sanand0/vitest-dom
agents/vitest-dom/SKILL.md
Use vitest + jsdom for fast, lightweight unit tests for front-end apps
$ install --global
skillsauthnpx skillsauth add sanand0/scripts vitest-domInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: May 4, 2026, 4:20 AM151.5s1 file scanned
SKILL.md
- name:
- vitest-dom
- description:
- Use vitest + jsdom for fast, lightweight unit tests for front-end apps
- Use vitest and jsdom for front-end testing.
- Avoid
vitest.config.*; default ESM import works, launch via"test": "npx -y vitest run"inpackage.json. Addjsdomas adevDependency. Addnpm testtoprepublishOnly - Treat tests as lightweight integration, not unit. Load the full HTML + scripts and verify real DOM mutations; ensures refactors don't silently break UI wiring.
- Log browser
console.*output. - Mount local HTML.
settings.fetch.virtualServers = [{url:"https://test/", directory: <root>}]. Usepage.goto("https://test/...")to load files without a dev-server. - Create a fresh page for each test to isolate
window,document, etc. - Fake timers for deterministic testing.
- Call
vi.useFakeTimers()inbeforeAll,vi.useRealTimers()inafterAll. - Re-bind
window.setTimeout = setTimeoutso app code sees the mocked clock. - Drive async paths with
vi.advanceTimersByTime(ms)instead ofawait sleep.
- Call
- Stub external APIs with
vi.fn()- e.g.window.fetch = vi.fn(() => Promise.resolve({ok:true,...}))avoids network and lets you assert payloads. - Spy on side-effects -
vi.spyOn(console, "error"), clipboard reads, etc.; alwaysmockRestore()afterwards to prevent bleed-through. - Add timeouts per test case, e.g.
{ timeout: 10_000 }, for long-running tests.
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