---

name: testing-standards description: Write comprehensive tests following TDD and best practices. Use when generating unit tests, integration tests, or end-to-end tests for any code dependencies:

• jest
• @testing-library/react

---

Testing Standards Skill

Test Structure (AAA Pattern)

Copydescribe('Component/Function Name', () => {
  it('should do something specific', () => {
    // Arrange - Set up test data
    const input = { foo: 'bar' }
    
    // Act - Execute the code
    const result = functionUnderTest(input)
    
    // Assert - Verify results
    expect(result).toEqual(expectedOutput)
  })
})

Test Categories

Unit Tests

• Test single functions/methods
• Mock all dependencies
• Fast (<100ms per test)
• High coverage (80%+)

Integration Tests

• Test component interactions
• Use test database
• Moderate speed
• Focus on critical paths

E2E Tests

• Test complete user flows
• Use real browser
• Slower execution
• Test happy paths only

Best Practices

1. Descriptive Names: it('should return 401 when token is expired')
2. One Assert Per Concept: Test one thing at a time
3. Independent Tests: No shared state between tests
4. Use Factories: Create test data with factories
5. Mock External Services: APIs, databases, file system