gistfile1.js

  it('should refuse partial submissions', function(done) {
    var browser = this.browser;
    browser.fill('first_name', 'John');
    browser.pressButton('Send').then(function() {
      assert.ok(browser.success);
      assert.equal(browser.text('h1'), 'Contact');
      assert.equal(browser.text('div.alert'), 'Please fill in all the fields');
    }).then(done, done);
  });

  it('should keep values on partial submissions', function(done) {
    var browser = this.browser;
    browser.fill('first_name', 'John');
    browser.pressButton('Send').then(function() {
      assert.equal(browser.field('first_name').value, 'John');
    }).then(done, done);
  });

  it('should refuse invalid emails', function(done) {
    var browser = this.browser;
    browser.fill('first_name', 'John');
    browser.fill('last_name', 'Doe');
    browser.fill('email', 'incorrect email');
    browser.fill('message', 'Lorem ipsum');
    browser.pressButton('Send').then(function() {
      assert.ok(browser.success);
      assert.equal(browser.text('h1'), 'Contact');
      assert.equal(browser.text('div.alert'), 'Please check the email address format');
    }).then(done, done);
  });

  it('should accept complete submissions', function(done) {
    var browser = this.browser;
    browser.fill('first_name', 'John');
    browser.fill('last_name', 'Doe');
    browser.fill('email', 'test@example.com');
    browser.fill('message', 'Lorem ipsum');
    browser.pressButton('Send').then(function() {
      assert.ok(browser.success);
      assert.equal(browser.text('h1'), 'Message Sent');
      assert.equal(browser.text('p'), 'Thank you for your message. We\'ll answer you shortly.'');
    }).then(done, done);
  });

The red highlighting is because the line ends with two single quote marks: ' '