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antonyfmunoz
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vitest

Run deterministic unit and integration tests for TypeScript/React projects with Vitest.

1|Updated Mar 11, 2026
Search Tags:#unit tests#vitest#testing#react#coverage#jsdom#msw
One-click install
npx skills add https://github.com/antonyfmunoz/OS --skill vitest-antonyfmunoz
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/antonyfmunoz/OS/tree/main/skills/tools/vitest
Command: npx skills add https://github.com/antonyfmunoz/OS --skill vitest-antonyfmunoz

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest removes the friction of setting up and running fast, dependable unit and integration tests by reusing the same Vite toolchain you already trust for production builds.

Core Features & Use Cases

  • Jest-compatible developer experience: Use familiar describe/it/expect/vi semantics while enjoying Vite-native speed and ESM-first behavior.
  • Component testing with React Testing Library: Write reliable jsdom tests for hooks, forms, and UI interactions (including common shadcn/Radix stubs).
  • Network mocking with MSW v2: Validate behavior by mocking at the request layer instead of brittle fetch-overrides.
  • Coverage with practical thresholds: Generate fast v8 coverage reports and enforce quality gates to prevent regressions.

Quick Start

Run Vitest to execute your current test suite and generate a coverage report suitable for CI quality thresholds.

Frequently Asked Questions about vitest

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I mock API requests with MSW v2 in Vitest unit tests?▼

Set up Vitest unit tests for React components by configuring the jsdom environment and global test APIs. You then write reliable tests for UI interactions using React Testing Library, including common shadcn/Radix UI component stubs.

Does Vitest work with React Hook Form and Zod validation testing?▼

Vitest handles async behavior in TanStack Query tests by using fresh QueryClient instances for isolation. You apply async-aware assertions like expect.poll and proper fake-timer handling to ensure deterministic unit and integration testing.

Why should I use Vitest instead of Jest for React component testing?▼

Generate fast v8 coverage reports in Vitest to enforce practical quality thresholds and prevent regressions. You configure coverage settings to output reports suitable for CI quality gates, ensuring reliable test suite validation.

Can I use vi.mock and vi.spyOn hoisting patterns in Vitest?▼

You can use vi.mock and vi.spyOn hoisting patterns correctly in Vitest to isolate modules and track function calls. These hoisted patterns ensure mocks are applied before module imports, preventing race conditions during test execution.

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