본문으로 건너뛰기
cccskills
무료GitHub에 공개

javascript-typescript-jest

Write JavaScript and TypeScript tests with Jest using consistent structure, dependency mocking, and checks for asynchronous code. Includes guidance for snapshots and React components, focusing on user interactions, accessibility, and choosing appropriate assertions for expected results.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

원문원문 설명 보기

Best practices for writing JavaScript/TypeScript tests using Jest, including mocking strategies, test structure, and common patterns.

github/awesome-copilot
설치 방법 보기

이럴 때 유용합니다

  • Organize Jest test files and test names
  • Replace API or database dependencies with mocks
  • Test asynchronous results and errors
  • Test React interactions and accessibility

포함된 파일(1)

  • SKILL.md2.2 KB

SKILL.md(원문)

설치하기 전에 에이전트에게 전달되는 지시 내용을 확인할 수 있습니다.

Test Structure

  • Name test files with .test.ts or .test.js suffix
  • 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() or mockReturnValue() to define mock behavior
  • Reset mocks between tests with jest.resetAllMocks() in afterEach

Testing Async Code

  • Always return promises or use async/await syntax in tests
  • Use resolves/rejects matchers 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 userEvent over fireEvent for 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)

리뷰

아직 리뷰가 없습니다. 사용해 본 소감을 남겨 주세요.

댓글

로그인 없이 쓸 수 있습니다. 사용 후기, 질문, 작동하지 않은 환경 등을 편하게 남겨 주세요.

아직 댓글이 없습니다. 첫 댓글을 남겨 보세요.

보내면 바로 공개됩니다. 이메일 주소나 전화번호 같은 개인 정보는 쓰지 마세요. URL은 2개까지입니다.

0 / 1,000자

이 양식은 reCAPTCHA로 보호되며 Google 개인정보처리방침 및 서비스 약관이 적용됩니다.

같은 저장소의 스킬

acquire-codebase-knowledge

무료

Map an existing codebase into seven documents covering its technology, structure, architecture, conventions, integrations, tests, and concerns. Link findings to file evidence, mark unknowns, and highlight differences between stated plans and the actual implementation.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

  • Get oriented in an unfamiliar codebase
  • Prepare documentation for a project handover
  • Compare documented architecture with implementation
github/awesome-copilot4만2026년 10월 17일 업데이트

acreadiness-assess

무료

Assess a repository’s readiness for AI agents with AgentRC and generate a standalone HTML dashboard. Review scores across nine areas, see prioritized improvements, and optionally apply scoring policies tailored to an organization.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

  • Assessing a repository’s readiness for AI agents
  • Prioritizing improvements from assessment results
  • Reviewing scores under an organization’s own policy
github/awesome-copilot4만2026년 10월 17일 업데이트

acreadiness-generate-instructions

무료

Generate coding agent instruction files from a project's actual code using AgentRC. Capture detected languages, frameworks, and conventions in one shared file or split rules by topic and project area, with a preview before writing.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

  • Create project instructions for VS Code Copilot
  • Refresh agent rules after project changes
  • Split monorepo instructions by project area
github/awesome-copilot4만2026년 10월 17일 업데이트

acreadiness-policy

무료

Customize AgentRC readiness assessments to match team or organization standards. Choose or create policies that adjust check importance, disable irrelevant checks, set pass thresholds, and define requirements for automated checks in CI workflows.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

  • Set shared readiness standards across an organization
  • Focus assessments on AI tooling
  • Adjust the importance of individual checks
github/awesome-copilot4만2026년 10월 17일 업데이트

ad-campaign-analyzer

무료

Analyze supplied ad performance data to identify wasted spend, strong campaigns, and next tests. Compare channels, assess whether test differences are meaningful, and produce budget reallocation recommendations with a prioritized action plan.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

  • Identify ads and keywords to pause
  • Find campaigns and audiences worth scaling
  • Assess whether A/B test results are meaningful
github/awesome-copilot4만2026년 10월 17일 업데이트

add-educational-comments

무료

Turn code files into learning resources by adding comments that explain syntax, programming concepts, and design choices. Adjust explanation depth and repetition to the reader’s knowledge while preserving file structure, encoding, and syntax.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

  • Add beginner-friendly explanations to existing code
  • Document the reasoning behind syntax and design choices
  • Adjust comment depth for readers with different experience
github/awesome-copilot4만2026년 10월 17일 업데이트

github의 스킬 모두 보기

이 스킬의 문제 신고