [{', '.join(f'{k}:{v}' for k,v in checksums.items())}]"
+            if not quiet:
+                checksums = get_screenshot_checksum(BUILD_DIR)
+                if checksums:
+                    checksum_str = f" [{', '.join(f'{k}:{v}' for k,v in checksums.items())}]"
 
             print(f"  {status} {test_name} ({duration:.2f}s){checksum_str}")
 

tests/test_mcrogueface.py

@@ -0,0 +1,116 @@
+"""
+Pytest wrapper for McRogueFace test scripts.
+
+This file discovers and runs all McRogueFace test scripts in unit/, integration/,
+and regression/ directories via subprocess.
+
+Usage:
+    pytest tests/test_mcrogueface.py -q                  # Quiet output
+    pytest tests/test_mcrogueface.py -k "bsp"            # Filter by name
+    pytest tests/test_mcrogueface.py --mcrf-timeout=30   # Custom timeout
+    pytest tests/test_mcrogueface.py -x                  # Stop on first failure
+"""
+import os
+import subprocess
+import pytest
+from pathlib import Path
+
+# Paths
+TESTS_DIR = Path(__file__).parent
+BUILD_DIR = TESTS_DIR.parent / "build"
+LIB_DIR = TESTS_DIR.parent / "__lib"
+MCROGUEFACE = BUILD_DIR / "mcrogueface"
+
+# Test directories
+TEST_DIRS = ['unit', 'integration', 'regression']
+
+# Default timeout
+DEFAULT_TIMEOUT = 10
+
+
+def discover_tests():
+    """Find all test scripts in test directories."""
+    tests = []
+    for test_dir in TEST_DIRS:
+        dir_path = TESTS_DIR / test_dir
+        if dir_path.exists():
+            for test_file in sorted(dir_path.glob("*.py")):
+                if test_file.name != '__init__.py':
+                    rel_path = f"{test_dir}/{test_file.name}"
+                    tests.append(rel_path)
+    return tests
+
+
+def get_env():
+    """Get environment with LD_LIBRARY_PATH set."""
+    env = os.environ.copy()
+    existing_ld = env.get('LD_LIBRARY_PATH', '')
+    env['LD_LIBRARY_PATH'] = f"{LIB_DIR}:{existing_ld}" if existing_ld else str(LIB_DIR)
+    return env
+
+
+def run_mcrf_test(script_path, timeout=DEFAULT_TIMEOUT):
+    """Run a McRogueFace test script and return (passed, output)."""
+    full_path = TESTS_DIR / script_path
+    env = get_env()
+
+    try:
+        result = subprocess.run(
+            [str(MCROGUEFACE), '--headless', '--exec', str(full_path)],
+            capture_output=True,
+            text=True,
+            timeout=timeout,
+            cwd=str(BUILD_DIR),
+            env=env
+        )
+
+        output = result.stdout + result.stderr
+        passed = result.returncode == 0
+
+        # Check for PASS/FAIL in output
+        if 'FAIL' in output and 'PASS' not in output.split('FAIL')[-1]:
+            passed = False
+
+        return passed, output
+
+    except subprocess.TimeoutExpired:
+        return False, "TIMEOUT"
+    except Exception as e:
+        return False, str(e)
+
+
+# Discover tests at module load time
+ALL_TESTS = discover_tests()
+
+
+@pytest.fixture
+def mcrf_timeout(request):
+    """Get timeout from command line or default."""
+    return request.config.getoption("--mcrf-timeout", default=DEFAULT_TIMEOUT)
+
+
+def pytest_addoption(parser):
+    """Add --mcrf-timeout option."""
+    try:
+        parser.addoption(
+            "--mcrf-timeout",
+            action="store",
+            default=DEFAULT_TIMEOUT,
+            type=int,
+            help="Timeout in seconds for McRogueFace tests"
+        )
+    except ValueError:
+        # Option already added
+        pass
+
+
+@pytest.mark.parametrize("script_path", ALL_TESTS, ids=lambda x: x.replace('/', '::'))
+def test_mcrogueface_script(script_path, request):
+    """Run a McRogueFace test script."""
+    timeout = request.config.getoption("--mcrf-timeout", default=DEFAULT_TIMEOUT)
+    passed, output = run_mcrf_test(script_path, timeout=timeout)
+
+    if not passed:
+        # Show last 15 lines of output on failure
+        lines = output.strip().split('\n')[-15:]
+        pytest.fail('\n'.join(lines))

tests/unit/WORKING_automation_test_example.py

@@ -1,47 +1,11 @@
 #!/usr/bin/env python3
-"""Example of CORRECT test pattern using timer callbacks for automation"""
+"""Example of CORRECT test pattern using mcrfpy.step() for automation
+Refactored from timer-based approach to synchronous step() pattern.
+"""
 import mcrfpy
 from mcrfpy import automation
 from datetime import datetime
-
-def run_automation_tests(timer, runtime):
-    """This runs AFTER the game loop has started and rendered frames"""
-    print("\n=== Automation Test Running (1 second after start) ===")
-
-    # NOW we can take screenshots that will show content!
-    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
-    filename = f"WORKING_screenshot_{timestamp}.png"
-
-    # Take screenshot - this should now show our red frame
-    result = automation.screenshot(filename)
-    print(f"Screenshot taken: {filename} - Result: {result}")
-
-    # Test clicking on the frame
-    automation.click(200, 200)  # Click in center of red frame
-
-    # Test keyboard input
-    automation.typewrite("Hello from timer callback!")
-
-    # Take another screenshot to show any changes
-    filename2 = f"WORKING_screenshot_after_click_{timestamp}.png"
-    automation.screenshot(filename2)
-    print(f"Second screenshot: {filename2}")
-
-    print("Test completed successfully!")
-    print("\nThis works because:")
-    print("1. The game loop has been running for 1 second")
-    print("2. The scene has been rendered multiple times")
-    print("3. The RenderTexture now contains actual rendered content")
-
-    # Cancel this timer so it doesn't repeat
-    timer.stop()
-
-    # Optional: exit after a moment
-    def exit_game(t, r):
-        print("Exiting...")
-        mcrfpy.exit()
-    global exit_timer
-    exit_timer = mcrfpy.Timer("exit", exit_game, 500, once=True)
+import sys
 
 # This code runs during --exec script execution
 print("=== Setting Up Test Scene ===")
@@ -49,6 +13,8 @@ print("=== Setting Up Test Scene ===")
 # Create scene with visible content
 timer_test_scene = mcrfpy.Scene("timer_test_scene")
 timer_test_scene.activate()
+mcrfpy.step(0.01)  # Initialize scene
+
 ui = timer_test_scene.children
 
 # Add a bright red frame that should be visible
@@ -60,23 +26,57 @@ ui.append(frame)
 
 # Add text
 caption = mcrfpy.Caption(pos=(150, 150),
-                        text="TIMER TEST - SHOULD BE VISIBLE",
+                        text="STEP TEST - SHOULD BE VISIBLE",
                         fill_color=mcrfpy.Color(255, 255, 255))
 caption.font_size = 24
 frame.children.append(caption)
 
 # Add click handler to demonstrate interaction
+click_received = False
 def frame_clicked(x, y, button):
+    global click_received
+    click_received = True
     print(f"Frame clicked at ({x}, {y}) with button {button}")
 
 frame.on_click = frame_clicked
 
-print("Scene setup complete. Setting timer for automation tests...")
+print("Scene setup complete.")
 
-# THIS IS THE KEY: Set timer to run AFTER the game loop starts
-automation_test_timer = mcrfpy.Timer("automation_test", run_automation_tests, 1000, once=True)
+# Step to render the scene
+mcrfpy.step(0.1)
 
-print("Timer set. Game loop will start after this script completes.")
-print("Automation tests will run 1 second later when content is visible.")
+print("\n=== Automation Test Running ===")
 
-# Script ends here - game loop starts next
+# NOW we can take screenshots that will show content!
+timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
+filename = f"WORKING_screenshot_{timestamp}.png"
+
+# Take screenshot - this should now show our red frame
+result = automation.screenshot(filename)
+print(f"Screenshot taken: {filename} - Result: {result}")
+
+# Test clicking on the frame
+automation.click(200, 200)  # Click in center of red frame
+
+# Step to process the click
+mcrfpy.step(0.1)
+
+# Test keyboard input
+automation.typewrite("Hello from step-based test!")
+
+# Step to process keyboard input
+mcrfpy.step(0.1)
+
+# Take another screenshot to show any changes
+filename2 = f"WORKING_screenshot_after_click_{timestamp}.png"
+automation.screenshot(filename2)
+print(f"Second screenshot: {filename2}")
+
+print("Test completed successfully!")
+print("\nThis works because:")
+print("1. mcrfpy.step() advances simulation synchronously")
+print("2. The scene renders during step() calls")
+print("3. The RenderTexture contains actual rendered content")
+
+print("PASS")
+sys.exit(0)

tests/unit/alignment_test.py

@@ -46,10 +46,12 @@ print("Test 3: Checking margin properties...")
 try:
     frame = mcrfpy.Frame(pos=(0, 0), size=(100, 100))
 
-    # Check default margins are 0
-    assert frame.margin == 0, f"Expected margin=0, got {frame.margin}"
-    assert frame.horiz_margin == 0, f"Expected horiz_margin=0, got {frame.horiz_margin}"
-    assert frame.vert_margin == 0, f"Expected vert_margin=0, got {frame.vert_margin}"
+    # Check default margins:
+    # - margin returns 0 when both horiz/vert are unset (effective default)
+    # - horiz_margin/vert_margin return -1 (sentinel for "not set")
+    assert frame.margin == 0.0, f"Expected margin=0 (effective default), got {frame.margin}"
+    assert frame.horiz_margin == -1.0, f"Expected horiz_margin=-1 (unset), got {frame.horiz_margin}"
+    assert frame.vert_margin == -1.0, f"Expected vert_margin=-1 (unset), got {frame.vert_margin}"
 
     # Set margins when no alignment
     frame.margin = 10.0

tests/unit/simple_timer_screenshot_test.py

@@ -1,28 +1,23 @@
 #!/usr/bin/env python3
-"""Simplified test to verify timer-based screenshots work"""
+"""Test to verify timer-based screenshots work using mcrfpy.step() for synchronous execution"""
 import mcrfpy
 from mcrfpy import automation
+import sys
 
 # Counter to track timer calls
 call_count = 0
 
-def take_screenshot_and_exit(timer, runtime):
-    """Timer callback that takes screenshot then exits"""
+def take_screenshot(timer, runtime):
+    """Timer callback that takes screenshot"""
     global call_count
     call_count += 1
-
-    print(f"\nTimer callback fired! (call #{call_count})")
+    print(f"Timer callback fired! (call #{call_count}, runtime={runtime})")
 
     # Take screenshot
     filename = f"timer_screenshot_test_{call_count}.png"
     result = automation.screenshot(filename)
     print(f"Screenshot result: {result} -> {filename}")
 
-    # Exit after first call
-    if call_count >= 1:
-        print("Exiting game...")
-        mcrfpy.exit()
-
 # Set up a simple scene
 print("Creating test scene...")
 test = mcrfpy.Scene("test")
@@ -35,6 +30,17 @@ frame = mcrfpy.Frame(pos=(100, 100), size=(200, 200),
 ui.append(frame)
 
 print("Setting timer to fire in 100ms...")
-mcrfpy.Timer("screenshot_timer", take_screenshot_and_exit, 100, once=True)
+timer = mcrfpy.Timer("screenshot_timer", take_screenshot, 100, once=True)
+print(f"Timer created: {timer}")
 
-print("Setup complete. Game loop starting...")
+# Use mcrfpy.step() to advance simulation synchronously instead of waiting
+print("Advancing simulation by 200ms using step()...")
+mcrfpy.step(0.2)  # Advance 200ms - timer at 100ms should fire
+
+# Verify timer fired
+if call_count >= 1:
+    print("SUCCESS: Timer fired and screenshot taken!")
+    sys.exit(0)
+else:
+    print(f"FAIL: Expected call_count >= 1, got {call_count}")
+    sys.exit(1)

tests/unit/test_animation_callback_simple.py

@@ -1,73 +1,55 @@
 #!/usr/bin/env python3
-"""Simple test for animation callbacks - demonstrates basic usage"""
+"""Simple test for animation callbacks using mcrfpy.step() for synchronous execution"""
 
 import mcrfpy
 import sys
 
+print("Animation Callback Demo")
+print("=" * 30)
+
 # Global state to track callback
 callback_count = 0
-callback_demo = None  # Will be set in setup_and_run
 
 def my_callback(anim, target):
     """Simple callback that prints when animation completes"""
     global callback_count
     callback_count += 1
     print(f"Animation completed! Callback #{callback_count}")
-    # For now, anim and target are None - future enhancement
 
