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Testing Code That Calls an LLM: How I Mock the OpenAI Client in pytest (Without Burning Requests)

Community description: I'm Aman Kumar. I build an OpenAI-compatible gateway, so I spend a lot of time reading other people's...

Dev.to | Oct 11, 2026 | Aman Kumar

Automated excerpt

One pattern shows up constantly: a test suite that calls the real model on every run. Model ID and base URL come from config, which also means switching providers never touches the function. LLM_MODEL=deepseek-v4-flash pytest tests/test_live. py Snapshot-testing model output.

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