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Component Tester Skill

component-tester

Run Vitest tests for a specific component with coverage. Use when making changes to React components to ensure tests pass and coverage is maintained.

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SKILL.md

Full skill instructions

Component Tester Skill

This Skill automatically runs Vitest tests when React components are modified to ensure code quality and test coverage.

When to Activate

  • After creating a new React component
  • When modifying existing component implementation
  • Before creating a pull request with component changes
  • When fixing bugs in components

Actions Performed

  1. Identify Component: Determine which component was created or modified
  2. Run Tests: Execute pnpm test -- <component-path> without watch mode
  3. Check Coverage: Verify test coverage meets project thresholds
  4. Report Results: Provide clear feedback on:
    • Test pass/​fail status
    • Coverage percentages (statements, branches, functions, lines)
    • Specific failing tests with error messages
    • Coverage gaps requiring additional tests

Example Usage

// User modifies: src/​app/​blog/​_components/​progress-bar.tsx
// Skill automatically runs:
// pnpm test -- src/​app/​blog/​_components/​progress-bar

// Output:
// ✓ should render progress bar with correct width
// ✓ should update progress on scroll
// ✓ should hide when not scrolled
// Coverage: 95% statements, 90% branches, 100% functions, 95% lines

Tools Used

  • Read: Examine component files and test files
  • Grep: Locate related test files
  • Bash: Execute pnpm test commands

Test Naming Convention

All tests should follow the "should" convention:

  • ✅ "should render title and children"
  • ✅ "should display empty state when data is empty"
  • ❌ "renders title and children"

Coverage Thresholds

Flag components with coverage below:

  • Statements: 80%
  • Branches: 75%
  • Functions: 80%
  • Lines: 80%

Related Files

  • Test location: __tests__/ directories next to components
  • Test suffix: .test.ts or .test.tsx
  • Configuration: vitest.config.ts in project root

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