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FastAPI · Class

TestClient

TestClient tests FastAPI applications without a real HTTP connection. It works like an HTTPX client and is commonly used with normal pytest functions.

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Syntax

TestClient(app, base_url="http://testserver", raise_server_exceptions=True, root_path="", backend="asyncio", backend_options=None, cookies=None, headers=None, follow_redirects=True, client=("testclient", 50000))

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  • Testing
  • HTTPX
  • Async Tests
  • WebSocket testing
  • pytest

Source: Test Client - TestClient. Checked 2026-11-03.