vitest-unit-component-engineer

What problem does it solve?

This Skill removes guesswork from Vitest testing by helping you write fast, deterministic unit and component tests that match the actual behavior of your code.

Core Features & Use Cases

• Environment Selection: Chooses node for pure logic and jsdom or happy-dom only when DOM behavior is real and needed.
• Behavior-Focused Testing: Uses observable outcomes, Testing Library queries, and userEvent instead of implementation-coupled assertions.
• Deterministic Test Design: Handles fake timers, owned-boundary mocks, and setup changes while avoiding flaky network, time, and randomness dependence.
• Real Execution Reporting: Runs the suite manually and reports the exact command plus genuine pass/fail output.
• Use Case: A developer needs tests for a currency formatter, a reducer, and a React invoice row component, with clear environment choices and honest results.

Quick Start

Ask the skill to write or fix Vitest tests for a utility or component suite, and include the files, behavior to cover, and any environment or setup constraints.