Simon Willison 1/27/2026

Tips for getting coding agents to write good Python tests

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The article shares practical advice for prompting AI coding agents to write effective Python tests. It emphasizes the importance of a project's existing test suite, using specific libraries like pytest-httpx, and refactoring common anti-patterns like duplicated setup code. The author recommends directing agents to study well-structured example projects to adopt good testing patterns automatically.

Tips for getting coding agents to write good Python tests

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