test-writer

What This Skill Does

The test-writer skill is an automated unit test generation engine designed to eliminate the tedious boilerplate associated with test-driven development. Instead of spending hours manually crafting test suites, this tool analyzes your TypeScript or JavaScript source files to understand function signatures, logic flows, and data structures. It then leverages AI to produce high-quality, executable unit tests complete with meaningful assertions. Whether you are working with Jest, Vitest, or Mocha, the tool ensures that your codebase gains immediate test coverage. It is designed for developers who need to jump-start their testing workflow without navigating complex configuration files or lengthy setup processes.

Installation

You can install this skill directly into your OpenClaw environment using the following command:

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

Once installed, ensure you are running a Node.js 18+ environment. The tool is executed via npx, meaning it does not require a permanent global installation on your machine.

Use Cases

• Legacy Code Rescue: Quickly add test coverage to undocumented legacy utility files.
• Rapid Prototyping: Generate tests as you write new code to ensure functionality before moving to the next feature.
• CI/CD Readiness: Prepare your project for automated build pipelines by generating foundational test suites instantly.
• Technical Debt Reduction: Address the common "zero-test" project state by bulk-generating tests for core business logic.

Example Prompts

1. "Use test-writer to generate Jest tests for src/auth-utils.ts and save them to the tests folder."
2. "Run the test-writer on all files in the src/helpers/ directory using the Vitest framework."
3. "Generate unit tests for my utility file, but make sure to include extra assertions for boundary conditions like empty arrays and null inputs."

Tips & Limitations

• Start Small: The tool performs best on pure functions with clear input/output mappings. Start by applying it to your utils directory.
• Review Required: While the tool generates excellent assertions, it cannot know your business intent perfectly. Always review generated files to ensure they handle domain-specific edge cases correctly.
• Framework Consistency: Stick to one framework per project. Mixing Mocha and Jest in a single repository often leads to configuration nightmares.
• Manual Refinement: Use the generated output as a base. You should treat the output as a high-quality boilerplate that you can then manually extend for complex integration testing scenarios.