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vitest
Vitest 5 unit tests and mocking.
skills/vitest/SKILL.md
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SKILL.mdcore · 4,938 bytesSKILL.mdcore · 4,938 bytesSKILL.mdcore · 4,938 bytesreferences/assert-edge-cases.mddoc · 2,307 bytesreferences/assert-expect-assertions.mddoc · 2,345 bytesreferences/assert-one-assertion-concept.mddoc · 2,622 bytesreferences/assert-specific-matchers.mddoc · 2,616 bytesreferences/assert-toequal-vs-tobe.mddoc · 2,186 bytesreferences/async-act-wrapper.mddoc · 2,453 bytesreferences/async-await-assertions.mddoc · 1,466 bytesreferences/async-concurrent-expect.mddoc · 1,916 bytesreferences/async-error-handling.mddoc · 2,107 bytesreferences/async-fake-timers.mddoc · 2,013 bytesreferences/async-return-promises.mddoc · 1,540 bytesreferences/async-waitfor-polling.mddoc · 2,445 bytesreferences/env-browser-api-mocking.mddoc · 2,273 bytesreferences/env-globals-config.mddoc · 2,056 bytesreferences/env-per-file-override.mddoc · 3,251 bytesreferences/env-setup-files.mddoc · 2,349 bytesreferences/mock-avoid-overmocking.mddoc · 2,908 bytesreferences/mock-clear-between-tests.mddoc · 2,411 bytesreferences/mock-implementation-not-value.mddoc · 2,361 bytesreferences/mock-msw-network.mddoc · 2,682 bytesreferences/mock-spyon-vs-mock.mddoc · 2,478 bytesreferences/mock-type-safety.mddoc · 2,498 bytesreferences/mock-vi-mock-hoisting.mddoc · 3,003 bytesreferences/org-describe-nesting.mddoc · 2,490 bytesreferences/org-file-colocation.mddoc · 1,746 bytesreferences/org-test-naming.mddoc · 2,072 bytesreferences/org-test-skip-only.mddoc · 1,821 bytesreferences/perf-bail-fast-fail.mddoc · 1,778 bytesreferences/perf-bench-test-context.mddoc · 2,347 bytesreferences/perf-disable-isolation.mddoc · 2,151 bytesreferences/perf-happy-dom.mddoc · 2,306 bytesreferences/perf-pool-selection.mddoc · 2,023 bytesreferences/perf-run-mode-ci.mddoc · 2,272 bytesreferences/perf-sharding.mddoc · 3,035 bytesreferences/setup-avoid-shared-state.mddoc · 2,547 bytesreferences/setup-beforeall-expensive.mddoc · 2,336 bytesreferences/setup-beforeeach-cleanup.mddoc · 1,980 bytesreferences/setup-reset-modules.mddoc · 2,601 bytesreferences/setup-restore-mocks.mddoc · 2,755 bytesreferences/setup-test-factories.mddoc · 2,913 bytesreferences/setup-vitest5-migration.mddoc · 4,622 bytesreferences/snap-avoid-large.mddoc · 2,333 bytesreferences/snap-describe-intent.mddoc · 2,129 bytesreferences/snap-inline-over-file.mddoc · 1,925 bytesreferences/snap-review-updates.mddoc · 1,893 bytesreferences/snap-stable-serialization.mddoc · 2,342 bytes
Read excerpt
# Vitest Best Practices
Vitest 5-compatible testing guide with 46 rules across 8 categories. Vitest 5 requires Node.js 22.12+ and Vite 6.4+; Vitest 4.1 remains on backport support.
## 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
