// Hacker Noon · 29 May 2026

How to Test External API Calls in FastAPI Applications Using Requests-mock and Pytest-httpx

External HTTP calls are often tested by patching client methods directly, but this can hide problems in URL building, request bodies, status handling, and response parsing. A better approach is to mock the external HTTP service with requests-mock or pytest-httpx, while keeping the real application c...

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