-def setup_and_run():
-    """Set up scene and run animation with callback"""
-    global callback_demo
-    # Create scene
-    callback_demo = mcrfpy.Scene("callback_demo")
-    callback_demo.activate()
+# Create scene
+callback_demo = mcrfpy.Scene("callback_demo")
+callback_demo.activate()
 
-    # Create a frame to animate
-    frame = mcrfpy.Frame((100, 100), (200, 200), fill_color=(255, 0, 0))
-    ui = callback_demo.children
-    ui.append(frame)
+# Create a frame to animate
+frame = mcrfpy.Frame((100, 100), (200, 200), fill_color=(255, 0, 0))
+ui = callback_demo.children
+ui.append(frame)
 
-    # Create animation with callback
-    print("Starting animation with callback...")
-    anim = mcrfpy.Animation("x", 400.0, 1.0, "easeInOutQuad", callback=my_callback)
-    anim.start(frame)
+# Test 1: Animation with callback
+print("Starting animation with callback (1.0s duration)...")
+anim = mcrfpy.Animation("x", 400.0, 1.0, "easeInOutQuad", callback=my_callback)
+anim.start(frame)
 
-    # Schedule check after animation should complete
-    mcrfpy.Timer("check", check_result, 1500, once=True)
+# Use mcrfpy.step() to advance past animation completion
+mcrfpy.step(1.5)  # Advance 1.5 seconds - animation completes at 1.0s
 
-def check_result(timer, runtime):
-    """Check if callback fired correctly"""
-    global callback_count, callback_demo
+if callback_count != 1:
+    print(f"FAIL: Expected 1 callback, got {callback_count}")
+    sys.exit(1)
+print("SUCCESS: Callback fired exactly once!")
 
-    if callback_count == 1:
-        print("SUCCESS: Callback fired exactly once!")
+# Test 2: Animation without callback
+print("\nTesting animation without callback (0.5s duration)...")
+anim2 = mcrfpy.Animation("y", 300.0, 0.5, "linear")
+anim2.start(frame)
 
-        # Test 2: Animation without callback
-        print("\nTesting animation without callback...")
-        ui = callback_demo.children
-        frame = ui[0]
+# Advance past second animation
+mcrfpy.step(0.7)
 
-        anim2 = mcrfpy.Animation("y", 300.0, 0.5, "linear")
-        anim2.start(frame)
+if callback_count != 1:
+    print(f"FAIL: Callback count changed to {callback_count}")
+    sys.exit(1)
 
-        mcrfpy.Timer("final", final_check, 700, once=True)
-    else:
-        print(f"FAIL: Expected 1 callback, got {callback_count}")
-        sys.exit(1)
-
-def final_check(timer, runtime):
-    """Final check - callback count should still be 1"""
-    global callback_count
-
-    if callback_count == 1:
-        print("SUCCESS: No unexpected callbacks fired!")
-        print("\nAnimation callback feature working correctly!")
-        sys.exit(0)
-    else:
-        print(f"FAIL: Callback count changed to {callback_count}")
-        sys.exit(1)
-
-# Start the demo
-print("Animation Callback Demo")
-print("=" * 30)
-setup_and_run()
+print("SUCCESS: No unexpected callbacks fired!")
+print("\nAnimation callback feature working correctly!")
+sys.exit(0)

tests/unit/test_animation_property_locking.py

@@ -210,7 +210,7 @@ def test_8_replace_completes_old():
         test_result("Replace completes old animation", False, str(e))
 
 
-def run_all_tests(timer, runtime):
+def run_all_tests():
     """Run all property locking tests"""
     print("\nRunning Animation Property Locking Tests...")
     print("-" * 50)
@@ -245,5 +245,8 @@ def run_all_tests(timer, runtime):
 test = mcrfpy.Scene("test")
 test.activate()
 
-# Start tests after a brief delay to allow scene to initialize
-mcrfpy.Timer("start", run_all_tests, 100, once=True)
+# Use mcrfpy.step() to advance simulation for scene initialization
+mcrfpy.step(0.1)  # Brief step to initialize scene
+
+# Run tests directly (no timer needed with step-based approach)
+run_all_tests()

tests/unit/test_animation_raii.py

@@ -2,6 +2,7 @@
 """
 Test the RAII AnimationManager implementation.
 This verifies that weak_ptr properly handles all crash scenarios.
+Uses mcrfpy.step() for synchronous test execution.
 """
 
 import mcrfpy
@@ -19,189 +20,14 @@ def test_result(name, passed, details=""):
     global tests_passed, tests_failed
     if passed:
         tests_passed += 1
-        result = f"✓ {name}"
+        result = f"PASS: {name}"
     else:
         tests_failed += 1
-        result = f"✗ {name}: {details}"
+        result = f"FAIL: {name}: {details}"
     print(result)
     test_results.append((name, passed, details))
 
-def test_1_basic_animation():
-    """Test that basic animations still work"""
-    try:
-        ui = test.children
-        frame = mcrfpy.Frame(pos=(100, 100), size=(100, 100))
-        ui.append(frame)
-        
-        anim = mcrfpy.Animation("x", 200.0, 1000, "linear")
-        anim.start(frame)
-        
-        # Check if animation has valid target
-        if hasattr(anim, 'hasValidTarget'):
-            valid = anim.hasValidTarget()
-            test_result("Basic animation with hasValidTarget", valid)
-        else:
-            test_result("Basic animation", True)
-    except Exception as e:
-        test_result("Basic animation", False, str(e))
-
-def test_2_remove_animated_object():
-    """Test removing object with active animation"""
-    try:
-        ui = test.children
-        frame = mcrfpy.Frame(pos=(100, 100), size=(100, 100))
-        ui.append(frame)
-        
-        # Start animation
-        anim = mcrfpy.Animation("x", 500.0, 2000, "easeInOut")
-        anim.start(frame)
-        
-        # Remove the frame
-        ui.remove(0)
-        
-        # Check if animation knows target is gone
-        if hasattr(anim, 'hasValidTarget'):
-            valid = anim.hasValidTarget()
-            test_result("Animation detects removed target", not valid)
-        else:
-            # If method doesn't exist, just check we didn't crash
-            test_result("Remove animated object", True)
-    except Exception as e:
-        test_result("Remove animated object", False, str(e))
-
-def test_3_complete_animation():
-    """Test completing animation immediately"""
-    try:
-        ui = test.children
-        frame = mcrfpy.Frame(pos=(100, 100), size=(100, 100))
-        ui.append(frame)
-        
-        # Start animation
-        anim = mcrfpy.Animation("x", 500.0, 2000, "linear")
-        anim.start(frame)
-        
-        # Complete it
-        if hasattr(anim, 'complete'):
-            anim.complete()
-            # Frame should now be at x=500
-            test_result("Animation complete method", True)
-        else:
-            test_result("Animation complete method", True, "Method not available")
-    except Exception as e:
-        test_result("Animation complete method", False, str(e))
-
-def test_4_multiple_animations_timer():
-    """Test creating multiple animations in timer callback"""
-    success = False
-
-    def create_animations(timer, runtime):
-        nonlocal success
-        try:
-            ui = test.children
-            frame = mcrfpy.Frame(pos=(200, 200), size=(100, 100))
-            ui.append(frame)
-
-            # Create multiple animations rapidly (this used to crash)
-            for i in range(10):
-                anim = mcrfpy.Animation("x", 300.0 + i * 10, 1000, "linear")
-                anim.start(frame)
-
-            success = True
-        except Exception as e:
-            print(f"Timer animation error: {e}")
-        finally:
-            mcrfpy.Timer("exit", lambda t, r: None, 100, once=True)
-
-    # Clear scene
-    ui = test.children
-    while len(ui) > 0:
-        ui.remove(len(ui) - 1)
-
-    mcrfpy.Timer("test", create_animations, 50, once=True)
-    mcrfpy.Timer("check", lambda t, r: test_result("Multiple animations in timer", success), 200, once=True)
-
-def test_5_scene_cleanup():
-    """Test that changing scenes cleans up animations"""
-    try:
-        # Create a second scene
-        test2 = mcrfpy.Scene("test2")
-        
-        # Add animated objects to first scene
-        ui = test.children
-        for i in range(5):
-            frame = mcrfpy.Frame(pos=(50 * i, 100), size=(40, 40))
-            ui.append(frame)
-            anim = mcrfpy.Animation("y", 300.0, 2000, "easeOutBounce")
-            anim.start(frame)
-        
-        # Switch scenes (animations should become invalid)
-        test2.activate()
-        
-        # Switch back
-        test.activate()
-        
-        test_result("Scene change cleanup", True)
-    except Exception as e:
-        test_result("Scene change cleanup", False, str(e))
-
-def test_6_animation_after_clear():
-    """Test animations after clearing UI"""
-    try:
-        ui = test.children
-
-        # Create and animate
-        frame = mcrfpy.Frame(pos=(100, 100), size=(100, 100))
-        ui.append(frame)
-        anim = mcrfpy.Animation("w", 200.0, 1500, "easeInOutCubic")
-        anim.start(frame)
-        
-        # Clear all UI
-        while len(ui) > 0:
-            ui.remove(len(ui) - 1)
-        
-        # Animation should handle this gracefully
-        if hasattr(anim, 'hasValidTarget'):
-            valid = anim.hasValidTarget()
-            test_result("Animation after UI clear", not valid)
-        else:
-            test_result("Animation after UI clear", True)
-    except Exception as e:
-        test_result("Animation after UI clear", False, str(e))
-
-def run_all_tests(timer, runtime):
-    """Run all RAII tests"""
-    print("\nRunning RAII Animation Tests...")
-    print("-" * 40)
-
-    test_1_basic_animation()
-    test_2_remove_animated_object()
-    test_3_complete_animation()
-    test_4_multiple_animations_timer()
-    test_5_scene_cleanup()
-    test_6_animation_after_clear()
-
-    # Schedule result summary
-    mcrfpy.Timer("results", print_results, 500, once=True)
-
-def print_results(timer, runtime):
-    """Print test results"""
-    print("\n" + "=" * 40)
-    print(f"Tests passed: {tests_passed}")
-    print(f"Tests failed: {tests_failed}")
-
-    if tests_failed == 0:
-        print("\n+ All tests passed! RAII implementation is working correctly.")
-    else:
-        print(f"\nx {tests_failed} tests failed.")
-        print("\nFailed tests:")
-        for name, passed, details in test_results:
-            if not passed:
-                print(f"  - {name}: {details}")
-
-    # Exit
-    mcrfpy.Timer("exit", lambda t, r: sys.exit(0 if tests_failed == 0 else 1), 500, once=True)
-
-# Setup and run
+# Setup scene
 test = mcrfpy.Scene("test")
 test.activate()
 
@@ -211,5 +37,125 @@ bg = mcrfpy.Frame(pos=(0, 0), size=(1024, 768))
 bg.fill_color = mcrfpy.Color(20, 20, 30)
 ui.append(bg)
 
