As we saw earlier with Karma, we can write unit tests that will make sure that our code in the controllers is working well; however, it would fall short if you wanted to run automated User Acceptance Tests (UAT) or run tests that simulate user-driven interactions with the browser. For running such tests, we'll need to use another new tool called Protractor.

Protractor replaces the earlier AngularJS scenarios as the default End-to-End testing framework for testing AngularJS apps.

Protractor runs on WebDriver.js, which in turn makes use of the Selenium Server. Selenium is one of the most popular browser-automation tools. In this section, we will see how to set up a standalone instance of Selenium Server, install Protractor, and run a default set of End-to-End tests with it.

Let's first install Protractor by running the following command in the terminal:

sudo npm install –g protractor

This will install Protractor globally.