abhisheksharma-17/vitest
skills/vitest/SKILL.md
Next-generation testing framework powered by Vite — test API, matchers, mocking, snapshots, coverage, browser mode, type testing, CLI, and advanced patterns. MANDATORY TRIGGERS: vitest, Vitest, vitest.config, vi.mock, vi.fn, vi.spyOn, expect matchers, test coverage vitest, vitest browser mode. Also trigger when user wants to write unit tests with Vite, configure test coverage, mock modules in ESM, run browser-based component tests, benchmark code, test TypeScript types, or migrate from Jest. When in doubt about whether to use this skill for JavaScript/TypeScript testing tasks, use it.
$ install --global
skillsauthnpx skillsauth add abhisheksharma-17/skills-graph vitestInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: May 4, 2026, 3:24 AM49.4s17 files scanned
SKILL.md
- name:
- vitest
- description:
- Next-generation testing framework powered by Vite — test API, matchers, mocking, snapshots, coverage, browser mode, type testing, CLI, and advanced patterns. MANDATORY TRIGGERS: vitest, Vitest, vitest.config, vi.mock, vi.fn, vi.spyOn, expect matchers, test coverage vitest, vitest browser mode. Also trigger when user wants to write unit tests with Vite, configure test coverage, mock modules in ESM, run browser-based component tests, benchmark code, test TypeScript types, or migrate from Jest. When in doubt about whether to use this skill for JavaScript/TypeScript testing tasks, use it.
- license:
- MIT
- version:
- 1.0.0
- author:
- Abhishek Sharma
- tags:
- ["vitest", "testing", "vite", "unit-tests", "mocking", "coverage", "snapshots", "browser-testing", "typescript", "esm"]
Vitest — Skill Router
Next generation testing framework powered by Vite.
Source: vitest.dev | Package: vitest v4.x | License: MIT
Reference Files
| Reference | File | Read When |
|-----------|------|-----------|
| Overview & Setup | references/00-overview.md | Getting started, installation, configuration, why Vitest |
| Writing Tests | references/01-writing-tests.md | test, describe, it, hooks, lifecycle, context, fixtures |
| Assertions & Matchers | references/02-assertions.md | expect, toBe, toEqual, asymmetric matchers, custom matchers |
| Mocking | references/03-mocking.md | vi.fn, vi.spyOn, vi.mock, module mocking, partial mocking |
| Timers & Dates | references/04-timers-dates.md | Fake timers, vi.useFakeTimers, vi.setSystemTime, date mocking |
| Snapshots | references/05-snapshots.md | toMatchSnapshot, inline, file snapshots, serializers |
| Coverage | references/06-coverage.md | v8, istanbul, thresholds, reporters, per-file config |
| Browser Mode | references/07-browser-mode.md | Component testing, Playwright provider, DOM assertions |
| CLI & Reporters | references/08-cli-reporters.md | vitest run, watch, bench, reporters, sharding, filtering |
| Type Testing | references/09-type-testing.md | expectTypeOf, assertType, typecheck config |
| Environments | references/10-environments.md | jsdom, happy-dom, edge-runtime, custom environments |
| Advanced Patterns | references/11-advanced-patterns.md | Projects, parallelism, in-source testing, debugging, migration |
Installation
# Install
npm install -D vitest
# Run tests
npx vitest
# Run once (CI)
npx vitest run
# With coverage
npx vitest run --coverage
Quick Reference
- Docs: https://vitest.dev
- GitHub: https://github.com/vitest-dev/vitest
- npm: https://www.npmjs.com/package/vitest
- Config: https://vitest.dev/config/
- API: https://vitest.dev/api/
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