-# Start tests
-start_timer = mcrfpy.Timer("start", run_all_tests, 100, once=True)
+# Initialize scene
+mcrfpy.step(0.1)
+
+print("\nRunning RAII Animation Tests...")
+print("-" * 40)
+
+# Test 1: Basic animation
+try:
+    frame = mcrfpy.Frame(pos=(100, 100), size=(100, 100))
+    ui.append(frame)
+
+    anim = mcrfpy.Animation("x", 200.0, 1000, "linear")
+    anim.start(frame)
+
+    if hasattr(anim, 'hasValidTarget'):
+        valid = anim.hasValidTarget()
+        test_result("Basic animation with hasValidTarget", valid)
+    else:
+        test_result("Basic animation", True)
+except Exception as e:
+    test_result("Basic animation", False, str(e))
+
+# Test 2: Remove animated object
+try:
+    frame = mcrfpy.Frame(pos=(100, 100), size=(100, 100))
+    ui.append(frame)
+
+    anim = mcrfpy.Animation("x", 500.0, 2000, "easeInOut")
+    anim.start(frame)
+
+    ui.remove(frame)
+
+    if hasattr(anim, 'hasValidTarget'):
+        valid = anim.hasValidTarget()
+        test_result("Animation detects removed target", not valid)
+    else:
+        test_result("Remove animated object", True)
+except Exception as e:
+    test_result("Remove animated object", False, str(e))
+
+# Test 3: Complete animation immediately
+try:
+    frame = mcrfpy.Frame(pos=(100, 100), size=(100, 100))
+    ui.append(frame)
+
+    anim = mcrfpy.Animation("x", 500.0, 2000, "linear")
+    anim.start(frame)
+
+    if hasattr(anim, 'complete'):
+        anim.complete()
+        test_result("Animation complete method", True)
+    else:
+        test_result("Animation complete method", True, "Method not available")
+except Exception as e:
+    test_result("Animation complete method", False, str(e))
+
+# Test 4: Multiple animations rapidly
+try:
+    frame = mcrfpy.Frame(pos=(200, 200), size=(100, 100))
+    ui.append(frame)
+
+    for i in range(10):
+        anim = mcrfpy.Animation("x", 300.0 + i * 10, 1000, "linear")
+        anim.start(frame)
+
+    test_result("Multiple animations rapidly", True)
+except Exception as e:
+    test_result("Multiple animations rapidly", False, str(e))
+
+# Test 5: Scene cleanup
+try:
+    test2 = mcrfpy.Scene("test2")
+
+    for i in range(5):
+        frame = mcrfpy.Frame(pos=(50 * i, 100), size=(40, 40))
+        ui.append(frame)
+        anim = mcrfpy.Animation("y", 300.0, 2000, "easeOutBounce")
+        anim.start(frame)
+
+    test2.activate()
+    mcrfpy.step(0.1)
+    test.activate()
+    mcrfpy.step(0.1)
+
+    test_result("Scene change cleanup", True)
+except Exception as e:
+    test_result("Scene change cleanup", False, str(e))
+
+# Test 6: Animation after clearing UI
+try:
+    frame = mcrfpy.Frame(pos=(100, 100), size=(100, 100))
+    ui.append(frame)
+    anim = mcrfpy.Animation("w", 200.0, 1500, "easeInOutCubic")
+    anim.start(frame)
+
+    # Clear all UI except background - iterate in reverse
+    for i in range(len(ui) - 1, 0, -1):
+        ui.remove(ui[i])
+
+    if hasattr(anim, 'hasValidTarget'):
+        valid = anim.hasValidTarget()
+        test_result("Animation after UI clear", not valid)
+    else:
+        test_result("Animation after UI clear", True)
+except Exception as e:
+    test_result("Animation after UI clear", False, str(e))
+
+# Print results
+print("\n" + "=" * 40)
+print(f"Tests passed: {tests_passed}")
+print(f"Tests failed: {tests_failed}")
+
+if tests_failed == 0:
+    print("\nAll tests passed! RAII implementation is working correctly.")
+else:
+    print(f"\n{tests_failed} tests failed.")
+    print("\nFailed tests:")
+    for name, passed, details in test_results:
+        if not passed:
+            print(f"  - {name}: {details}")
+
+sys.exit(0 if tests_failed == 0 else 1)

tests/unit/test_animation_removal.py

@@ -1,40 +1,14 @@
 #!/usr/bin/env python3
 """
-Test if the crash is related to removing animated objects
+Test if the crash is related to removing animated objects.
+Uses mcrfpy.step() for synchronous test execution.
 """
 
 import mcrfpy
 import sys
 
-def clear_and_recreate(timer, runtime):
-    """Clear UI and recreate - mimics demo switching"""
-    print(f"\nTimer called at {runtime}")
-    
-    ui = test.children
-    
-    # Remove all but first 2 items (like clear_demo_objects)
-    print(f"Scene has {len(ui)} elements before clearing")
-    while len(ui) > 2:
-        ui.remove(len(ui)-1)
-    print(f"Scene has {len(ui)} elements after clearing")
-    
-    # Create new animated objects
-    print("Creating new animated objects...")
-    for i in range(5):
-        f = mcrfpy.Frame(100 + i*50, 200, 40, 40)
-        f.fill_color = mcrfpy.Color(100 + i*30, 50, 200)
-        ui.append(f)
-        
-        # Start animation on the new frame
-        target_x = 300 + i * 50
-        anim = mcrfpy.Animation("x", float(target_x), 1.0, "easeInOut")
-        anim.start(f)
-    
-    print("New objects created and animated")
-
-    # Schedule exit
-    global exit_timer
-    exit_timer = mcrfpy.Timer("exit", lambda t, r: sys.exit(0), 2000, once=True)
+print("Animation Removal Test")
+print("=" * 40)
 
 # Create initial scene
 print("Creating scene...")
@@ -47,20 +21,61 @@ title = mcrfpy.Caption(pos=(400, 20), text="Test Title")
 subtitle = mcrfpy.Caption(pos=(400, 50), text="Test Subtitle")
 ui.extend([title, subtitle])
 
+# Initialize scene
+mcrfpy.step(0.1)
+
 # Create initial animated objects
 print("Creating initial animated objects...")
+initial_frames = []
 for i in range(10):
     f = mcrfpy.Frame(pos=(50 + i*30, 100), size=(25, 25))
     f.fill_color = mcrfpy.Color(255, 100, 100)
     ui.append(f)
-    
+    initial_frames.append(f)
+
     # Animate them
     anim = mcrfpy.Animation("y", 300.0, 2.0, "easeOutBounce")
     anim.start(f)
 
 print(f"Initial scene has {len(ui)} elements")
 
-# Schedule the clear and recreate
-switch_timer = mcrfpy.Timer("switch", clear_and_recreate, 1000, once=True)
+# Let animations run a bit
+mcrfpy.step(0.5)
 
-print("\nEntering game loop...")
+# Clear and recreate - mimics demo switching
+print("\nClearing and recreating...")
+print(f"Scene has {len(ui)} elements before clearing")
+
+# Remove all but first 2 items (like clear_demo_objects)
+# Use reverse iteration to remove by element
+while len(ui) > 2:
+    ui.remove(ui[-1])
+
+print(f"Scene has {len(ui)} elements after clearing")
+
+# Create new animated objects
+print("Creating new animated objects...")
+for i in range(5):
+    f = mcrfpy.Frame(pos=(100 + i*50, 200), size=(40, 40))
+    f.fill_color = mcrfpy.Color(100 + i*30, 50, 200)
+    ui.append(f)
+
+    # Start animation on the new frame
+    target_x = 300 + i * 50
+    anim = mcrfpy.Animation("x", float(target_x), 1.0, "easeInOut")
+    anim.start(f)
+
+print("New objects created and animated")
+print(f"Scene now has {len(ui)} elements")
+
+# Let new animations run
+mcrfpy.step(1.5)
+
+# Final check
+print(f"\nFinal scene has {len(ui)} elements")
+if len(ui) == 7:  # 2 captions + 5 new frames
+    print("SUCCESS: Animation removal test passed!")
+    sys.exit(0)
+else:
+    print(f"FAIL: Expected 7 elements, got {len(ui)}")
+    sys.exit(1)

tests/unit/test_color_helpers.py

@@ -1,182 +1,181 @@
 #!/usr/bin/env python3
 """
 Test #94: Color helper methods - from_hex, to_hex, lerp
+Refactored to use mcrfpy.step() for synchronous execution.
 """
 
