🚧 chore(conftest.py): add fixtures for database testing

✅ test(database.py): add tests for CRUD operations on Flow model
The new fixtures added to conftest.py are session and client fixtures. These fixtures are used to create a test database and a test client for testing the database. The tests added to test_database.py test the CRUD operations on the Flow model. The tests include creating a flow, reading all flows, reading a single flow, updating a flow, and deleting a flow. These tests ensure that the database is working as expected and that the API endpoints for the Flow model are functioning correctly.

tests/conftest.py

@@ -1,10 +1,13 @@
 import json
 from pathlib import Path
 from typing import AsyncGenerator
+from langflow.api.database import get_session
 
 import pytest
 from fastapi.testclient import TestClient
 from httpx import AsyncClient
+from sqlmodel import SQLModel, Session, create_engine
+from sqlmodel.pool import StaticPool
 
 
 def pytest_configure():
@@ -76,3 +79,35 @@ def complex_graph():
 @pytest.fixture
 def openapi_graph():
     return get_graph("openapi")
+
+
+@pytest.fixture
+def json_flow():
+    with open(pytest.BASIC_EXAMPLE_PATH, "r") as f:
+        return f.read()
+
+
+@pytest.fixture(name="session")  #
+def session_fixture():  #
+    engine = create_engine(
+        "sqlite://", connect_args={"check_same_thread": False}, poolclass=StaticPool
+    )
+    SQLModel.metadata.create_all(engine)
+    with Session(engine) as session:
+        yield session
+
+
+@pytest.fixture(name="client")  #
+def client_fixture(session: Session):  #
+    def get_session_override():  #
+        return session
+
+    from langflow.main import create_app
+
+    app = create_app()
+
+    app.dependency_overrides[get_session] = get_session_override  #
+
+    client = TestClient(app)  #
+    yield client  #
+    app.dependency_overrides.clear()  #