What problem does it solve? Writing tests that actually catch bugs is hard: teams often chase coverage numbers with shallow assertions, flaky mocks, and inconsistent patterns. This Skill guides the implementation of deterministic, result-validating tests for any codebase, from unit tests to Storybook interaction tests. ## Core Features & Use Cases - Multi-source context intake: Accepts testing plans, GitHub issues (via gh issue view), source files, or conversational requirements as input. - Package-aware patterns: Applies the right testing approach per package type — Vitest unit tests for core token scripts, Storybook play functions for React components, and integration tests for pipelines. - Structured four-phase workflow: Understand the target, design the strategy (fixtures, mocks, test types), implement systematically, then verify determinism and error coverage. - Use Case: Given a GitHub issue requesting coverage for a new React component, the Skill fetches the issue, detects the packages/react/ context, and implements story-first tests with play functions plus error and edge cases. ## Quick Start Ask the agent to implement tests for a specific source file or GitHub issue, for example by saying: implement tests for the Button component following the testing guide.
