vitest/test/coverage-test/testing.mjs

import { startVitest } from 'vitest/node'

// Set this to true when intentionally updating the snapshots
const UPDATE_SNAPSHOTS = false

const provider = process.argv[1 + process.argv.indexOf('--provider')]

const configs = [
  // Run test cases. Generates coverage report.
  ['test/', {
    include: ['test/*.test.*'],
    exclude: ['coverage-report-tests/**/*'],
    coverage: { enabled: true },
  }],

  // Run tests for checking coverage report contents.
  ['coverage-report-tests', {
    include: [
      ['c8', 'istanbul'].includes(provider) && './coverage-report-tests/generic.report.test.ts',
      `./coverage-report-tests/${provider}.report.test.ts`,
    ].filter(Boolean),
    coverage: { enabled: false, clean: false },
  }],
]

for (const threads of [true, false]) {
  for (const [directory, config] of configs) {
    await startVitest('test', [directory], {
      ...config,
      update: UPDATE_SNAPSHOTS,
      threads,
    })

    if (process.exitCode)
      process.exit()
  }
}