vitest

SKILL.md

Status: Production Ready Last Updated: 2026-02-06 Vitest Version: 4.x Vite Compatibility: 6.x

| jest.fn() | vi.fn() | | jest.mock() | vi.mock() | | jest.spyOn() | vi.spyOn() | | jest.useFakeTimers() | vi.useFakeTimers() | | jest.clearAllMocks() | vi.clearAllMocks() | | @jest/globals | vitest |

Build fast unit and integration tests with Vitest 4.x. Covers configuration for Workers/React/Node, vi.mock/vi.spyOn patterns, snapshot testing, in-source testing, workspace configuration, and browser mode. Use when: setting up tests, migrating from Jest, mocking modules, testing React components, or configuring monorepo workspaces. Keywords: vitest, test, unit test, vi.mock, vi.spyOn, snapshot, coverage, Jest migration. Source: jezweb/claude-skills.

Open your terminal or command line tool (Terminal, iTerm, Windows Terminal, etc.) Copy and run this command: npx skills add https://github.com/jezweb/claude-skills --skill vitest Once installed, the skill will be automatically configured in your AI coding environment and ready to use in Claude Code or Cursor

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