Running Tests

Commands

Command	Description
npm test	Run tests in watch mode (re-runs on changes)
npm run test:run	Single test run (CI-friendly)
npm run test:coverage	Generate coverage report
npm run test:ui	Open Vitest UI in browser

Watch Mode

npm test

Vitest watches for file changes and re-runs affected tests. Press h in the terminal for interactive options.

Coverage

npm run test:coverage

Generates a coverage report showing which lines, branches, and functions are tested.

Vitest UI

npm run test:ui

Opens a browser-based dashboard at http://localhost:51204/__vitest__/ with:

• Test file browser
• Individual test results
• Re-run capabilities
• Coverage visualization

Configuration

Vitest is configured in vitest.config.ts:

import { defineConfig } from 'vitest/config'

export default defineConfig({
  test: {
    environment: 'happy-dom',
    setupFiles: ['./tests/setup.ts'],
  }
})