Function parseTestMetadata

test/common/index.js:92–129

* Parse test metadata from the specified file. * @param {string} filename - The name of the file to parse. * @returns {{ * flags: string[], * envs: Record * }} An object containing the parsed flags and environment variables.

(filename = process.argv[1])

 * }} An object containing the parsed flags and environment variables.
 */
function parseTestMetadata(filename = process.argv[1]) {
  // The copyright notice is relatively big and the metadata could come afterwards.
  const bytesToRead = 1500;
  const buffer = Buffer.allocUnsafe(bytesToRead);
  const fd = fs.openSync(filename, 'r');
  const bytesRead = fs.readSync(fd, buffer, 0, bytesToRead);
  fs.closeSync(fd);
  const source = buffer.toString('utf8', 0, bytesRead);

  const flagStart = source.search(/\/\/ Flags:\s+--/) + 10;
  let flags = [];
  if (flagStart !== 9) {
    let flagEnd = source.indexOf('\n', flagStart);
    if (source[flagEnd - 1] === '\r') {
      flagEnd--;
    }
    flags = source
      .substring(flagStart, flagEnd)
      .split(/\s+/)
      .filter(Boolean);
  }

  const envStart = source.search(/\/\/ Env:\s+/) + 8;
  let envs = {};
  if (envStart !== 7) {
    let envEnd = source.indexOf('\n', envStart);
    if (source[envEnd - 1] === '\r') {
      envEnd--;
    }
    const envArray = source
      .substring(envStart, envEnd)
      .split(/\s+/)
      .filter(Boolean);
    envs = Object.fromEntries(envArray.map((env) => env.split('=')));
  }

  return { flags, envs };
}

// Check for flags. Skip this for workers (both, the `cluster` module and
// `worker_threads`) and child processes.