使用方法
- 复制安装命令，在自己的智能体环境安装前先检查源码包。
- 从原始文档核对所需工具、凭据和支持的宿主。
- 说明输入材料与期望交付物，并对照来源检查输出。
npx skills add https://github.com/github/awesome-copilot --skill javascript-typescript-jest开始前需了解
- 安装不包含模型订阅、API 额度或访问文件的权限。
- 仓库星数和安装量反映活跃情况，不等于独立质量或安全测试。
仓库原始内容
按源仓库内容呈现，保留标题、案例、代码、表格、链接以及原文引用的演示图片。
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)
