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vitest

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by sanity-io · part of sanity-io/next-sanity

Vitest fast unit testing framework powered by Vite with Jest-compatible API. Use when writing tests, mocking, configuring coverage, or working with test…

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🧰 Not standalone. This skill ships with sanity-io/next-sanity and only works together with that tool — install the tool first, then add this skill.

This is the playbook your agent receives when the skill activates — you don't need to read it to use the skill, but it's here to audit before installing.

by sanity-io

Vitest fast unit testing framework powered by Vite with Jest-compatible API. Use when writing tests, mocking, configuring coverage, or working with test… npx skills add https://github.com/sanity-io/next-sanity --skill vitest Download ZIPGitHub950 Vitest is a next-generation testing framework powered by Vite. It provides a Jest-compatible API with native ESM, TypeScript, and JSX support out of the box. Vitest shares the same config, transformers, resolvers, and plugins with your Vite app.

Key Features:

  • Vite-native: Uses Vite's transformation pipeline for fast HMR-like test updates

  • Jest-compatible: Drop-in replacement for most Jest test suites

  • Smart watch mode: Only reruns affected tests based on module graph

  • Native ESM, TypeScript, JSX support without configuration

  • Multi-threaded workers for parallel test execution

  • Built-in coverage via V8 or Istanbul

  • Snapshot testing, mocking, and spy utilities

The skill is based on Vitest 3.x, generated at 2026-01-28.

Core

Topic Description Reference Configuration Vitest and Vite config integration, defineConfig usage core-config CLI Command line interface, commands and options core-cli Test API test/it function, modifiers like skip, only, concurrent core-test-api Describe API describe/suite for grouping tests and nested suites core-describe Expect API Assertions with toBe, toEqual, matchers and asymmetric matchers core-expect Hooks beforeEach, afterEach, beforeAll, afterAll, aroundEach core-hooks

Features

Topic Description Reference Mocking Mock functions, modules, timers, dates with vi utilities features-mocking Snapshots Snapshot testing with toMatchSnapshot and inline snapshots features-snapshots Coverage Code coverage with V8 or Istanbul providers features-coverage Test Context Test fixtures, context.expect, test.extend for custom fixtures features-context Concurrency Concurrent tests, parallel execution, sharding features-concurrency Filtering Filter tests by name, file patterns, tags features-filtering

Advanced

Topic Description Reference Vi Utilities vi helper: mock, spyOn, fake timers, hoisted, waitFor advanced-vi Environments Test environments: node, jsdom, happy-dom, custom advanced-environments Type Testing Type-level testing with expectTypeOf and assertType advanced-type-testing Projects Multi-project workspaces, different configs per project advanced-projects