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vitest

Run Jest-compatible unit tests for Vite projects with Vitest.

1|1|Updated Apr 18, 2026
Search Tags:#vitest#testing#jest#vite#mocking#unit-testing#snapshot
One-click install
npx skills add https://github.com/rodrigobranas/formacao_ia_arq_t1_4 --skill vitest-rodrigobranas
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/rodrigobranas/formacao_ia_arq_t1_4/tree/main/mastra-rag/.agents/skills/vitest
Command: npx skills add https://github.com/rodrigobranas/formacao_ia_arq_t1_4 --skill vitest-rodrigobranas

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest provides a fast, Jest-compatible testing framework designed for Vite projects, enabling quick feedback during development and CI.

Core Features & Use Cases

  • Vite-native: uses Vite's transformation pipeline for fast test updates
  • Jest-compatible: drop-in replacement for most Jest test suites
  • Smart watch mode: reruns only affected tests based on module graph
  • Native ESM, TypeScript, JSX support out of the box
  • Multi-threaded workers for parallel test execution
  • Built-in coverage via V8 or Istanbul
  • Snapshot testing, mocking, and spy utilities
  • Suitable for unit, integration, and fixture-driven tests

Quick Start

Install Vitest in your project, then run tests with the Vitest CLI.

Frequently Asked Questions about vitest

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

FAQPage Schema
How do I run unit testing in a Vite project without slow feedback loops?▼

Vitest uses Vite's transformation pipeline for unit testing, providing fast test updates and quick feedback during development. It reruns only affected tests based on the module graph in smart watch mode.

Can I migrate my Jest test suite to Vite without rewriting tests?▼

Vitest is Jest-compatible and serves as a drop-in replacement for most Jest test suites. It supports familiar mocking, spy utilities, and snapshot testing while running natively on Vite.

Does Vitest support TypeScript, JSX, and ESM out of the box?▼

Vitest provides native ESM, TypeScript, and JSX support out of the box. It leverages Vite's transformation pipeline so no extra configuration is needed for modern frontend syntax.

What is the best way to measure code coverage during unit testing in Vite?▼

Vitest includes built-in coverage via V8 or Istanbul directly within the testing framework. You can generate coverage reports while running unit tests without requiring additional external plugins.

How does Vitest handle parallel test execution for large suites?▼

Vitest uses multi-threaded workers to execute tests in parallel. This ensures fast, deterministic test execution across unit, integration, and fixture-driven scenarios by distributing workloads efficiently.

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