FastAPI testing critical
FastAPI Testing with Pytest
Comprehensive FastAPI testing patterns using pytest and httpx. Covers async testing, fixtures, database testing, dependency overrides, and mocking.
- Difficulty
- intermediate
- Read time
- 1 min read
- Version
- v1.0.0
- Confidence
- established
- Last updated
Quick Reference
FastAPI Testing: Use pytest-asyncio + httpx AsyncClient. Override dependencies with app.dependency_overrides. Use fixtures for DB sessions. Test with ASGITransport(app=app). Clean up with yield fixtures. Mark async tests with @pytest.mark.asyncio.
Use When
- Testing FastAPI endpoints
- Testing async services
- Testing database operations
- Integration testing
Skip When
- E2E browser testing (use Playwright)
- Load testing (use Locust)
- Frontend testing
FastAPI Testing with Pytest
Comprehensive FastAPI testing patterns using pytest and httpx. Covers async testing, fixtures, database testing, dependency overrides, and mocking.