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write-tests

separate

Write tests that pin real behavior instead of implementation details, config values, or lucky samples. Use when adding tests for new behavior, writing a regression test, fixing a brittle or flaky test, reviewing a test diff, or when a test breaks after a refactor or config change that didn't change behavior.

When to use

• adding tests for new behavior
• writing a regression test
• fixing a brittle or flaky test
• reviewing a test diff
• test breaks after a refactor or config change that didn't change behavior

When not to use

• deciding whether coverage adds independent proof
• deciding where coverage belongs
• deciding which existing tests can go

Skill page

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