Fix food spawn test and optimize test performance

pytest.ini

@@ -3,7 +3,7 @@ testpaths = tests
 python_files = test_*.py
 python_classes = Test*
 python_functions = test_*
-addopts = -v --tb=short -n auto
+addopts = -v --tb=short -n 4  # Limit to 4 parallel workers
 markers =
     slow: marks tests as slow (deselect with '-m "not slow"')
     integration: marks tests as integration tests

tests/conftest.py

@@ -8,6 +8,9 @@ sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')
 
 def pytest_configure(config):
     """Initialize pygame once before any tests run"""
+    # Set SDL to use software rendering and disable audio to reduce resource usage
+    os.environ['SDL_VIDEODRIVER'] = 'dummy'
+    os.environ['SDL_AUDIODRIVER'] = 'dummy'
     pygame.init()
 
 def pytest_unconfigure(config):
@@ -18,8 +21,8 @@ def pytest_unconfigure(config):
 def game_config():
     """Basic game configuration"""
     return {
-        'width': 800,
+        'width': 400,  # Smaller dimensions for testing
-        'height': 600,
+        'height': 300,
         'block_size': 20,
         'fps': 60
     }

tests/test_food.py

@@ -44,15 +44,17 @@ def test_food_spawn_full_grid():
     food = Food(20)
     width, height = 60, 60  # Small grid
     
-    # Create a snake that occupies most of the grid
+    # Create a snake that occupies all positions except (40, 40)
-    snake_body = [(x, y) for x in range(0, 60, 20) for y in range(0, 40, 20)]
+    all_positions = [(x, y) for x in range(0, 60, 20) for y in range(0, 60, 20)]
-    
-    # Leave one spot free at (40, 40)
     free_spot = (40, 40)
+    snake_body = [pos for pos in all_positions if pos != free_spot]
+    
+    # Verify our test setup is correct
+    assert len(snake_body) == len(all_positions) - 1
     assert free_spot not in snake_body
     
     # Spawn food
     food.spawn(width, height, snake_body)
     
-    # Food should spawn in the only free spot
+    # Food must spawn in the only free spot
     assert food.position == free_spot