Function runSingleTest

test/web-platform-tests/wpt-runner.mjs:333–422

(url, options, expectation, timeout = 10000)

}

function runSingleTest (url, options, expectation, timeout = 10000) {
  const startTime = Date.now()
  const { promise, resolve, reject } = Promise.withResolvers()
  // NODE_EXTRA_CA_CERTS is required for HTTPS/WSS pages, but it causes the
  // WebSocket-over-HTTP/2 WPT variants to exit without emitting harness output.
  const useExtraCACerts = !(url.pathname.startsWith('/websockets/') && url.searchParams.get('wpt_flags')?.includes('h2'))

  const proc = spawn('node', [
    '--expose-gc',
    '--no-warnings',
    join(import.meta.dirname, 'runner/test-runner.mjs'),
    url.toString()
  ], {
    stdio: ['ignore', 'pipe', 'pipe'],
    env: {
      ...process.env,
      NO_COLOR: '1',
      ...(useExtraCACerts ? { NODE_EXTRA_CA_CERTS: CA_CERT_PATH } : {})
    }
  })

  const cases = []
  let harnessStatus = null
  let stdoutOutput = ''
  let stderrOutput = ''
  let error

  const timer = setTimeout(() => {
    if (!proc.killed) {
      proc.kill('SIGINT')
    }
  }, timeout)

  proc.stdout.setEncoding('utf-8')
  proc.stdout.on('data', (chunk) => {
    stdoutOutput += chunk

    let delimiterIndex
    while ((delimiterIndex = stdoutOutput.indexOf('#$#$#')) !== -1) {
      const endIndex = stdoutOutput.indexOf('\n', delimiterIndex)
      if (endIndex !== -1) {
        const message = stdoutOutput.slice(delimiterIndex + 5, endIndex)
        try {
          const { tests, harnessStatus: _harnessStatus } = JSON.parse(message)
          harnessStatus = _harnessStatus
          cases.push(...tests)
        } catch {
          console.error('Failed to parse:', message)
        }
        stdoutOutput = stdoutOutput.slice(endIndex + 1)
      } else {
        break
      }
    }
  })

  proc.stderr.setEncoding('utf-8')
  proc.stderr.on('data', (chunk) => {