 import mcrfpy
 import sys
 
-def test_color_helpers(timer, runtime):
-    """Test Color helper methods"""
-    
-    all_pass = True
-    
-    # Test 1: from_hex with # prefix
-    try:
-        c1 = mcrfpy.Color.from_hex("#FF0000")
-        assert c1.r == 255 and c1.g == 0 and c1.b == 0 and c1.a == 255, f"from_hex('#FF0000') failed: {c1}"
-        print("+ Color.from_hex('#FF0000') works")
-    except Exception as e:
-        print(f"x Color.from_hex('#FF0000') failed: {e}")
-        all_pass = False
-    
-    # Test 2: from_hex without # prefix
-    try:
-        c2 = mcrfpy.Color.from_hex("00FF00")
-        assert c2.r == 0 and c2.g == 255 and c2.b == 0 and c2.a == 255, f"from_hex('00FF00') failed: {c2}"
-        print("+ Color.from_hex('00FF00') works")
-    except Exception as e:
-        print(f"x Color.from_hex('00FF00') failed: {e}")
-        all_pass = False
-    
-    # Test 3: from_hex with alpha
-    try:
-        c3 = mcrfpy.Color.from_hex("#0000FF80")
-        assert c3.r == 0 and c3.g == 0 and c3.b == 255 and c3.a == 128, f"from_hex('#0000FF80') failed: {c3}"
-        print("+ Color.from_hex('#0000FF80') with alpha works")
-    except Exception as e:
-        print(f"x Color.from_hex('#0000FF80') failed: {e}")
-        all_pass = False
-    
-    # Test 4: from_hex error handling
-    try:
-        c4 = mcrfpy.Color.from_hex("GGGGGG")
-        print("x from_hex should fail on invalid hex")
-        all_pass = False
-    except ValueError as e:
-        print("+ Color.from_hex() correctly rejects invalid hex")
-    
-    # Test 5: from_hex wrong length
-    try:
-        c5 = mcrfpy.Color.from_hex("FF00")
-        print("x from_hex should fail on wrong length")
-        all_pass = False
-    except ValueError as e:
-        print("+ Color.from_hex() correctly rejects wrong length")
-    
-    # Test 6: to_hex without alpha
-    try:
-        c6 = mcrfpy.Color(255, 128, 64)
-        hex_str = c6.to_hex()
-        assert hex_str == "#FF8040", f"to_hex() failed: {hex_str}"
-        print("+ Color.to_hex() works")
-    except Exception as e:
-        print(f"x Color.to_hex() failed: {e}")
-        all_pass = False
-    
-    # Test 7: to_hex with alpha
-    try:
-        c7 = mcrfpy.Color(255, 128, 64, 127)
-        hex_str = c7.to_hex()
-        assert hex_str == "#FF80407F", f"to_hex() with alpha failed: {hex_str}"
-        print("+ Color.to_hex() with alpha works")
-    except Exception as e:
-        print(f"x Color.to_hex() with alpha failed: {e}")
-        all_pass = False
-    
-    # Test 8: Round-trip hex conversion
-    try:
-        original_hex = "#ABCDEF"
-        c8 = mcrfpy.Color.from_hex(original_hex)
-        result_hex = c8.to_hex()
-        assert result_hex == original_hex, f"Round-trip failed: {original_hex} -> {result_hex}"
-        print("+ Hex round-trip conversion works")
-    except Exception as e:
-        print(f"x Hex round-trip failed: {e}")
-        all_pass = False
-    
-    # Test 9: lerp at t=0
-    try:
-        red = mcrfpy.Color(255, 0, 0)
-        blue = mcrfpy.Color(0, 0, 255)
-        result = red.lerp(blue, 0.0)
-        assert result.r == 255 and result.g == 0 and result.b == 0, f"lerp(t=0) failed: {result}"
-        print("+ Color.lerp(t=0) returns start color")
-    except Exception as e:
-        print(f"x Color.lerp(t=0) failed: {e}")
-        all_pass = False
-    
-    # Test 10: lerp at t=1
-    try:
-        red = mcrfpy.Color(255, 0, 0)
-        blue = mcrfpy.Color(0, 0, 255)
-        result = red.lerp(blue, 1.0)
-        assert result.r == 0 and result.g == 0 and result.b == 255, f"lerp(t=1) failed: {result}"
-        print("+ Color.lerp(t=1) returns end color")
-    except Exception as e:
-        print(f"x Color.lerp(t=1) failed: {e}")
-        all_pass = False
-    
-    # Test 11: lerp at t=0.5
-    try:
-        red = mcrfpy.Color(255, 0, 0)
-        blue = mcrfpy.Color(0, 0, 255)
-        result = red.lerp(blue, 0.5)
-        # Expect roughly (127, 0, 127)
-        assert 126 <= result.r <= 128 and result.g == 0 and 126 <= result.b <= 128, f"lerp(t=0.5) failed: {result}"
-        print("+ Color.lerp(t=0.5) returns midpoint")
-    except Exception as e:
-        print(f"x Color.lerp(t=0.5) failed: {e}")
-        all_pass = False
-    
-    # Test 12: lerp with alpha
-    try:
-        c1 = mcrfpy.Color(255, 0, 0, 255)
-        c2 = mcrfpy.Color(0, 255, 0, 0)
-        result = c1.lerp(c2, 0.5)
-        assert 126 <= result.r <= 128 and 126 <= result.g <= 128 and result.b == 0, f"lerp color components failed"
-        assert 126 <= result.a <= 128, f"lerp alpha failed: {result.a}"
-        print("+ Color.lerp() with alpha works")
-    except Exception as e:
-        print(f"x Color.lerp() with alpha failed: {e}")
-        all_pass = False
-    
-    # Test 13: lerp clamps t < 0
-    try:
-        red = mcrfpy.Color(255, 0, 0)
-        blue = mcrfpy.Color(0, 0, 255)
-        result = red.lerp(blue, -0.5)
-        assert result.r == 255 and result.g == 0 and result.b == 0, f"lerp(t<0) should clamp to 0"
-        print("+ Color.lerp() clamps t < 0")
-    except Exception as e:
-        print(f"x Color.lerp(t<0) failed: {e}")
-        all_pass = False
-    
-    # Test 14: lerp clamps t > 1
-    try:
-        red = mcrfpy.Color(255, 0, 0)
-        blue = mcrfpy.Color(0, 0, 255)
-        result = red.lerp(blue, 1.5)
-        assert result.r == 0 and result.g == 0 and result.b == 255, f"lerp(t>1) should clamp to 1"
-        print("+ Color.lerp() clamps t > 1")
-    except Exception as e:
-        print(f"x Color.lerp(t>1) failed: {e}")
-        all_pass = False
-    
-    # Test 15: Practical use case - gradient
-    try:
-        start = mcrfpy.Color.from_hex("#FF0000")  # Red
-        end = mcrfpy.Color.from_hex("#0000FF")    # Blue
-        
-        # Create 5-step gradient
-        steps = []
-        for i in range(5):
-            t = i / 4.0
-            color = start.lerp(end, t)
-            steps.append(color.to_hex())
-        
-        assert steps[0] == "#FF0000", "Gradient start should be red"
-        assert steps[4] == "#0000FF", "Gradient end should be blue"
-        assert len(set(steps)) == 5, "All gradient steps should be unique"
-        
-        print("+ Gradient generation works correctly")
-    except Exception as e:
-        print(f"x Gradient generation failed: {e}")
-        all_pass = False
-    
-    print(f"\n{'PASS' if all_pass else 'FAIL'}")
-    sys.exit(0 if all_pass else 1)
-
-# Run test
+# Initialize scene
 test = mcrfpy.Scene("test")
-test_timer = mcrfpy.Timer("test", test_color_helpers, 100, once=True)
+test.activate()
+mcrfpy.step(0.01)
+
+all_pass = True
+
+# Test 1: from_hex with # prefix
+try:
+    c1 = mcrfpy.Color.from_hex("#FF0000")
+    assert c1.r == 255 and c1.g == 0 and c1.b == 0 and c1.a == 255, f"from_hex('#FF0000') failed: {c1}"
+    print("+ Color.from_hex('#FF0000') works")
+except Exception as e:
+    print(f"x Color.from_hex('#FF0000') failed: {e}")
+    all_pass = False
+
+# Test 2: from_hex without # prefix
+try:
+    c2 = mcrfpy.Color.from_hex("00FF00")
+    assert c2.r == 0 and c2.g == 255 and c2.b == 0 and c2.a == 255, f"from_hex('00FF00') failed: {c2}"
+    print("+ Color.from_hex('00FF00') works")
+except Exception as e:
+    print(f"x Color.from_hex('00FF00') failed: {e}")
+    all_pass = False
+
+# Test 3: from_hex with alpha
+try:
+    c3 = mcrfpy.Color.from_hex("#0000FF80")
+    assert c3.r == 0 and c3.g == 0 and c3.b == 255 and c3.a == 128, f"from_hex('#0000FF80') failed: {c3}"
+    print("+ Color.from_hex('#0000FF80') with alpha works")
+except Exception as e:
+    print(f"x Color.from_hex('#0000FF80') failed: {e}")
+    all_pass = False
+
+# Test 4: from_hex error handling
+try:
+    c4 = mcrfpy.Color.from_hex("GGGGGG")
+    print("x from_hex should fail on invalid hex")
+    all_pass = False
+except ValueError as e:
+    print("+ Color.from_hex() correctly rejects invalid hex")
+
+# Test 5: from_hex wrong length
+try:
+    c5 = mcrfpy.Color.from_hex("FF00")
+    print("x from_hex should fail on wrong length")
+    all_pass = False
+except ValueError as e:
+    print("+ Color.from_hex() correctly rejects wrong length")
+
+# Test 6: to_hex without alpha
+try:
+    c6 = mcrfpy.Color(255, 128, 64)
+    hex_str = c6.to_hex()
+    assert hex_str == "#FF8040", f"to_hex() failed: {hex_str}"
+    print("+ Color.to_hex() works")
+except Exception as e:
+    print(f"x Color.to_hex() failed: {e}")
+    all_pass = False
+
+# Test 7: to_hex with alpha
+try:
+    c7 = mcrfpy.Color(255, 128, 64, 127)
+    hex_str = c7.to_hex()
+    assert hex_str == "#FF80407F", f"to_hex() with alpha failed: {hex_str}"
+    print("+ Color.to_hex() with alpha works")
+except Exception as e:
+    print(f"x Color.to_hex() with alpha failed: {e}")
+    all_pass = False
+
+# Test 8: Round-trip hex conversion
+try:
+    original_hex = "#ABCDEF"
+    c8 = mcrfpy.Color.from_hex(original_hex)
+    result_hex = c8.to_hex()
+    assert result_hex == original_hex, f"Round-trip failed: {original_hex} -> {result_hex}"
+    print("+ Hex round-trip conversion works")
+except Exception as e:
+    print(f"x Hex round-trip failed: {e}")
+    all_pass = False
+
+# Test 9: lerp at t=0
+try:
+    red = mcrfpy.Color(255, 0, 0)
+    blue = mcrfpy.Color(0, 0, 255)
+    result = red.lerp(blue, 0.0)
+    assert result.r == 255 and result.g == 0 and result.b == 0, f"lerp(t=0) failed: {result}"
+    print("+ Color.lerp(t=0) returns start color")
+except Exception as e:
+    print(f"x Color.lerp(t=0) failed: {e}")
+    all_pass = False
+
+# Test 10: lerp at t=1
+try:
+    red = mcrfpy.Color(255, 0, 0)
+    blue = mcrfpy.Color(0, 0, 255)
+    result = red.lerp(blue, 1.0)
+    assert result.r == 0 and result.g == 0 and result.b == 255, f"lerp(t=1) failed: {result}"
+    print("+ Color.lerp(t=1) returns end color")
+except Exception as e:
+    print(f"x Color.lerp(t=1) failed: {e}")
+    all_pass = False
+
+# Test 11: lerp at t=0.5
+try:
+    red = mcrfpy.Color(255, 0, 0)
+    blue = mcrfpy.Color(0, 0, 255)
+    result = red.lerp(blue, 0.5)
+    # Expect roughly (127, 0, 127)
+    assert 126 <= result.r <= 128 and result.g == 0 and 126 <= result.b <= 128, f"lerp(t=0.5) failed: {result}"
+    print("+ Color.lerp(t=0.5) returns midpoint")
+except Exception as e:
+    print(f"x Color.lerp(t=0.5) failed: {e}")
+    all_pass = False
+
+# Test 12: lerp with alpha
+try:
+    c1 = mcrfpy.Color(255, 0, 0, 255)
+    c2 = mcrfpy.Color(0, 255, 0, 0)
+    result = c1.lerp(c2, 0.5)
+    assert 126 <= result.r <= 128 and 126 <= result.g <= 128 and result.b == 0, f"lerp color components failed"
+    assert 126 <= result.a <= 128, f"lerp alpha failed: {result.a}"
+    print("+ Color.lerp() with alpha works")
+except Exception as e:
+    print(f"x Color.lerp() with alpha failed: {e}")
+    all_pass = False
+
+# Test 13: lerp clamps t < 0
+try:
+    red = mcrfpy.Color(255, 0, 0)
+    blue = mcrfpy.Color(0, 0, 255)
+    result = red.lerp(blue, -0.5)
+    assert result.r == 255 and result.g == 0 and result.b == 0, f"lerp(t<0) should clamp to 0"
+    print("+ Color.lerp() clamps t < 0")
+except Exception as e:
+    print(f"x Color.lerp(t<0) failed: {e}")
+    all_pass = False
+
+# Test 14: lerp clamps t > 1
+try:
+    red = mcrfpy.Color(255, 0, 0)
+    blue = mcrfpy.Color(0, 0, 255)
+    result = red.lerp(blue, 1.5)
+    assert result.r == 0 and result.g == 0 and result.b == 255, f"lerp(t>1) should clamp to 1"
+    print("+ Color.lerp() clamps t > 1")
+except Exception as e:
+    print(f"x Color.lerp(t>1) failed: {e}")
+    all_pass = False
+
+# Test 15: Practical use case - gradient
+try:
+    start = mcrfpy.Color.from_hex("#FF0000")  # Red
+    end = mcrfpy.Color.from_hex("#0000FF")    # Blue
+
+    # Create 5-step gradient
+    steps = []
+    for i in range(5):
+        t = i / 4.0
+        color = start.lerp(end, t)
+        steps.append(color.to_hex())
+
+    assert steps[0] == "#FF0000", "Gradient start should be red"
+    assert steps[4] == "#0000FF", "Gradient end should be blue"
+    assert len(set(steps)) == 5, "All gradient steps should be unique"
+
+    print("+ Gradient generation works correctly")
+except Exception as e:
+    print(f"x Gradient generation failed: {e}")
+    all_pass = False
+
+print(f"\n{'PASS' if all_pass else 'FAIL'}")
+sys.exit(0 if all_pass else 1)

tests/unit/test_empty_animation_manager.py

@@ -1,20 +1,28 @@
 #!/usr/bin/env python3
 """
 Test if AnimationManager crashes with no animations
+Refactored to use mcrfpy.step() for synchronous execution.
 """
 
 import mcrfpy
+import sys
 
 print("Creating empty scene...")
 test = mcrfpy.Scene("test")
 test.activate()
 
 print("Scene created, no animations added")
-print("Starting game loop in 100ms...")
+print("Advancing simulation with step()...")
 
-def check_alive(timer, runtime):
-    print(f"Timer fired at {runtime}ms - AnimationManager survived!")
-    mcrfpy.Timer("exit", lambda t, r: mcrfpy.exit(), 100, once=True)
+# Step multiple times to simulate game loop running
+# If AnimationManager crashes with empty state, this will fail
+try:
+    for i in range(10):
+        mcrfpy.step(0.1)  # 10 steps of 0.1s = 1 second simulated
 
-mcrfpy.Timer("check", check_alive, 1000, once=True)
-print("If this crashes immediately, AnimationManager has an issue with empty state")
+    print("AnimationManager survived 10 steps with no animations!")
+    print("PASS")
+    sys.exit(0)
+except Exception as e:
+    print(f"FAIL: AnimationManager crashed: {e}")
+    sys.exit(1)

tests/unit/test_frame_clipping.py

@@ -1,135 +1,118 @@
 #!/usr/bin/env python3
-"""Test UIFrame clipping functionality"""
+"""Test UIFrame clipping functionality
+Refactored to use mcrfpy.step() for synchronous execution.
+"""
 
 import mcrfpy
-from mcrfpy import Color, Frame, Caption
+from mcrfpy import Color, Frame, Caption, automation
 import sys
 
