make your browsers test for you article source code. 01_webdriver_js_wrapper_src.js

01_webdriver_js_wrapper_src.js

driver.findElement(webdriver.By.name('whoami'))
  .sendKeys('WebDriver was here!');

driver.findElement(webdriver.By.id('greet'))
  .click();

driver.findElement(webdriver.By.id('message'))
  .getText()
  .then(function(val) {
    assert.equal(
      val, 'WebDriver was here!',
      'Messages should be the same');
  });