Add test script for app.py

Tests without launching server:
- Import validation
- Syntax checking
- Function existence
- Interface creation

All 4 tests passing ✅

test_app.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+"""
+Test script for app.py - validates without launching server
+"""
+import sys
+
+def test_imports():
+    """Test that all imports work"""
+    try:
+        import gradio as gr
+        print("✓ gradio imported")
+        return True
+    except ImportError as e:
+        print(f"✗ Import failed: {e}")
+        return False
+
+def test_syntax():
+    """Test Python syntax"""
+    try:
+        with open('app.py', 'r') as f:
+            compile(f.read(), 'app.py', 'exec')
+        print("✓ Syntax valid")
+        return True
+    except SyntaxError as e:
+        print(f"✗ Syntax error: {e}")
+        return False
+
+def test_function_exists():
+    """Test that main function exists"""
+    try:
+        import app
+        assert hasattr(app, 'create_game_interface')
+        print("✓ create_game_interface() exists")
+        return True
+    except Exception as e:
+        print(f"✗ Function test failed: {e}")
+        return False
+
+def test_interface_creation():
+    """Test interface can be created without launching"""
+    try:
+        import app
+        demo = app.create_game_interface()
+        print("✓ Interface created successfully")
+        print(f"  Components: {len(demo.blocks)}")
+        return True
+    except Exception as e:
+        print(f"✗ Interface creation failed: {e}")
+        return False
+
+if __name__ == "__main__":
+    print("🧪 Testing app.py\n")
+    
+    tests = [
+        test_imports,
+        test_syntax,
+        test_function_exists,
+        test_interface_creation,
+    ]
+    
+    results = [test() for test in tests]
+    
+    print(f"\n{'='*50}")
+    print(f"Results: {sum(results)}/{len(results)} tests passed")
+    
+    if all(results):
+        print("✅ All tests passed!")
+        sys.exit(0)
+    else:
+        print("❌ Some tests failed")
+        sys.exit(1)