Jest Skill

SkillDev tools

Jest configuration, mocking strategies, snapshot testing, and coverage.

Instructions available. Your AI can read the instructions. Execution depends on the setup they require.

Account requirements not reviewed. Check the skill instructions before use; ahel provides instructions and does not run this skill.

Add ahel to your AI once: Claude, ChatGPT, Cursor, Claude Code or Codex. Then ask it to use this.

Then ask your AI: use the Jest Skill skill

What this skill tells your AI

The instructions your AI receives, as published by a5c-ai/babysitter in library/specializations/web-development/skills/jest/SKILL.md and read by ahel’s review.

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

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

Signals

GitHub stars: 2k
Forks: 112
Last commit: Sep 2026

Advanced

Item type: skill
Key: jest
Source: github.com/a5c-ai/babysitter

github.com/a5c-ai/babysitter