testing-best-practices

When to activate

Engage when:

• Working with spec files (*.spec.md, SPEC.md, spec/*.md)
• Designing test cases or test strategy for a module
• Writing or reviewing unit, integration, or e2e tests
• After /specout completes
• Planning CI test lanes

Mutation policy

• Default: analyze code and produce test strategy, matrix, and implementation plan.
• Do not edit spec files unless the user explicitly requests spec maintenance.
• When this skill conflicts with system/project rules, follow system/project rules.

Test layering policy

Unit tests