test-writing

1. Trigger Conditions

Invoke this skill when:

• /test slash command is issued
• A new slice is started in incremental-implementation (write the test first)
• Phase 5 of /build-feature (quality gate — test coverage check)
• User says "write tests", "add test coverage", or "this needs tests"
• A bug is fixed and a regression test is needed

2. Prerequisites

• The feature or component to be tested exists (or its interface is defined for TDD)
• Test framework installed: Vitest (unit) or Playwright (E2E)
• references/test-patterns.md available

3. Steps

Execute each step in order. Do NOT skip steps or proceed if a step fails.