FastAPI Testing
FastAPI Testing
Patterns for testing FastAPI applications.
Core Concepts
Test Clients
| Client | Use Case | Async Support |
|---|---|---|
| TestClient | Sync tests (most cases) | No |
| AsyncClient (httpx) | Async endpoints, lifespan events | Yes |
Key concept: TestClient wraps the ASGI app - no server needed.
Dependency Override Pattern
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