# Test Enforcement

- Add or update tests for behavior and logic changes when a test provides meaningful regression coverage.
- Pure copy, styling, and layout-only changes do not require new or updated tests.
- When test coverage applies, run the affected tests and ensure they pass.
- Test the changed behavior and its important failure modes, but do not add tests beyond them.
- Read the ___SINGLE_BACKTICK___testing-best-practices___SINGLE_BACKTICK___ skill before writing tests.