Composing a user interaction with further assertions

composable-test.js

// :missingUsername visits a page and immediately clicks submit
// without entering the user's name. It returns the chrome instance
// so you can invoke further actions or assertions!
const missingUsername = (chrome) => 
  chrome.goto('http://localhost:3000/')
  .then(() => chrome.click('[data-test="submit"]'));

// Consume the prior action and assert further behavior
it('should allow users to dismiss errors', () => {
  return missingUsername(chrome)
      .then(() => chrome.click('[data-test="error"] button'))
      .then(() => chrome.exists('[data-test="error"]'))
      .then((errorExists) => expect(errorExists).toEqual(false));
  });
});