typing_test.js

(async() => {
  const browser = await startPuppeteerBrowser(process.argv);

  console.log('Create page');
  const page = await browser.newPage();

  console.log('Go to https://rounded-haze.glitch.me/');
  await page.goto('https://rounded-haze.glitch.me/');

  console.log('Wait for 1 second');
  await new Promise(r => setTimeout(r, 1000));

  const text = 'Some longer text that is a bit long';
  for (let i = 0 ; i < 500 ; i++) {
    await page.type('input', text);
    const inputValue = await page.evaluate(() => document.querySelector('input').value);
    await page.evaluate(() => document.querySelector('input').value = '');
    if (inputValue != text) {
      throw new Error('Wrong value: ' + inputValue);
    }
  }

  console.log('Close the browser');
  await browser.close();
})();