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Resource profile / Vitest Testing Workflow
About this skill

Workflow & requirements

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 5.0.1, generated at 2026-09-25.

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
Test Tags Label tests with tags to filter runs and apply shared options features-test-tags
Reporters Built-in reporters, default selection, CI/output config features-reporters
Benchmarking Write benchmarks with the bench fixture (Tinybench) features-benchmarking

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
PACKAGE TRANSPARENCY

Inspect before installing

Source: Anthony Fu · MIT · SHA-256 shown alongside the download.

24 files47852 ZIP bytes0 script/code files

License file included. A license and checksum are not a security certification. Review package instructions and scripts before running them.

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vitest/SKILL.md3708 bytes
Machine-readable installation guide →
CATALOG REVIEW NOTES

Know what you need before installing

Source and packaging checks recorded on 2026-10-03. These notes are not safety certification or measured task performance.

Requirements

A compatible Node/Vite/Vitest project. Optional DOM, browser, coverage and type-check tooling require their own dependencies; snapshot examples include version-specific APIs.

Costs, access & practical limits

MIT skill material; separate tooling, hosting, dependencies and model access may have costs. No external tool or account is supplied. Full skill/agent runtime evaluation has not been performed. Independent documentation-derived proof-of-concept maintained by Anthony Fu; upstream says skill effectiveness has not been fully tested. Check matching framework and package versions. Preferences are not mandatory framework rules, and code samples may be separate alternatives rather than complete files. Coverage percentages and mocked tests do not establish full application quality. Browser, DOM, API and integration behavior need separate validation; verify version-specific v5 examples.

View the recorded checks
  • Pinned source bytes verified against Git blob hashes
  • Complete upstream MIT copyright and license retained
  • Core name/folder identity and packaged references checked
  • Publisher attribution, dependency and version limitations disclosed

Upstream commit: e53a142a2420e8cd812cfe9ed0484ab01bc856aa

Runtime status: not tested by this catalog. Configure your client and test the skill in your own environment.

SCENARIOS

Inputs, criteria and recorded outcomes

Records are supplied by the site administrator and bound to a specific package. They are not third-party safety certification. This page does not execute skills.

No published scenario records yet. Resource availability and download counts do not imply measured task performance.

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