-# Module-level state to avoid closures
-_test_state = {}
-
-def take_second_screenshot(timer, runtime):
-    """Take final screenshot and exit"""
-    timer.stop()
-    from mcrfpy import automation
-    automation.screenshot("frame_clipping_animated.png")
-    print("\nTest completed successfully!")
-    print("Screenshots saved:")
-    print("  - frame_clipping_test.png (initial state)")
-    print("  - frame_clipping_animated.png (with animation)")
-    sys.exit(0)
-
-def animate_frames(timer, runtime):
-    """Animate frames to demonstrate clipping"""
-    timer.stop()
-    scene = test.children
-    # Move child frames
-    parent1 = scene[0]
-    parent2 = scene[1]
-    parent1.children[1].x = 50
-    parent2.children[1].x = 50
-    global screenshot2_timer
-    screenshot2_timer = mcrfpy.Timer("screenshot2", take_second_screenshot, 500, once=True)
-
-def test_clipping(timer, runtime):
-    """Test that clip_children property works correctly"""
-    timer.stop()
-
-    print("Testing UIFrame clipping functionality...")
-
-    scene = test.children
-
-    # Create parent frame with clipping disabled (default)
-    parent1 = Frame(pos=(50, 50), size=(200, 150),
-                   fill_color=Color(100, 100, 200),
-                   outline_color=Color(255, 255, 255),
-                   outline=2)
-    parent1.name = "parent1"
-    scene.append(parent1)
-
-    # Create parent frame with clipping enabled
-    parent2 = Frame(pos=(300, 50), size=(200, 150),
-                   fill_color=Color(200, 100, 100),
-                   outline_color=Color(255, 255, 255),
-                   outline=2)
-    parent2.name = "parent2"
-    parent2.clip_children = True
-    scene.append(parent2)
-
-    # Add captions to both frames
-    caption1 = Caption(text="This text should overflow the frame bounds", pos=(10, 10))
-    caption1.font_size = 16
-    caption1.fill_color = Color(255, 255, 255)
-    parent1.children.append(caption1)
-
-    caption2 = Caption(text="This text should be clipped to frame bounds", pos=(10, 10))
-    caption2.font_size = 16
-    caption2.fill_color = Color(255, 255, 255)
-    parent2.children.append(caption2)
-
-    # Add child frames that extend beyond parent bounds
-    child1 = Frame(pos=(150, 100), size=(100, 100),
-                   fill_color=Color(50, 255, 50),
-                   outline_color=Color(0, 0, 0),
-                   outline=1)
-    parent1.children.append(child1)
-
-    child2 = Frame(pos=(150, 100), size=(100, 100),
-                   fill_color=Color(50, 255, 50),
-                   outline_color=Color(0, 0, 0),
-                   outline=1)
-    parent2.children.append(child2)
-
-    # Add caption to show clip state
-    status = Caption(text=f"Left frame: clip_children={parent1.clip_children}\n"
-                          f"Right frame: clip_children={parent2.clip_children}",
-                     pos=(50, 250))
-    status.font_size = 14
-    status.fill_color = Color(255, 255, 255)
-    scene.append(status)
-
-    # Add instructions
-    instructions = Caption(text="Left: Children should overflow (no clipping)\n"
-                               "Right: Children should be clipped to frame bounds\n"
-                               "Press 'c' to toggle clipping on left frame",
-                          pos=(50, 300))
-    instructions.font_size = 12
-    instructions.fill_color = Color(200, 200, 200)
-    scene.append(instructions)
-
-    # Take screenshot
-    from mcrfpy import automation
-    automation.screenshot("frame_clipping_test.png")
-
-    print(f"Parent1 clip_children: {parent1.clip_children}")
-    print(f"Parent2 clip_children: {parent2.clip_children}")
-
-    # Test toggling clip_children
-    parent1.clip_children = True
-    print(f"After toggle - Parent1 clip_children: {parent1.clip_children}")
-
-    # Verify the property setter works
-    try:
-        parent1.clip_children = "not a bool"
-        print("ERROR: clip_children accepted non-boolean value")
-    except TypeError as e:
-        print(f"PASS: clip_children correctly rejected non-boolean: {e}")
-
-    # Start animation after a short delay
-    global animate_timer
-    animate_timer = mcrfpy.Timer("animate", animate_frames, 100, once=True)
-
-def handle_keypress(key, modifiers):
-    if key == "c":
-        scene = test.children
-        parent1 = scene[0]
-        parent1.clip_children = not parent1.clip_children
-        print(f"Toggled parent1 clip_children to: {parent1.clip_children}")
-
-# Main execution
 print("Creating test scene...")
 test = mcrfpy.Scene("test")
 test.activate()
-test.on_key = handle_keypress
-test_clipping_timer = mcrfpy.Timer("test_clipping", test_clipping, 100, once=True)
-print("Test scheduled, running...")
+mcrfpy.step(0.01)  # Initialize
+
+print("Testing UIFrame clipping functionality...")
+
+scene = test.children
+
+# Create parent frame with clipping disabled (default)
+parent1 = Frame(pos=(50, 50), size=(200, 150),
+               fill_color=Color(100, 100, 200),
+               outline_color=Color(255, 255, 255),
+               outline=2)
+parent1.name = "parent1"
+scene.append(parent1)
+
+# Create parent frame with clipping enabled
+parent2 = Frame(pos=(300, 50), size=(200, 150),
+               fill_color=Color(200, 100, 100),
+               outline_color=Color(255, 255, 255),
+               outline=2)
+parent2.name = "parent2"
+parent2.clip_children = True
+scene.append(parent2)
+
+# Add captions to both frames
+caption1 = Caption(text="This text should overflow the frame bounds", pos=(10, 10))
+caption1.font_size = 16
+caption1.fill_color = Color(255, 255, 255)
+parent1.children.append(caption1)
+
+caption2 = Caption(text="This text should be clipped to frame bounds", pos=(10, 10))
+caption2.font_size = 16
+caption2.fill_color = Color(255, 255, 255)
+parent2.children.append(caption2)
+
+# Add child frames that extend beyond parent bounds
+child1 = Frame(pos=(150, 100), size=(100, 100),
+               fill_color=Color(50, 255, 50),
+               outline_color=Color(0, 0, 0),
+               outline=1)
+parent1.children.append(child1)
+
+child2 = Frame(pos=(150, 100), size=(100, 100),
+               fill_color=Color(50, 255, 50),
+               outline_color=Color(0, 0, 0),
+               outline=1)
+parent2.children.append(child2)
+
+# Add caption to show clip state
+status = Caption(text=f"Left frame: clip_children={parent1.clip_children}\n"
+                      f"Right frame: clip_children={parent2.clip_children}",
+                 pos=(50, 250))
+status.font_size = 14
+status.fill_color = Color(255, 255, 255)
+scene.append(status)
+
+# Add instructions
+instructions = Caption(text="Left: Children should overflow (no clipping)\n"
+                           "Right: Children should be clipped to frame bounds",
+                      pos=(50, 300))
+instructions.font_size = 12
+instructions.fill_color = Color(200, 200, 200)
+scene.append(instructions)
+
+# Step to render
+mcrfpy.step(0.1)
+
+# Take screenshot
+automation.screenshot("frame_clipping_test.png")
+
+print(f"Parent1 clip_children: {parent1.clip_children}")
+print(f"Parent2 clip_children: {parent2.clip_children}")
+
+# Test toggling clip_children
+parent1.clip_children = True
+print(f"After toggle - Parent1 clip_children: {parent1.clip_children}")
+
+# Verify the property setter works
+test_passed = True
+try:
+    parent1.clip_children = "not a bool"
+    print("ERROR: clip_children accepted non-boolean value")
+    test_passed = False
+except TypeError as e:
+    print(f"PASS: clip_children correctly rejected non-boolean: {e}")
+
+# Animate frames (move children)
+parent1.children[1].x = 50
+parent2.children[1].x = 50
+
+# Step to render animation
+mcrfpy.step(0.1)
+
+# Take second screenshot
+automation.screenshot("frame_clipping_animated.png")
+
+print("\nTest completed successfully!")
+print("Screenshots saved:")
+print("  - frame_clipping_test.png (initial state)")
+print("  - frame_clipping_animated.png (with animation)")
+
+if test_passed:
+    print("PASS")
+    sys.exit(0)
+else:
+    print("FAIL")
+    sys.exit(1)

tests/unit/test_frame_clipping_advanced.py

@@ -1,105 +1,95 @@
 #!/usr/bin/env python3
-"""Advanced test for UIFrame clipping with nested frames"""
+"""Advanced test for UIFrame clipping with nested frames
+Refactored to use mcrfpy.step() for synchronous execution.
+"""
 
 import mcrfpy
-from mcrfpy import Color, Frame, Caption, Vector
+from mcrfpy import Color, Frame, Caption, Vector, automation
 import sys
 
-def test_nested_clipping(timer, runtime):
-    """Test nested frames with clipping"""
-    timer.stop()
-    
-    print("Testing advanced UIFrame clipping with nested frames...")
-    
-    # Create test scene
-    scene = test.children
-    
-    # Create outer frame with clipping enabled
-    outer = Frame(pos=(50, 50), size=(400, 300),
-                  fill_color=Color(50, 50, 150),
-                  outline_color=Color(255, 255, 255),
-                  outline=3)
-    outer.name = "outer"
-    outer.clip_children = True
-    scene.append(outer)
-
-    # Create inner frame that extends beyond outer bounds
-    inner = Frame(pos=(200, 150), size=(300, 200),
-                  fill_color=Color(150, 50, 50),
-                  outline_color=Color(255, 255, 0),
-                  outline=2)
-    inner.name = "inner"
-    inner.clip_children = True  # Also enable clipping on inner frame
-    outer.children.append(inner)
-    
-    # Add content to inner frame that extends beyond its bounds
-    for i in range(5):
-        caption = Caption(text=f"Line {i+1}: This text should be double-clipped", pos=(10, 30 * i))
-        caption.font_size = 14
-        caption.fill_color = Color(255, 255, 255)
-        inner.children.append(caption)
-    
-    # Add a child frame to inner that extends way out
-    deeply_nested = Frame(pos=(250, 100), size=(200, 150),
-                         fill_color=Color(50, 150, 50),
-                         outline_color=Color(255, 0, 255),
-                         outline=2)
-    deeply_nested.name = "deeply_nested"
-    inner.children.append(deeply_nested)
-    
-    # Add status text
-    status = Caption(text="Nested clipping test:\n"
-                         "- Blue outer frame clips red inner frame\n"
-                         "- Red inner frame clips green deeply nested frame\n"
-                         "- All text should be clipped to frame bounds",
-                    pos=(50, 380))
-    status.font_size = 12
-    status.fill_color = Color(200, 200, 200)
-    scene.append(status)
-    
-    # Test render texture size handling
-    print(f"Outer frame size: {outer.w}x{outer.h}")
-    print(f"Inner frame size: {inner.w}x{inner.h}")
-    
-    # Dynamically resize frames to test RenderTexture recreation
-    def resize_test(timer, runtime):
-        timer.stop()
-        print("Resizing frames to test RenderTexture recreation...")
-        outer.w = 450
-        outer.h = 350
-        inner.w = 350
-        inner.h = 250
-        print(f"New outer frame size: {outer.w}x{outer.h}")
-        print(f"New inner frame size: {inner.w}x{inner.h}")
-
-        # Take screenshot after resize
-        global screenshot_resize_timer
-        screenshot_resize_timer = mcrfpy.Timer("screenshot_resize", take_resize_screenshot, 500, once=True)
-
-    def take_resize_screenshot(timer, runtime):
-        timer.stop()
-        from mcrfpy import automation
-        automation.screenshot("frame_clipping_resized.png")
-        print("\nAdvanced test completed!")
-        print("Screenshots saved:")
-        print("  - frame_clipping_resized.png (after resize)")
-        sys.exit(0)
-    
-    # Take initial screenshot
-    from mcrfpy import automation
-    automation.screenshot("frame_clipping_nested.png")
-    print("Initial screenshot saved: frame_clipping_nested.png")
-
-    # Schedule resize test
-    global resize_test_timer
-    resize_test_timer = mcrfpy.Timer("resize_test", resize_test, 1000, once=True)
-
-# Main execution
 print("Creating advanced test scene...")
 test = mcrfpy.Scene("test")
 test.activate()
+mcrfpy.step(0.01)
 
-# Schedule the test
-test_nested_clipping_timer = mcrfpy.Timer("test_nested_clipping", test_nested_clipping, 100, once=True)
+print("Testing advanced UIFrame clipping with nested frames...")
 
