async function executeRaw (command, options = {}) {
  options.cwd = path.join(__dirname, '..', 'fixtures');
  options.env = {
    PATH: process.env.PATH
  };

  const parts = command.split(' ');
  if (parts[0] === 'qunit') {
    parts[0] = JSON.stringify(process.execPath) + ' ../../../bin/qunit.js';
  }
  if (parts[0] === 'node') {
    parts[0] = JSON.stringify(process.execPath);
  }

  const cmd = parts.join(' ');
  const spawned = cp.exec(cmd, options);

  return await getProcessResult(spawned);
}
Executes the provided command from within the fixtures directory.

This variation of execute() exists to allow for pipes.

@param {string} command