Directory structure cleanup and organization overhaul

tests/integration/simple_visibility_test.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+"""Simple visibility test without entity append"""
+
+import mcrfpy
+import sys
+
+print("Simple visibility test...")
+
+# Create scene and grid
+mcrfpy.createScene("simple")
+print("Scene created")
+
+grid = mcrfpy.Grid(grid_x=5, grid_y=5)
+print("Grid created")
+
+# Create entity without appending
+entity = mcrfpy.Entity(2, 2, grid=grid)
+print(f"Entity created at ({entity.x}, {entity.y})")
+
+# Check if gridstate is initialized
+print(f"Gridstate length: {len(entity.gridstate)}")
+
+# Try to access at method
+try:
+    state = entity.at(0, 0)
+    print(f"at(0,0) returned: {state}")
+    print(f"visible: {state.visible}, discovered: {state.discovered}")
+except Exception as e:
+    print(f"Error in at(): {e}")
+
+# Try update_visibility
+try:
+    entity.update_visibility()
+    print("update_visibility() succeeded")
+except Exception as e:
+    print(f"Error in update_visibility(): {e}")
+
+print("Test complete")
+sys.exit(0)