What is End-to-End Testing, and How is It Connected To End User Experience?

Software testing is an important phase of the software development life cycle. The more extensive and regressive the test process is, the higher the chances of accuracy, which means there will be fewer defects and software breakdowns. End-to-end testing is a testing method that tests an application workflow from the beginning to the end.

End-to-end testing replicates user scenarios to validate integration and data integrity. End-to-end testing is one of the testing types supported by Selenium  that checks how the functionality works for an end user. Automating the testing process offers a lot of benefits. There are high chances that the level of testing accuracy will be too high, unlike in the manual approach, where human testers are prone to making errors. Also, automating end-to-end testing will lead to great coverage and ensure that all processes are carried out per user requirements. In terms of saving time, you can save much more time with automated testing than when using the manual testing approach.

To carry out effective end-to-end testing, there are three categories of activities that you must include in your testing.

User functions

One of the main objectives of end-to-end testing is to test the end user’s experience. In this case, real user scenarios are simulated and validated by different systems and components for integration and data integrity. To build great user functions, ensure that you list the features of the software and all the subsystems that are interconnected to the software.


To build conditions based on the user functions, you must decide a set condition for every user function. These conditions include timing or other data conditions. After that, the focus should be on any other factor affecting user functions. 

Test cases

To create great test cases for end-to-end testing, you need to create multiple test cases that will enable you to test every functionality of the user functions. For every test condition, ensure that you assign at least a single or separate test case.

There are generally two types of end-to-end testing.

Horizontal E2E testing

This testing is performed horizontally across the context of multiple applications. It takes place easily in a single Enterprise Resource Planning application. It evaluates an application in its entirety, and you will need to know the whole workflow across all the applications connected to the software. The benefits of horizontal E2E testing include increased thoroughness and breadth. Horizontal E2E testing centers mainly on user-friendliness, as you will get the exact idea of the actual user experience.

Vertical end-to-end testing

With the end-to-end testing, the testers will first split the application into different layers and test the components of each layer independently. This is usually done in hierarchical order. For instance, application layers’ requests related to the API and UI database calls.

Vertical testing has lots of benefits. It’s appropriate for software products where safety and broad code coverage are incredibly important. Using this approach will make it easier to test faster than with horizontal end-to-end testing.

Factors to consider in tracking E2E progress

For the end-to-end process to be effective, you must follow certain factors that will lead to better results.

Test case preparation

In your testing, are all test cases created to test different functionalities in line with the user requirements? The reports for the test case preparation should clearly show the rate at which current vs. planned test cases are being created. Without great test case preparation, most of the test scenarios are going to fail. 

Ensure the team members are aware of the test cases that should be carried out and the necessary tools in place to carry out the process. You can use test automation tools to prepare the test case scenarios. Unlike the manual approach, it will help you reduce errors when creating test scripts.

Defect details

According to your research and customer feedback, what defects have you noticed in your software products? You must keep details of the defects identified, opened, or closed each week. Distributing defects based on priority will help the testers keep track of the bugs and supervise the resolution.

All processes involved in the defects’ correction should be well-documented for referencing purposes. Some errors may happen during the testing process, and the testers must check out the testing process to make the right corrections.

Test environment

What is the availability of the test environment? Cloud automated testing is highly preferred because its environment is stable and supports great scalability. When carrying most of your tests on the cloud, you increase the ability to increase or decrease the resources needed to meet the changing needs.

Remember that you may end up discovering more defects than you had planned for before. Check the accessibility of the test environment and compare the amount of time scheduled for testing vs. the time you spent on the previous test cases.

Read: The Integration of Social Media Within the Website Design


All software products must go through end-to-end testing to ensure they can accomplish what they are built for. Depending on the organization’s needs, you can choose horizontal or vertical end-to-end testing. Any of the two processes will lead to great quality control in the software development industry.