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
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