Create conftest.py

conftest.py

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+import asyncio
+from typing import AsyncGenerator
+import pytest
+import pytest_asyncio
+from httpx import ASGITransport, AsyncClient
+from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker
+from sqlmodel import SQLModel
+from sqlmodel.ext.asyncio.session import AsyncSession
+
+from app.main import app
+from app.core.database import get_db_session
+
+# SQLite in-memory engine for fast local testing (or test PostgreSQL instance)
+TEST_DATABASE_URL = "sqlite+aiosqlite:///:memory:"
+
+test_engine = create_async_engine(TEST_DATABASE_URL, echo=False)
+TestingSessionLocal = async_sessionmaker(
+    test_engine, class_=AsyncSession, expire_on_commit=False
+)
+
+@pytest.fixture(scope="session")
+def event_loop():
+    """Create an instance of the default event loop for the test session."""
+    loop = asyncio.get_event_loop_policy().new_event_loop()
+    yield loop
+    loop.close()
+
+@pytest_asyncio.fixture(scope="function")
+async def db_session() -> AsyncGenerator[AsyncSession, None]:
+    """Provides a clean database session per test function."""
+    async with test_engine.begin() as conn:
+        await conn.run_sync(SQLModel.metadata.create_all)
+
+    async with TestingSessionLocal() as session:
+        yield session
+
+    async with test_engine.begin() as conn:
+        await conn.run_sync(SQLModel.metadata.drop_all)
+
+@pytest_asyncio.fixture(scope="function")
+async def client(db_session: AsyncSession) -> AsyncGenerator[AsyncClient, None]:
+    """Provides an AsyncClient bound to the FastAPI app with DB dependency override."""
+    async def _get_test_db():
+        yield db_session
+
+    app.dependency_overrides[get_db_session] = _get_test_db
+
+    async with AsyncClient(
+        transport=ASGITransport(app=app), base_url="http://testserver"
+    ) as ac:
+        yield ac
+
+    app.dependency_overrides.clear()