Unit Test Writer

What this skill does

This skill directs the agent to write a thorough unit test suite for a given function, class, or module. It systematically identifies happy paths, edge cases, error paths, and boundary conditions — then writes tests in your chosen framework (Jest, Vitest, Mocha, etc.) with proper mocking where needed.

Use this when you have a function that needs test coverage or when you want to verify your implementation handles edge cases you might not have thought of.

How to use

Claude Code / Cline

Copy this file to .agents/skills/unit-test-writer/SKILL.md in your project root.

Then ask the agent:

• "Write unit tests for src/utils/formatCurrency.ts using the Unit Test Writer skill."
• "Use the Unit Test Writer skill to generate Vitest tests for this function."

Paste the function code into the chat, or reference the file path.