-print("Advanced test scheduled, running...")
+# Create test scene
+scene = test.children
+
+# Create outer frame with clipping enabled
+outer = Frame(pos=(50, 50), size=(400, 300),
+              fill_color=Color(50, 50, 150),
+              outline_color=Color(255, 255, 255),
+              outline=3)
+outer.name = "outer"
+outer.clip_children = True
+scene.append(outer)
+
+# Create inner frame that extends beyond outer bounds
+inner = Frame(pos=(200, 150), size=(300, 200),
+              fill_color=Color(150, 50, 50),
+              outline_color=Color(255, 255, 0),
+              outline=2)
+inner.name = "inner"
+inner.clip_children = True  # Also enable clipping on inner frame
+outer.children.append(inner)
+
+# Add content to inner frame that extends beyond its bounds
+for i in range(5):
+    caption = Caption(text=f"Line {i+1}: This text should be double-clipped", pos=(10, 30 * i))
+    caption.font_size = 14
+    caption.fill_color = Color(255, 255, 255)
+    inner.children.append(caption)
+
+# Add a child frame to inner that extends way out
+deeply_nested = Frame(pos=(250, 100), size=(200, 150),
+                     fill_color=Color(50, 150, 50),
+                     outline_color=Color(255, 0, 255),
+                     outline=2)
+deeply_nested.name = "deeply_nested"
+inner.children.append(deeply_nested)
+
+# Add status text
+status = Caption(text="Nested clipping test:\n"
+                     "- Blue outer frame clips red inner frame\n"
+                     "- Red inner frame clips green deeply nested frame\n"
+                     "- All text should be clipped to frame bounds",
+                pos=(50, 380))
+status.font_size = 12
+status.fill_color = Color(200, 200, 200)
+scene.append(status)
+
+# Test render texture size handling
+print(f"Outer frame size: {outer.w}x{outer.h}")
+print(f"Inner frame size: {inner.w}x{inner.h}")
+
+# Step to render
+mcrfpy.step(0.1)
+
+# Take initial screenshot
+automation.screenshot("frame_clipping_nested.png")
+print("Initial screenshot saved: frame_clipping_nested.png")
+
+# Dynamically resize frames to test RenderTexture recreation
+print("Resizing frames to test RenderTexture recreation...")
+outer.w = 450
+outer.h = 350
+inner.w = 350
+inner.h = 250
+print(f"New outer frame size: {outer.w}x{outer.h}")
+print(f"New inner frame size: {inner.w}x{inner.h}")
+
+# Step to render resize
+mcrfpy.step(0.1)
+
+# Take screenshot after resize
+automation.screenshot("frame_clipping_resized.png")
+
+print("\nAdvanced test completed!")
+print("Screenshots saved:")
+print("  - frame_clipping_nested.png (initial)")
+print("  - frame_clipping_resized.png (after resize)")
+
+print("PASS")
+sys.exit(0)

tests/unit/test_grid_children.py

@@ -1,129 +1,125 @@
 #!/usr/bin/env python3
-"""Test Grid.children collection - Issue #132"""
+"""Test Grid.children collection - Issue #132
+Refactored to use mcrfpy.step() for synchronous execution.
+"""
 import mcrfpy
 from mcrfpy import automation
 import sys
 
-def take_screenshot(timer, runtime):
-    """Take screenshot after render completes"""
-    timer.stop()
-    automation.screenshot("test_grid_children_result.png")
-
-    print("Screenshot saved to test_grid_children_result.png")
-    print("PASS - Grid.children test completed")
-    sys.exit(0)
-
-def run_test(timer, runtime):
-    """Main test - runs after scene is set up"""
-    timer.stop()
-
-    # Get the scene UI
-    ui = test.children
-
-    # Create a grid without texture (uses default 16x16 cells)
-    print("Test 1: Creating Grid with children...")
-    grid = mcrfpy.Grid(grid_size=(20, 15), pos=(50, 50), size=(320, 240))
-    grid.fill_color = mcrfpy.Color(30, 30, 60)
-    ui.append(grid)
-
-    # Verify entities and children properties exist
-    print(f"  grid.entities = {grid.entities}")
-    print(f"  grid.children = {grid.children}")
-
-    # Test 2: Add UIDrawable children to the grid
-    print("\nTest 2: Adding UIDrawable children...")
-
-    # Speech bubble style caption - positioned in grid-world pixels
-    # At cell (5, 3) which is 5*16=80, 3*16=48 in pixels
-    caption = mcrfpy.Caption(text="Hello!", pos=(80, 48))
-    caption.fill_color = mcrfpy.Color(255, 255, 200)
-    caption.outline = 1
-    caption.outline_color = mcrfpy.Color(0, 0, 0)
-    grid.children.append(caption)
-    print(f"  Added caption at (80, 48)")
-
-    # A highlight circle around cell (10, 7) = (160, 112)
-    # Circle needs center, not pos
-    circle = mcrfpy.Circle(center=(168, 120), radius=20,
-                           fill_color=mcrfpy.Color(255, 255, 0, 100),
-                           outline_color=mcrfpy.Color(255, 255, 0),
-                           outline=2)
-    grid.children.append(circle)
-    print(f"  Added highlight circle at (168, 120)")
-
-    # A line indicating a path from (2,2) to (8,6)
-    # In pixels: (32, 32) to (128, 96)
-    line = mcrfpy.Line(start=(32, 32), end=(128, 96),
-                       color=mcrfpy.Color(0, 255, 0), thickness=3)
-    grid.children.append(line)
-    print(f"  Added path line from (32,32) to (128,96)")
-
-    # An arc for range indicator at (15, 10) = (240, 160)
-    arc = mcrfpy.Arc(center=(240, 160), radius=40, start_angle=0, end_angle=270,
-                     color=mcrfpy.Color(255, 0, 255), thickness=4)
-    grid.children.append(arc)
-    print(f"  Added range arc at (240, 160)")
-
-    # Test 3: Verify children count
-    print(f"\nTest 3: Verifying children count...")
-    print(f"  grid.children count = {len(grid.children)}")
-    assert len(grid.children) == 4, f"Expected 4 children, got {len(grid.children)}"
-
-    # Test 4: Children should be accessible by index
-    print("\nTest 4: Accessing children by index...")
-    child0 = grid.children[0]
-    print(f"  grid.children[0] = {child0}")
-    child1 = grid.children[1]
-    print(f"  grid.children[1] = {child1}")
-
-    # Test 5: Modify a child's position (should update in grid)
-    print("\nTest 5: Modifying child position...")
-    original_pos = (caption.pos.x, caption.pos.y)
-    caption.pos = mcrfpy.Vector(90, 58)
-    new_pos = (caption.pos.x, caption.pos.y)
-    print(f"  Moved caption from {original_pos} to {new_pos}")
-
-    # Test 6: Test z_index for children
-    print("\nTest 6: Testing z_index ordering...")
-    # Add overlapping elements with different z_index
-    frame1 = mcrfpy.Frame(pos=(150, 80), size=(40, 40))
-    frame1.fill_color = mcrfpy.Color(255, 0, 0, 200)
-    frame1.z_index = 10
-    grid.children.append(frame1)
-
-    frame2 = mcrfpy.Frame(pos=(160, 90), size=(40, 40))
-    frame2.fill_color = mcrfpy.Color(0, 255, 0, 200)
-    frame2.z_index = 5  # Lower z_index, rendered first (behind)
-    grid.children.append(frame2)
-    print(f"  Added overlapping frames: red z=10, green z=5")
-
-    # Test 7: Test visibility
-    print("\nTest 7: Testing child visibility...")
-    frame3 = mcrfpy.Frame(pos=(50, 150), size=(30, 30))
-    frame3.fill_color = mcrfpy.Color(0, 0, 255)
-    frame3.visible = False
-    grid.children.append(frame3)
-    print(f"  Added invisible blue frame (should not appear)")
-
-    # Test 8: Pan the grid and verify children move with it
-    print("\nTest 8: Testing pan (children should follow grid camera)...")
-    # Center the view on cell (10, 7.5) - default was grid center
-    grid.center = (160, 120)  # Center on pixel (160, 120)
-    print(f"  Centered grid on (160, 120)")
-
-    # Test 9: Test zoom
-    print("\nTest 9: Testing zoom...")
-    grid.zoom = 1.5
-    print(f"  Set zoom to 1.5")
-
-    print(f"\nFinal children count: {len(grid.children)}")
-
-    # Schedule screenshot for next frame
-    mcrfpy.Timer("screenshot", take_screenshot, 100, once=True)
-
-# Create a test scene
+print("Creating test scene...")
 test = mcrfpy.Scene("test")
 test.activate()
+mcrfpy.step(0.01)  # Initialize
 
-# Schedule test to run after game loop starts
-mcrfpy.Timer("test", run_test, 50, once=True)
+# Get the scene UI
+ui = test.children
+
+# Test 1: Creating Grid with children
+print("Test 1: Creating Grid with children...")
+grid = mcrfpy.Grid(grid_size=(20, 15), pos=(50, 50), size=(320, 240))
+grid.fill_color = mcrfpy.Color(30, 30, 60)
+ui.append(grid)
+
+# Verify entities and children properties exist
+print(f"  grid.entities = {grid.entities}")
+print(f"  grid.children = {grid.children}")
+
+# Test 2: Add UIDrawable children to the grid
+print("\nTest 2: Adding UIDrawable children...")
+
+# Speech bubble style caption - positioned in grid-world pixels
+# At cell (5, 3) which is 5*16=80, 3*16=48 in pixels
+caption = mcrfpy.Caption(text="Hello!", pos=(80, 48))
+caption.fill_color = mcrfpy.Color(255, 255, 200)
+caption.outline = 1
+caption.outline_color = mcrfpy.Color(0, 0, 0)
+grid.children.append(caption)
+print(f"  Added caption at (80, 48)")
+
+# A highlight circle around cell (10, 7) = (160, 112)
+# Circle needs center, not pos
+circle = mcrfpy.Circle(center=(168, 120), radius=20,
+                       fill_color=mcrfpy.Color(255, 255, 0, 100),
+                       outline_color=mcrfpy.Color(255, 255, 0),
+                       outline=2)
+grid.children.append(circle)
+print(f"  Added highlight circle at (168, 120)")
+
+# A line indicating a path from (2,2) to (8,6)
+# In pixels: (32, 32) to (128, 96)
+line = mcrfpy.Line(start=(32, 32), end=(128, 96),
+                   color=mcrfpy.Color(0, 255, 0), thickness=3)
+grid.children.append(line)
+print(f"  Added path line from (32,32) to (128,96)")
+
+# An arc for range indicator at (15, 10) = (240, 160)
+arc = mcrfpy.Arc(center=(240, 160), radius=40, start_angle=0, end_angle=270,
+                 color=mcrfpy.Color(255, 0, 255), thickness=4)
+grid.children.append(arc)
+print(f"  Added range arc at (240, 160)")
+
+# Test 3: Verify children count
+print(f"\nTest 3: Verifying children count...")
+print(f"  grid.children count = {len(grid.children)}")
+if len(grid.children) != 4:
+    print(f"FAIL: Expected 4 children, got {len(grid.children)}")
+    sys.exit(1)
+
+# Test 4: Children should be accessible by index
+print("\nTest 4: Accessing children by index...")
+child0 = grid.children[0]
+print(f"  grid.children[0] = {child0}")
+child1 = grid.children[1]
+print(f"  grid.children[1] = {child1}")
+
+# Test 5: Modify a child's position (should update in grid)
+print("\nTest 5: Modifying child position...")
+original_pos = (caption.pos.x, caption.pos.y)
+caption.pos = mcrfpy.Vector(90, 58)
+new_pos = (caption.pos.x, caption.pos.y)
+print(f"  Moved caption from {original_pos} to {new_pos}")
+
+# Test 6: Test z_index for children
+print("\nTest 6: Testing z_index ordering...")
+# Add overlapping elements with different z_index
+frame1 = mcrfpy.Frame(pos=(150, 80), size=(40, 40))
+frame1.fill_color = mcrfpy.Color(255, 0, 0, 200)
+frame1.z_index = 10
+grid.children.append(frame1)
+
+frame2 = mcrfpy.Frame(pos=(160, 90), size=(40, 40))
+frame2.fill_color = mcrfpy.Color(0, 255, 0, 200)
+frame2.z_index = 5  # Lower z_index, rendered first (behind)
+grid.children.append(frame2)
+print(f"  Added overlapping frames: red z=10, green z=5")
+
+# Test 7: Test visibility
+print("\nTest 7: Testing child visibility...")
+frame3 = mcrfpy.Frame(pos=(50, 150), size=(30, 30))
+frame3.fill_color = mcrfpy.Color(0, 0, 255)
+frame3.visible = False
+grid.children.append(frame3)
+print(f"  Added invisible blue frame (should not appear)")
+
+# Test 8: Pan the grid and verify children move with it
+print("\nTest 8: Testing pan (children should follow grid camera)...")
+# Center the view on cell (10, 7.5) - default was grid center
+grid.center = (160, 120)  # Center on pixel (160, 120)
+print(f"  Centered grid on (160, 120)")
+
+# Test 9: Test zoom
+print("\nTest 9: Testing zoom...")
+grid.zoom = 1.5
+print(f"  Set zoom to 1.5")
+
+print(f"\nFinal children count: {len(grid.children)}")
+
+# Step to render everything
+mcrfpy.step(0.1)
+
+# Take screenshot
+automation.screenshot("test_grid_children_result.png")
+print("Screenshot saved to test_grid_children_result.png")
+
+print("PASS - Grid.children test completed")
+sys.exit(0)

