jest
Jest configuration, mocking strategies, snapshot testing, and coverage.
npx skills add a5c-ai/babysitter --skill jest --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Jest Skill Expert assistance for testing with Jest. ## Capabilities - Configure Jest for various frameworks - Implement mocking strategies - Write snapshot tests - Configure coverage - Handle async testing ## Test Patterns ```typescript describe('UserService', () => { let service: UserService; let mockRepository: jest.Mocked<UserRepository>; beforeEach(() => { mockRepository = { findAll: jest.fn(), findById: jest.fn(), create: jest.fn(), }; service = new UserService(mockRepository); }); it('should return all users', async () => { mockRepository.findAll.mockResolvedValue([{ id: '1', name: 'John' }]); const result = await service.findAll(); expect(result).toHaveLength(1); expect(mockRepository.findAll).toHaveBeenCalled(); }); }); ``` ## Target Processes - unit-testing - integration-testing - tdd-development
- Capabilities
- Test Patterns
- Target Processes
What does the jest skill do?
Jest configuration, mocking strategies, snapshot testing, and coverage.
How do I install it?
Run `npx skills add a5c-ai/babysitter --skill jest --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From a5c-ai/babysitter, a repository with 1,642 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.