Vitest

# Run files containing "user"
vitest user

# Multiple patterns
vitest user auth

# Specific file
vitest src/user.test.ts

# By line number
vitest src/user.test.ts:25

# Tests matching pattern
vitest -t "login"
vitest --testNamePattern "should.*work"

# Regex patterns
vitest -t "/user|auth/"

# Uncommitted changes
vitest --changed

# Since specific commit
vitest --changed HEAD~1
vitest --changed abc123

# Since branch
vitest --changed origin/main

# Tests whose loaded files have a newer mtime than the test's last run (no Git needed)
vitest run --since-last-run

# Only tests that failed last time (read from the results cache; needs `cache` enabled)
vitest run --last-failed
vitest run --last-failed -t login   # combinable with other filters

vitest related src/utils.ts src/api.ts --run

// .lintstagedrc.js
export default {
  '*.{ts,tsx}': 'vitest related --run',
}

test.only('only this runs', () => {})

describe.only('only this suite', () => {
  test('runs', () => {})
})

defineConfig({
  test: {
    allowOnly: true, // Allow .only in CI
  },
})

test.skip('skipped', () => {})

// Conditional
test.skipIf(process.env.CI)('not in CI', () => {})
test.runIf(!process.env.CI)('local only', () => {})

// Dynamic skip
test('dynamic', ({ skip }) => {
  skip(someCondition, 'reason')
})

// vitest.config.ts
defineConfig({
  test: {
    tags: [{ name: 'db' }, { name: 'slow' }, { name: 'flaky' }],
  },
})

// test file
test('database test', { tags: ['db'] }, () => {})

vitest --tagsFilter "db && !flaky"
vitest --tagsFilter "unit || e2e"
vitest --list-tags            # show defined tags

defineConfig({
  test: {
    // Test file patterns
    include: ['**/*.{test,spec}.{ts,tsx}'],
    
    // Exclude patterns
    exclude: [
      '**/node_modules/**',
      '**/e2e/**',
      '**/*.skip.test.ts',
    ],
    
    // Include source for in-source testing
    includeSource: ['src/**/*.ts'],

    // Scope discovery to a directory (faster than broad excludes)
    dir: './src',
  },
})

vitest --project unit
vitest --project integration --project e2e

const isDev = process.env.NODE_ENV === 'development'
const isCI = process.env.CI

describe.skipIf(isCI)('local only tests', () => {})
describe.runIf(isDev)('dev tests', () => {})

# File pattern + test name + changed
vitest user -t "login" --changed

# Related files + run mode
vitest related src/auth.ts --run

vitest list                 # Show all test names
vitest list -t "user"       # Filter by name
vitest list --filesOnly     # Show only file paths
vitest list --json          # JSON output