Fix test_server.py to use sample_spec_path fixture

tests/integration/test_server.py

@@ -8,16 +8,13 @@ from mockapi.core.server_generator import MockServerGenerator
 from mockapi.core.config import Config
 
 
-SAMPLE_SPEC_PATH = "examples/petstore.yaml"
-
-
 class TestMockServerIntegration:
     """Integration tests for mock server."""
 
     @pytest.fixture
-    def sample_spec(self):
+    def sample_spec(self, sample_spec_path):
         """Load sample OpenAPI spec."""
-        loader = SpecLoader(SAMPLE_SPEC_PATH)
+        loader = SpecLoader(sample_spec_path)
         return loader.load()
 
     @pytest.fixture