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vitest

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Vitest testing framework patterns for test setup, async testing, mocking with vi.*, snapshots, and test performance (formerly test-vitest). This skill should be used when writing or debugging Vitest tests. This skill does NOT cover TDD methodology (use test-tdd skill), API mocking with MSW (use test-msw skill), or Jest-specific APIs.

skills/.curated/vitest/SKILL.md

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# Vitest Best Practices

Comprehensive performance optimization and best practices guide for Vitest testing framework. Contains 44 rules across 8 categories, prioritized by impact to guide test writing, refactoring, and code review.

## When to Apply

Reference these guidelines when:
- Writing new Vitest tests
- Debugging flaky or slow tests
- Setting up test configuration
- Reviewing test code in PRs
- Migrating from Jest to Vitest
- Optimizing CI/CD test performance
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