When to use this skill

Use this skill when you need to:

• Write new tests (Unit, Integration/Feature, or E2E) for any feature or bug fix
• Review existing tests for quality, placement, or value
• Decide whether a test belongs at Unit, Integration, or E2E level
• Refactor tests that are fragile, duplicated, or misplaced
• Design a testing strategy for a new project or module

When NOT to use this skill

• For non-test code changes that don't need test coverage decisions

The Testing Pyramid (Martin Fowler)