Write unit tests with Vitest

Write unit and integration tests with Vitest

Writing fast, Jest-compatible unit and integration tests for Vite projects with concurrent execution and type-safe TypeScript support.

• · Vite project source code
• · Test cases and mocking requirements

• · vitest.config.ts configuration file
• · .test.ts files with describe/it blocks
• · Coverage reports and snapshot files

• · Vitest npm package
• · Vite bundler
• · jsdom (if testing DOM) or node environment

• · Vite project initialized
• · Node.js and npm installed
• · TypeScript configured (recommended)

• · Import resolution fails if Vite alias not configured
• · Tests hang on infinite loops or unresolved promises
• · Snapshots become stale after code changes
• · jsdom environment crashes on DOM manipulation

• · Vitest is Vite-native (same build pipeline)
• · Jest API compatibility reduces migration friction
• · Reference files provided for config, mocking, and assertions