Mastering Flask

User interface testing

In order to test the high level of our application's code, and to create system tests, we will write tests that work with browsers and verify that the UI code is functioning properly. Using a tool called Selenium, we will create Python code that hooks into a browser and controls it purely from code. You find elements on the screen and then perform actions on those elements by having Selenium. Click on it or input keystrokes. Also, Selenium allows you to perform checks on the page content by giving you access to the elements' content, such as its attributes and its inner text. For more advanced checks, Selenium even gives an interface to run arbitrary JavaScript on the page. If the JavaScript returns a value, it is automatically ...