사용 방법
- 설치 명령을 복사하고 자신의 에이전트 환경에 설치하기 전에 소스 패키지를 확인하세요.
- 필요한 도구, 인증 정보, 지원 환경은 원본 문서에서 확인하세요.
- 입력과 원하는 산출물을 설명하고 출처와 결과를 대조하세요.
npx skills add https://github.com/github/awesome-copilot --skill javascript-typescript-jest시작 전 확인
- 설치에는 모델 구독, API 한도, 파일 접근 권한이 포함되지 않습니다.
- 별점 수와 설치 수는 활동 지표이며 독립적인 품질·보안 검증이 아닙니다.
원본 Skill 문서
원본 저장소의 제목, 예시, 코드, 표, 링크, 이미지를 유지해 표시합니다.
Test Structure
- Name test files with
.test.tsor.test.jssuffix - Place test files next to the code they test or in a dedicated
__tests__directory - Use descriptive test names that explain the expected behavior
- Use nested describe blocks to organize related tests
- Follow the pattern:
describe('Component/Function/Class', () => { it('should do something', () => {}) })
Effective Mocking
- Mock external dependencies (APIs, databases, etc.) to isolate your tests
- Use
jest.mock()for module-level mocks - Use
jest.spyOn()for specific function mocks - Use
mockImplementation()ormockReturnValue()to define mock behavior - Reset mocks between tests with
jest.resetAllMocks()inafterEach
Testing Async Code
- Always return promises or use async/await syntax in tests
- Use
resolves/rejectsmatchers for promises - Set appropriate timeouts for slow tests with
jest.setTimeout()
Snapshot Testing
- Use snapshot tests for UI components or complex objects that change infrequently
- Keep snapshots small and focused
- Review snapshot changes carefully before committing
Testing React Components
- Use React Testing Library over Enzyme for testing components
- Test user behavior and component accessibility
- Query elements by accessibility roles, labels, or text content
- Use
userEventoverfireEventfor more realistic user interactions
Common Jest Matchers
- Basic:
expect(value).toBe(expected),expect(value).toEqual(expected) - Truthiness:
expect(value).toBeTruthy(),expect(value).toBeFalsy() - Numbers:
expect(value).toBeGreaterThan(3),expect(value).toBeLessThanOrEqual(3) - Strings:
expect(value).toMatch(/pattern/),expect(value).toContain('substring') - Arrays:
expect(array).toContain(item),expect(array).toHaveLength(3) - Objects:
expect(object).toHaveProperty('key', value) - Exceptions:
expect(fn).toThrow(),expect(fn).toThrow(Error) - Mock functions:
expect(mockFn).toHaveBeenCalled(),expect(mockFn).toHaveBeenCalledWith(arg1, arg2)
