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document test review guidance

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Sayan Sisodiya
2026-05-04 10:59:23 -07:00
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AGENTS.md
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@@ -108,6 +108,15 @@ See `codex-rs/tui/styles.md`.
## Tests
When reviewing or adding tests:
- Ask whether the test makes sense.
- Ask whether it actually asserts something valuable that you care about.
- Ask how much the test would need to change if the surrounding system were refactored.
- Ask whether you or someone else would notice the regression if Codex auto-updated the test.
If a unit test mostly covers deep implementation details, static data, removed behavior, or requires heavy monkeypatching, prefer deleting it and writing an integration test that protects meaningful end-to-end behavior instead.
### Snapshot tests
This repo uses snapshot tests (via `insta`), especially in `codex-rs/tui`, to validate rendered output.