jest

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

509 stars

bya5c-ai

View on GitHub Installation ↓

Best use case

jest is best used when you need a repeatable AI agent workflow instead of a one-off prompt.

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

Teams using jest should expect a more consistent output, faster repeated execution, less prompt rewriting.

When to use this skill

You want a reusable workflow that can be run more than once with consistent structure.

When not to use this skill

You only need a quick one-off answer and do not need a reusable workflow.
You cannot install or maintain the underlying files, dependencies, or repository context.

Installation

Claude Code / Cursor / Codex

$curl -o ~/.claude/skills/jest/SKILL.md --create-dirs "https://raw.githubusercontent.com/a5c-ai/babysitter/main/library/specializations/web-development/skills/jest/SKILL.md"

Manual Installation

Download SKILL.md from GitHub
Place it in .claude/skills/jest/SKILL.md inside your project
Restart your AI agent — it will auto-discover the skill

How jest Compares

Feature / Agent	jest	Standard Approach
Platform Support	Not specified	Limited / Varies
Context Awareness	High	Baseline
Installation Complexity	Unknown	N/A

Frequently Asked Questions

What does this skill do?

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

Where can I find the source code?

You can find the source code on GitHub using the link provided at the top of the page.

SKILL.md Source

# 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

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