sumik5/testing-with-vitest
plugins/devkit/skills/testing-with-vitest/SKILL.md
Vitest 4.x specialized testing guide covering the test runner core: v3 to v4 migration and breaking changes (maxWorkers, test.projects, module runner, coverage overhaul), configuration (environments, coverage v8/istanbul, reporters), CLI and test filtering/tags, parallelism and performance (pools, sharding), Browser Mode (stable in v4, visual regression), fixtures and test context (test.extend), lifecycle hooks (aroundEach/aroundAll, globalSetup), mocking (vi API, modules, timers, MSW), matchers, type testing, and in-source testing. Use when package.json contains vitest or vitest.config.* is present, or when configuring, migrating, or optimizing Vitest. For framework-agnostic test methodology (TDD, AAA, test pyramid, four pillars, anti-patterns), use testing-code. For React Testing Library and React component testing, use lang:developing-react. For Playwright E2E, use testing-e2e-with-playwright.
$ install --global
skillsauthnpx skillsauth add sumik5/sumik-claude-plugin testing-with-vitestInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: Jun 23, 2026, 5:11 AM148.3s11 files scanned
SKILL.md
- name:
- testing-with-vitest
- description:
- >-
- Vitest 4.x specialized testing guide covering the test runner core:
- v3 to v4 migration and breaking changes (maxWorkers, test.projects, module runner, coverage overhaul), configuration (environments, coverage v8/istanbul, reporters), CLI and test filtering/tags, parallelism and performance (pools, sharding), Browser Mode (stable in v4, visual regression), fixtures and test context (test.extend), lifecycle hooks (aroundEach/aroundAll, globalSetup), mocking (vi API, modules, timers, MSW), matchers, type testing, and in-source testing. Use when package.json contains vitest or vitest.config.* is present, or when configuring, migrating, or optimizing Vitest. For framework-agnostic test methodology (TDD, AAA, test pyramid, four pillars, anti-patterns), use testing-code. For React Testing Library and React component testing, use lang:developing-react. For Playwright E2E, use testing-e2e-with-playwright.
testing-with-vitest
Vitest 4.x（v4.1.7）の設定・移行・最適化に特化したガイド。 Node.js >= 20、Vite >= 6 を要件とする v4 の全領域を網羅する。
詳細ガイド
詳細な手順・ガイドラインは INSTRUCTIONS.md を参照してください。
主要リファレンス
| リファレンス | 内容 | |---|---| | VITEST-V4-MIGRATION.md | v3 → v4 の破壊的変更・移行手順（maxWorkers、test.projects、module runner など） | | VITEST-CONFIG.md | 設定オプション詳細（coverage、environments、reporters、matchers、in-source testing） | | VITEST-CLI.md | CLI フラグ・フィルタリング・デバッグワークフロー | | VITEST-PROJECTS-PERFORMANCE.md | test.projects / モノレポ構成・parallelism・sharding | | VITEST-BROWSER-MODE.md | Browser Mode（v4 で stable）・ビジュアルリグレッション | | VITEST-FIXTURES.md | fixtures と test context（test.extend builder、スコープ、test.override） | | VITEST-LIFECYCLE.md | ライフサイクルフック（aroundEach/aroundAll、globalSetup、provide/inject） | | VITEST-APIS.md | expect / matchers API リファレンス | | MOCKING.md | モック戦略（vi API、モジュール、タイマー、MSW）v4 セマンティクス対応 |
関連スキル
- testing-code — TDD・AAA パターン・テスト設計方法論など、フレームワーク非依存のテスト基礎
- lang:developing-react — React Testing Library・React コンポーネントテスト
- testing-e2e-with-playwright — Playwright による E2E テスト
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