End-to-end testing is done to make sure that the application behaves as expected and the flow of actions from starting to end is complete without any issue. To explain with an example, suppose you are the end user and you are using an app to book a flight. First, you will launch the app and click on the flight’s icon on the home page. Then you will enter the destination, date, and other required details. Now you will choose your preferred flight, book the seat, enter the passenger details, and make the payment. Once this is done, you will get the ticket and a follow-up email on your registered email ID.
Now in this scenario, if the screen takes a lot of time to load the next page or if the book button does not work then this will be an unpleasant experience for the user. So we can figure out if there are any issues from the start to the end of the process. It’s not just about the UI functioning, but also the data encryption and security, information flow between other internally used platforms integrated to the app, proper functioning of the firewall and more. This is where end-to-end testing comes into the picture to make sure that everything works well under any circumstances.
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