A comprehensive guide and rule set for mastering Jest 29+ testing best practices in JavaScript and TypeScript projects.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install jest-skill
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install jest-skill using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is Jest Testing Specialist?
Jest is a powerhouse JavaScript and TypeScript testing framework that integrates a test runner, assertion library, and sophisticated mocking system. This Openclaw Skills entry provides developers with modern, high-performance patterns for unit and integration testing, ensuring your test suites are reliable, maintainable, and optimized for Jest 29 and 30 versions.
By moving beyond outdated training data, this skill focuses on critical modern features like async timer methods, ESM mocking through unstable_mockModule, and sophisticated property replacement. It acts as the foundational layer for high-quality software development, enabling precise verification of code behavior through its robust API surface within the Openclaw Skills ecosystem.
Jest Testing Specialist Use Cases
- Implementing unit and integration tests for JavaScript or TypeScript applications.
- Developing React component tests in conjunction with React Testing Library.
- Creating API contract tests using Jest and Supertest.
- Managing complex mock designs for module boundaries and third-party dependencies.
- Optimizing test execution in CI/CD pipelines using worker configuration.
How Jest Testing Specialist Works
- Initialize the testing environment by defining the appropriate Jest configuration for JavaScript or TypeScript.
- Structure tests using describe and test blocks to logically group assertions.
- Implement setup and teardown logic with beforeEach and afterEach to ensure test isolation.
- Define mocks and spies using jest.fn or jest.spyOn to isolate the code under test.
- Execute assertions using the expect API to verify expected outcomes and matchers.
- Clean up state using restoreAllMocks or resetModules to prevent side effects between tests.
Jest Testing Specialist Setup
Install the necessary dependencies to get started with this testing suite via Openclaw Skills:
npm install --save-dev jest @types/jest ts-jest
Initialize your configuration to define the environment:
npx jest --init
Ensure your project is compatible with Jest 29.0.0 or 30.0.0 to utilize the full range of advanced mocking and async features.
Jest Testing Specialist Data Schema & Taxonomy
| Component | Description |
|---|---|
| Test Files | Standard .test.js or .spec.ts files containing the test suites. |
| Mock Factories | Manual mocks located in mocks directories or inline jest.mock calls. |
| Snapshots | .snap files stored in snapshots folders for UI or data structure regression. |
| Coverage Reports | Generated HTML or JSON files detailing line, branch, and function coverage. |
| Configuration | jest.config.js or package.json keys for global settings and environment choice. |
Jest Testing Specialist Advanced Features
- ESM Support: Native ECMAScript Modules mocking via the jest.unstable_mockModule API.
- Timer Mocks: Advanced handling of recursive and async timers with runOnlyPendingTimers and selective faking.
- Dynamic Property Mocking: Safe and reversible replacement of object properties using jest.replaceProperty.
- CI Optimization: Performance tuning via --runInBand and maxWorkers for stable cloud execution.
- Multi-Skill Integration: Seamlessly works with other Openclaw Skills like msw for network mocking or zod-testing for schema validation.
SKILL.md
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