Refactor 11 more tests to mcrfpy.step() pattern

Converted from Timer-based async to step()-based sync:
- 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

Only 4 tests remain with Timer-based patterns (2 are headless detection
tests that may require special handling).

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

Co-Authored-By: Frack <frack@goblincorps.dev>
Co-Authored-By: Claude <noreply@anthropic.com>

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)