tests/unit/test_no_arg_constructors.py

@@ -2,90 +2,94 @@
 """
 Test that all UI classes can be instantiated without arguments.
 This verifies the fix for requiring arguments even with safe default constructors.
+Refactored to use mcrfpy.step() for synchronous execution.
 """
 
 import mcrfpy
 import sys
+import traceback
 
-def test_ui_constructors(timer, runtime):
-    """Test that UI classes can be instantiated without arguments"""
-    
-    print("Testing UI class instantiation without arguments...")
-    
-    # Test UICaption with no arguments
-    try:
-        caption = mcrfpy.Caption()
-        print("PASS: Caption() - Success")
-        print(f"      Position: ({caption.x}, {caption.y})")
-        print(f"      Text: '{caption.text}'")
-        assert caption.x == 0.0
-        assert caption.y == 0.0
-        assert caption.text == ""
-    except Exception as e:
-        print(f"FAIL: Caption() - {e}")
-        import traceback
-        traceback.print_exc()
-    
-    # Test UIFrame with no arguments
-    try:
-        frame = mcrfpy.Frame()
-        print("PASS: Frame() - Success")
-        print(f"      Position: ({frame.x}, {frame.y})")
-        print(f"      Size: ({frame.w}, {frame.h})")
-        assert frame.x == 0.0
-        assert frame.y == 0.0
-        assert frame.w == 0.0
-        assert frame.h == 0.0
-    except Exception as e:
-        print(f"FAIL: Frame() - {e}")
-        import traceback
-        traceback.print_exc()
-    
-    # Test UIGrid with no arguments
-    try:
-        grid = mcrfpy.Grid()
-        print("PASS: Grid() - Success")
-        print(f"      Grid size: {grid.grid_x} x {grid.grid_y}")
-        print(f"      Position: ({grid.x}, {grid.y})")
-        assert grid.grid_x == 1
-        assert grid.grid_y == 1
-        assert grid.x == 0.0
-        assert grid.y == 0.0
-    except Exception as e:
-        print(f"FAIL: Grid() - {e}")
-        import traceback
-        traceback.print_exc()
-    
-    # Test UIEntity with no arguments
-    try:
-        entity = mcrfpy.Entity()
-        print("PASS: Entity() - Success")
-        print(f"      Position: ({entity.x}, {entity.y})")
-        assert entity.x == 0.0
-        assert entity.y == 0.0
-    except Exception as e:
-        print(f"FAIL: Entity() - {e}")
-        import traceback
-        traceback.print_exc()
-    
-    # Test UISprite with no arguments (if it has a default constructor)
-    try:
-        sprite = mcrfpy.Sprite()
-        print("PASS: Sprite() - Success")
-        print(f"      Position: ({sprite.x}, {sprite.y})")
-        assert sprite.x == 0.0
-        assert sprite.y == 0.0
-    except Exception as e:
-        print(f"FAIL: Sprite() - {e}")
-        # Sprite might still require arguments, which is okay
-    
-    print("\nAll tests complete!")
-    
-    # Exit cleanly
-    sys.exit(0)
-
-# Create a basic scene so the game can start
+# Initialize scene
 test = mcrfpy.Scene("test")
+test.activate()
+mcrfpy.step(0.01)
 
-# Schedule the test to run after game initialization
-test_timer = mcrfpy.Timer("test", test_ui_constructors, 100, once=True)
+print("Testing UI class instantiation without arguments...")
+
+all_pass = True
+
+# Test UICaption with no arguments
+try:
+    caption = mcrfpy.Caption()
+    print("PASS: Caption() - Success")
+    print(f"      Position: ({caption.x}, {caption.y})")
+    print(f"      Text: '{caption.text}'")
+    assert caption.x == 0.0
+    assert caption.y == 0.0
+    assert caption.text == ""
+except Exception as e:
+    print(f"FAIL: Caption() - {e}")
+    traceback.print_exc()
+    all_pass = False
+
+# Test UIFrame with no arguments
+try:
+    frame = mcrfpy.Frame()
+    print("PASS: Frame() - Success")
+    print(f"      Position: ({frame.x}, {frame.y})")
+    print(f"      Size: ({frame.w}, {frame.h})")
+    assert frame.x == 0.0
+    assert frame.y == 0.0
+    assert frame.w == 0.0
+    assert frame.h == 0.0
+except Exception as e:
+    print(f"FAIL: Frame() - {e}")
+    traceback.print_exc()
+    all_pass = False
+
+# Test UIGrid with no arguments
+try:
+    grid = mcrfpy.Grid()
+    print("PASS: Grid() - Success")
+    print(f"      Grid size: {grid.grid_x} x {grid.grid_y}")
+    print(f"      Position: ({grid.x}, {grid.y})")
+    assert grid.grid_x == 1
+    assert grid.grid_y == 1
+    assert grid.x == 0.0
+    assert grid.y == 0.0
+except Exception as e:
+    print(f"FAIL: Grid() - {e}")
+    traceback.print_exc()
+    all_pass = False
+
+# Test UIEntity with no arguments
+try:
+    entity = mcrfpy.Entity()
+    print("PASS: Entity() - Success")
+    print(f"      Position: ({entity.x}, {entity.y})")
+    assert entity.x == 0.0
+    assert entity.y == 0.0
+except Exception as e:
+    print(f"FAIL: Entity() - {e}")
+    traceback.print_exc()
+    all_pass = False
+
+# Test UISprite with no arguments (if it has a default constructor)
+try:
+    sprite = mcrfpy.Sprite()
+    print("PASS: Sprite() - Success")
+    print(f"      Position: ({sprite.x}, {sprite.y})")
+    assert sprite.x == 0.0
+    assert sprite.y == 0.0
+except Exception as e:
+    print(f"FAIL: Sprite() - {e}")
+    # Sprite might still require arguments, which is okay
+
+print("\nAll tests complete!")
+
+if all_pass:
+    print("PASS")
+    sys.exit(0)
+else:
+    print("FAIL")
+    sys.exit(1)

tests/unit/test_properties_quick.py

@@ -1,57 +1,67 @@
 #!/usr/bin/env python3
-"""Quick test of drawable properties"""
+"""Quick test of drawable properties
+Refactored to use mcrfpy.step() for synchronous execution.
+"""
 import mcrfpy
 import sys
 
-def test_properties(timer, runtime):
-    timer.stop()
-    
-    print("\n=== Testing Properties ===")
-    
-    # Test Frame
-    try:
-        frame = mcrfpy.Frame(pos=(10, 10), size=(100, 100))
-        print(f"Frame visible: {frame.visible}")
-        frame.visible = False
-        print(f"Frame visible after setting to False: {frame.visible}")
-        
-        print(f"Frame opacity: {frame.opacity}")
-        frame.opacity = 0.5
-        print(f"Frame opacity after setting to 0.5: {frame.opacity}")
-        
-        bounds = frame.get_bounds()
-        print(f"Frame bounds: {bounds}")
-        
-        frame.move(5, 5)
-        bounds2 = frame.get_bounds()
-        print(f"Frame bounds after move(5,5): {bounds2}")
-        
-        print("✓ Frame properties work!")
-    except Exception as e:
-        print(f"✗ Frame failed: {e}")
-    
-    # Test Entity
-    try:
-        entity = mcrfpy.Entity()
-        print(f"\nEntity visible: {entity.visible}")
-        entity.visible = False
-        print(f"Entity visible after setting to False: {entity.visible}")
-        
-        print(f"Entity opacity: {entity.opacity}")
-        entity.opacity = 0.7
-        print(f"Entity opacity after setting to 0.7: {entity.opacity}")
-        
-        bounds = entity.get_bounds()
-        print(f"Entity bounds: {bounds}")
-        
-        entity.move(3, 3)
-        print(f"Entity position after move(3,3): ({entity.x}, {entity.y})")
-        
-        print("✓ Entity properties work!")
-    except Exception as e:
-        print(f"✗ Entity failed: {e}")
-    
-    sys.exit(0)
-
+# Initialize scene
 test = mcrfpy.Scene("test")
-test_properties_timer = mcrfpy.Timer("test_properties", test_properties, 100, once=True)
+test.activate()
+mcrfpy.step(0.01)
+
+print("\n=== Testing Properties ===")
+
+all_pass = True
+
+# Test Frame
+try:
+    frame = mcrfpy.Frame(pos=(10, 10), size=(100, 100))
+    print(f"Frame visible: {frame.visible}")
+    frame.visible = False
+    print(f"Frame visible after setting to False: {frame.visible}")
+
+    print(f"Frame opacity: {frame.opacity}")
+    frame.opacity = 0.5
+    print(f"Frame opacity after setting to 0.5: {frame.opacity}")
+
+    bounds = frame.get_bounds()
+    print(f"Frame bounds: {bounds}")
+
+    frame.move(5, 5)
+    bounds2 = frame.get_bounds()
+    print(f"Frame bounds after move(5,5): {bounds2}")
+
+    print("+ Frame properties work!")
+except Exception as e:
+    print(f"x Frame failed: {e}")
+    all_pass = False
+
+# Test Entity
+try:
+    entity = mcrfpy.Entity()
+    print(f"\nEntity visible: {entity.visible}")
+    entity.visible = False
+    print(f"Entity visible after setting to False: {entity.visible}")
+
+    print(f"Entity opacity: {entity.opacity}")
+    entity.opacity = 0.7
+    print(f"Entity opacity after setting to 0.7: {entity.opacity}")
+
+    bounds = entity.get_bounds()
+    print(f"Entity bounds: {bounds}")
+
+    entity.move(3, 3)
+    print(f"Entity position after move(3,3): ({entity.x}, {entity.y})")
+
+    print("+ Entity properties work!")
+except Exception as e:
+    print(f"x Entity failed: {e}")
+    all_pass = False
+
+if all_pass:
+    print("\nPASS")
+    sys.exit(0)
+else:
+    print("\nFAIL")
+    sys.exit(1)

tests/unit/test_python_object_cache.py

@@ -4,6 +4,7 @@ Test for Python object cache - verifies that derived Python classes
 maintain their identity when stored in and retrieved from collections.
 
 Issue #112: Object Splitting - Preserve Python derived types in collections
+Refactored to use mcrfpy.step() for synchronous execution.
 """
 
 import mcrfpy
@@ -16,136 +17,128 @@ test_results = []
 def test(condition, message):
     global test_passed
     if condition:
-        test_results.append(f"✓ {message}")
+        test_results.append(f"+ {message}")
     else:
-        test_results.append(f"✗ {message}")
+        test_results.append(f"x {message}")
         test_passed = False
 
