Working example of selenium-webdriver and tape (I think)

index.js

test.only('Show error on missing credentials', function (t) {
  t.plan(1);
  browser.get('http://localhost:3000/');
  browser.findElement({ className: 'login__submit' })
    .click();
  var error = browser.wait(Until.elementLocated({ className: 'login__error' }));
  browser.wait(Until.elementIsVisible(error))
    .then(function () {
      t.ok(true);
    });
  browser.quit();
});