Before https://github.com/facebook/react/pull/14917, I used to get this:

<img width="502" alt="screen shot 2019-02-21 at 5 38 03 pm" src="https://user-images.githubusercontent.com/810438/53190100-cbe20d00-3600-11e9-9ffa-b230f3bb78fe.png">

await browser.close();
  }
};
const run = async ({cwd}) => {
  await logPromise(
    exec('node build-all.js', {cwd: join(cwd, 'fixtures/packaging')}),
    'Generating "packaging" fixture',
    20000 
  );
  let errorMessage;
  let response;
  try {
    response = server.start({
      port: 9000,
      directory: cwd,
    });
    errorMessage = await logPromise(
      validate(),
      'Verifying "packaging" fixture'
    );
  } finally {
    response.close();
  }
  if (errorMessage) {
    console.error(theme.error(errorMessage));
    process.exit(1);
  }
};
module.exports = run;