test-gen

What This Skill Does

The test-gen skill acts as an intelligent assistant designed to bolster your software's reliability by automatically generating unit tests for your existing codebase. Recognizing that writing boilerplate tests is often a chore, this tool parses your source files, identifies exported functions, classes, and methods, and crafts meaningful test suites. It doesn't just generate empty shells; it intelligently builds test cases that encompass happy paths, critical edge cases, and error conditions for popular frameworks like Jest, Vitest, and Mocha. By automating dependency mocking and generating realistic assertions, it helps developers quickly reach coverage targets without the manual grind of initial setup.

Installation

Installation is streamlined through the OpenClaw ecosystem. You can add this capability directly to your agent environment by running the following command in your terminal:

clawhub install openclaw/skills/skills/lxgicstudios/test-gen

Since this tool leverages npx, it requires no global installation or complex dependency management, making it an ideal 'zero-config' utility for Node.js 18+ environments.

Use Cases

This skill is perfect for scenarios where you need to improve code health without spending hours on repetitive tasks. It is exceptionally useful when inheriting legacy projects that lack test coverage, as it provides an immediate baseline for refactoring. It is also a powerful productivity booster for new features, ensuring that as you build, you have a solid suite of tests guarding against regressions. Whether you are aiming to meet a specific CI coverage threshold or simply want to enforce better architectural habits, test-gen accelerates the feedback loop between code authoring and verification.

Example Prompts

1. "Generate a full suite of unit tests for the functions defined in ./src/database/queries.ts using Vitest."
2. "Review my ./src/auth/session.ts file and create tests that specifically cover the token expiration and invalid payload error paths."
3. "Create a test file for the calculator service in ./src/services/math.ts and output the result directly into the ./tests/math.test.ts directory."

Tips & Limitations

While test-gen is highly effective, treat it as a force multiplier rather than a human replacement. Always review the output before committing to your repository. Because AI can make assumptions about external dependencies, you should verify that generated mocks align with your current integration logic. Finally, augment these tests with your domain-specific knowledge; you know the business logic's nuances better than any model. Use this tool as a launchpad to reach 80%+ coverage, then finalize the suite with targeted human-written tests to ensure mission-critical behaviors are fully validated.