Features

• Vite's config, transformers, resolvers, and plugins
• Use the same setup from your app to run the tests!
• Component testing for Vue
• Out-of-the-box TypeScript / JSX support
• ESM first, top level await
• Filtering, timeouts, concurrent for suite and tests
• Chai built-in for assertions + Jest expect compatible APIs
• Tinyspy built-in for mocking
• happy-dom or jsdom for DOM mocking

Chai and Jest expect Compatibility

Chai is built-in for assertions plus Jest expect-compatible APIs

Mocking

Tinyspy is built-in for mocking with jest-compatible APIs on vi object

import { expect, vi } from 'vitest'

const fn = vi.fn()

fn('hello', 1)

expect(vi.isMockFunction(fn)).toBe(true)
expect(fn.mock.calls[0]).toEqual(['hello', 1])

fn.mockImplementation(arg => arg)

fn('world', 2)

expect(fn.mock.results[1].value).toBe('world')