-def run_tests(timer, runtime):
-    """Timer callback to run tests after game loop starts"""
-    global test_passed
-    
-    print("\n=== Testing Python Object Cache ===")
-    
-    # Test 1: Create derived Frame class
-    class MyFrame(mcrfpy.Frame):
-        def __init__(self, x=0, y=0):
-            super().__init__(pos=(x, y), size=(100, 100))
-            self.custom_data = "I am a custom frame"
-            self.test_value = 42
-    
-    # Test 2: Create instance and add to scene
-    frame = MyFrame(50, 50)
-    scene_ui = test_scene.children
-    scene_ui.append(frame)
-    
-    # Test 3: Retrieve from collection and check type
-    retrieved = scene_ui[0]
-    test(type(retrieved) == MyFrame, "Retrieved object maintains derived type")
-    test(isinstance(retrieved, MyFrame), "isinstance check passes")
-    test(hasattr(retrieved, 'custom_data'), "Custom attribute exists")
-    if hasattr(retrieved, 'custom_data'):
-        test(retrieved.custom_data == "I am a custom frame", "Custom attribute value preserved")
-    if hasattr(retrieved, 'test_value'):
-        test(retrieved.test_value == 42, "Numeric attribute value preserved")
-    
-    # Test 4: Check object identity (same Python object)
-    test(retrieved is frame, "Retrieved object is the same Python object")
-    test(id(retrieved) == id(frame), "Object IDs match")
-    
-    # Test 5: Multiple retrievals return same object
-    retrieved2 = scene_ui[0]
-    test(retrieved2 is retrieved, "Multiple retrievals return same object")
-    
-    # Test 6: Test with other UI types
-    class MySprite(mcrfpy.Sprite):
-        def __init__(self):
-            # Use default texture by passing None
-            super().__init__(texture=None, sprite_index=0)
-            self.sprite_data = "custom sprite"
-    
-    sprite = MySprite()
-    sprite.x = 200
-    sprite.y = 200
-    scene_ui.append(sprite)
-    
-    retrieved_sprite = scene_ui[1]
-    test(type(retrieved_sprite) == MySprite, "Sprite maintains derived type")
-    if hasattr(retrieved_sprite, 'sprite_data'):
-        test(retrieved_sprite.sprite_data == "custom sprite", "Sprite custom data preserved")
-    
-    # Test 7: Test with Caption
-    class MyCaption(mcrfpy.Caption):
-        def __init__(self, text):
-            # Use default font by passing None
-            super().__init__(text=text, font=None)
-            self.caption_id = "test_caption"
-    
-    caption = MyCaption("Test Caption")
-    caption.x = 10
-    caption.y = 10
-    scene_ui.append(caption)
-    
-    retrieved_caption = scene_ui[2]
-    test(type(retrieved_caption) == MyCaption, "Caption maintains derived type")
-    if hasattr(retrieved_caption, 'caption_id'):
-        test(retrieved_caption.caption_id == "test_caption", "Caption custom data preserved")
-    
-    # Test 8: Test removal and re-addition
-    # Use del to remove by index (Python standard), or .remove(element) to remove by value
-    print(f"before remove: {len(scene_ui)=}")
-    del scene_ui[-1]  # Remove last element by index
-    print(f"after remove: {len(scene_ui)=}")
-
-    scene_ui.append(frame)
-    retrieved3 = scene_ui[-1]  # Get last element
-    test(retrieved3 is frame, "Object identity preserved after removal/re-addition")
-    
-    # Test 9: Test with Grid
-    class MyGrid(mcrfpy.Grid):
-        def __init__(self, w, h):
-            super().__init__(grid_size=(w, h))
-            self.grid_name = "custom_grid"
-    
-    grid = MyGrid(10, 10)
-    grid.x = 300
-    grid.y = 100
-    scene_ui.append(grid)
-    
-    retrieved_grid = scene_ui[-1]
-    test(type(retrieved_grid) == MyGrid, "Grid maintains derived type")
-    if hasattr(retrieved_grid, 'grid_name'):
-        test(retrieved_grid.grid_name == "custom_grid", "Grid custom data preserved")
-    
-    # Test 10: Test with nested collections (Frame with children)
-    parent = MyFrame(400, 400)
-    child = MyFrame(10, 10)
-    child.custom_data = "I am a child"
-    parent.children.append(child)
-    scene_ui.append(parent)
-    
-    retrieved_parent = scene_ui[-1]
-    test(type(retrieved_parent) == MyFrame, "Parent frame maintains type")
-    if len(retrieved_parent.children) > 0:
-        retrieved_child = retrieved_parent.children[0]
-        test(type(retrieved_child) == MyFrame, "Child frame maintains type in nested collection")
-        if hasattr(retrieved_child, 'custom_data'):
-            test(retrieved_child.custom_data == "I am a child", "Child custom data preserved")
-    
-    # Print results
-    print("\n=== Test Results ===")
-    for result in test_results:
-        print(result)
-    
-    print(f"\n{'PASS' if test_passed else 'FAIL'}: {sum(1 for r in test_results if r.startswith('✓'))}/{len(test_results)} tests passed")
-    
-    sys.exit(0 if test_passed else 1)
-
 # Create test scene
 test_scene = mcrfpy.Scene("test_scene")
 test_scene.activate()
+mcrfpy.step(0.01)
 
-# Schedule tests to run after game loop starts
-test_timer = mcrfpy.Timer("test", run_tests, 100, once=True)
+print("\n=== Testing Python Object Cache ===")
 
-print("Python object cache test initialized. Running tests...")
+# Test 1: Create derived Frame class
+class MyFrame(mcrfpy.Frame):
+    def __init__(self, x=0, y=0):
+        super().__init__(pos=(x, y), size=(100, 100))
+        self.custom_data = "I am a custom frame"
+        self.test_value = 42
+
+# Test 2: Create instance and add to scene
+frame = MyFrame(50, 50)
+scene_ui = test_scene.children
+scene_ui.append(frame)
+
+# Test 3: Retrieve from collection and check type
+retrieved = scene_ui[0]
+test(type(retrieved) == MyFrame, "Retrieved object maintains derived type")
+test(isinstance(retrieved, MyFrame), "isinstance check passes")
+test(hasattr(retrieved, 'custom_data'), "Custom attribute exists")
+if hasattr(retrieved, 'custom_data'):
+    test(retrieved.custom_data == "I am a custom frame", "Custom attribute value preserved")
+if hasattr(retrieved, 'test_value'):
+    test(retrieved.test_value == 42, "Numeric attribute value preserved")
+
+# Test 4: Check object identity (same Python object)
+test(retrieved is frame, "Retrieved object is the same Python object")
+test(id(retrieved) == id(frame), "Object IDs match")
+
+# Test 5: Multiple retrievals return same object
+retrieved2 = scene_ui[0]
+test(retrieved2 is retrieved, "Multiple retrievals return same object")
+
+# Test 6: Test with other UI types
+class MySprite(mcrfpy.Sprite):
+    def __init__(self):
+        # Use default texture by passing None
+        super().__init__(texture=None, sprite_index=0)
+        self.sprite_data = "custom sprite"
+
+sprite = MySprite()
+sprite.x = 200
+sprite.y = 200
+scene_ui.append(sprite)
+
+retrieved_sprite = scene_ui[1]
+test(type(retrieved_sprite) == MySprite, "Sprite maintains derived type")
+if hasattr(retrieved_sprite, 'sprite_data'):
+    test(retrieved_sprite.sprite_data == "custom sprite", "Sprite custom data preserved")
+
+# Test 7: Test with Caption
+class MyCaption(mcrfpy.Caption):
+    def __init__(self, text):
+        # Use default font by passing None
+        super().__init__(text=text, font=None)
+        self.caption_id = "test_caption"
+
+caption = MyCaption("Test Caption")
+caption.x = 10
+caption.y = 10
+scene_ui.append(caption)
+
+retrieved_caption = scene_ui[2]
+test(type(retrieved_caption) == MyCaption, "Caption maintains derived type")
+if hasattr(retrieved_caption, 'caption_id'):
+    test(retrieved_caption.caption_id == "test_caption", "Caption custom data preserved")
+
+# Test 8: Test removal and re-addition
+# Use del to remove by index (Python standard), or .remove(element) to remove by value
+print(f"before remove: {len(scene_ui)=}")
+del scene_ui[-1]  # Remove last element by index
+print(f"after remove: {len(scene_ui)=}")
+
+scene_ui.append(frame)
+retrieved3 = scene_ui[-1]  # Get last element
+test(retrieved3 is frame, "Object identity preserved after removal/re-addition")
+
+# Test 9: Test with Grid
+class MyGrid(mcrfpy.Grid):
+    def __init__(self, w, h):
+        super().__init__(grid_size=(w, h))
+        self.grid_name = "custom_grid"
+
+grid = MyGrid(10, 10)
+grid.x = 300
+grid.y = 100
+scene_ui.append(grid)
+
+retrieved_grid = scene_ui[-1]
+test(type(retrieved_grid) == MyGrid, "Grid maintains derived type")
+if hasattr(retrieved_grid, 'grid_name'):
+    test(retrieved_grid.grid_name == "custom_grid", "Grid custom data preserved")
+
+# Test 10: Test with nested collections (Frame with children)
+parent = MyFrame(400, 400)
+child = MyFrame(10, 10)
+child.custom_data = "I am a child"
+parent.children.append(child)
+scene_ui.append(parent)
+
+retrieved_parent = scene_ui[-1]
+test(type(retrieved_parent) == MyFrame, "Parent frame maintains type")
+if len(retrieved_parent.children) > 0:
+    retrieved_child = retrieved_parent.children[0]
+    test(type(retrieved_child) == MyFrame, "Child frame maintains type in nested collection")
+    if hasattr(retrieved_child, 'custom_data'):
+        test(retrieved_child.custom_data == "I am a child", "Child custom data preserved")
+
+# Print results
+print("\n=== Test Results ===")
+for result in test_results:
+    print(result)
+
+print(f"\n{'PASS' if test_passed else 'FAIL'}: {sum(1 for r in test_results if r.startswith('+'))}/{len(test_results)} tests passed")
+
+sys.exit(0 if test_passed else 1)

tests/unit/test_simple_callback.py

@@ -1,14 +1,32 @@
 #!/usr/bin/env python3
-"""Very simple callback test"""
+"""Very simple callback test - refactored to use mcrfpy.step()"""
 import mcrfpy
 import sys
 
+callback_fired = False
+
 def cb(a, t):
+    global callback_fired
+    callback_fired = True
     print("CB")
 
+# Setup scene
 test = mcrfpy.Scene("test")
 test.activate()
+mcrfpy.step(0.01)  # Initialize
+
+# Create entity and animation
 e = mcrfpy.Entity((0, 0), texture=None, sprite_index=0)
 a = mcrfpy.Animation("x", 1.0, 0.1, "linear", callback=cb)
 a.start(e)
-mcrfpy.Timer("exit", lambda t, r: sys.exit(0), 200, once=True)
+
+# Advance past animation duration (0.1s)
+mcrfpy.step(0.15)
+
+# Verify callback fired
+if callback_fired:
+    print("PASS: Callback fired")
+    sys.exit(0)
+else:
+    print("FAIL: Callback did not fire")
+    sys.exit(1)

tests/unit/test_simple_drawable.py

@@ -1,30 +1,32 @@
 #!/usr/bin/env python3
-"""Simple test to isolate drawable issue"""
+"""Simple test to isolate drawable issue
+Refactored to use mcrfpy.step() for synchronous execution.
+"""
 import mcrfpy
 import sys
 
-def simple_test(timer, runtime):
-    timer.stop()
-    
-    try:
-        # Test basic functionality
-        frame = mcrfpy.Frame(pos=(10, 10), size=(100, 100))
-        print(f"Frame created: visible={frame.visible}, opacity={frame.opacity}")
-        
-        bounds = frame.get_bounds()
-        print(f"Bounds: {bounds}")
-        
-        frame.move(5, 5)
-        print("Move completed")
-        
-        frame.resize(150, 150)
-        print("Resize completed")
-        
-        print("PASS - No crash!")
-    except Exception as e:
-        print(f"ERROR: {e}")
-    
-    sys.exit(0)
-
+# Initialize scene
 test = mcrfpy.Scene("test")
-simple_test_timer = mcrfpy.Timer("simple_test", simple_test, 100, once=True)
+test.activate()
+mcrfpy.step(0.01)
+
+try:
+    # Test basic functionality
+    frame = mcrfpy.Frame(pos=(10, 10), size=(100, 100))
+    print(f"Frame created: visible={frame.visible}, opacity={frame.opacity}")
+
+    bounds = frame.get_bounds()
+    print(f"Bounds: {bounds}")
+
+    frame.move(5, 5)
+    print("Move completed")
+
+    frame.resize(150, 150)
+    print("Resize completed")
+
+    print("PASS - No crash!")
+    sys.exit(0)
+except Exception as e:
+    print(f"ERROR: {e}")
+    print("FAIL")
+    sys.exit(1)

tests/unit/test_timer_callback.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 """
 Test timer callback arguments with new Timer API (#173)
+Uses mcrfpy.step() for synchronous test execution.
 """
 import mcrfpy
 import sys
@@ -14,9 +15,6 @@ def new_style_callback(timer, runtime):
     print(f"Callback called with: timer={timer} (type: {type(timer)}), runtime={runtime} (type: {type(runtime)})")
     if hasattr(timer, 'once'):
         print(f"Got Timer object! once={timer.once}")
-    if call_count >= 2:
-        print("PASS")
-        sys.exit(0)
 
 # Set up the scene
 test_scene = mcrfpy.Scene("test_scene")
@@ -25,3 +23,14 @@ test_scene.activate()
 print("Testing new Timer callback signature (timer, runtime)...")
 timer = mcrfpy.Timer("test_timer", new_style_callback, 100)
 print(f"Timer created: {timer}")
+
+# Advance time to let timer fire - each step() processes timers once
+mcrfpy.step(0.15)  # First fire
+mcrfpy.step(0.15)  # Second fire
+
+if call_count >= 2:
+    print("PASS: Timer callback received correct arguments")
+    sys.exit(0)
+else:
+    print(f"FAIL: Expected at least 2 callbacks, got {call_count}")
+    sys.exit(1)