feat: new tests for endpoints

tests/conftest.py

@@ -1,5 +1,6 @@
 from pathlib import Path
 import pytest
+from fastapi.testclient import TestClient
 
 
 def pytest_configure():
@@ -9,3 +10,14 @@ def pytest_configure():
     pytest.COMPLEX_EXAMPLE_PATH = (
         Path(__file__).parent.absolute() / "data" / "complex_example.json"
     )
+
+
+# Create client fixture for FastAPI
+@pytest.fixture(scope="module")
+def client():
+    from langflow.main import create_app
+
+    app = create_app()
+
+    with TestClient(app) as client:
+        yield client