End to End Testing Vs Regression Testing

Testing is an essential element of any application development process. Continuous testing is vital in ensuring no issues in the code. With the help of a thorough testing procedure, we can rest easy because we are confident that the final version will have fewer to no errors. End to end testing and regression testing are two testing methods of automation testing that have been increasingly popular in recent years. Both of these testing methods are unique approaches to testing. Both testing types include verifying a product’s functionality from beginning to end. Because of these similarities, there is a widespread misunderstanding that end-to-end testing and regression testing are the same things, or that end-to-end testing includes all aspects of regression testing. 

But there are a few distinct functions of these two types of testing. In this article, we compare and contrast end-to-end testing with regression testing, discussing its definition and the advantages and challenges faced by them.

What is end-to-end testing?

End-to-end testing is a beginning-to-end type of workflow. It is an approach used to ensure an application works as expected from start to finish, using real-world data and conditions to simulate the final product’s release. This covers not only the application’s software components but also its network, database, and API infrastructure.

Because of the nature of the testing, probably, end-to-end testing cannot always be performed in the typical testing environment. In its place, a post-release environment, either simulated or actual, is frequently required. The test runs through every possible action the app may take, checking for issues with hardware, network anomalies, additional dependencies, databases, and other apps. In most cases, end-to-end testing is carried out after functional and system testing have been completed.

It is possible to compare end-to-end testing to user acceptance testing (UAT) since testers will attempt to simulate end-user actions, such as completing a transaction on the website. On the other hand, business users conduct UAT, while technical testers and QA specialists conduct end-to-end testing. Since end-to-end testing gauges the overall performance of the integrated system rather than that of individual applications, it is essentially business process testing.

Benefits of End-to-end testing

End-to-end testing’s major objective is to boost users’ confidence in the program by doing exhaustive and ongoing testing of its many components. The more thorough the testing procedures are, the less likely users will encounter errors in the final versions. The majority of today’s companies operate on a sophisticated, multi-platform architecture. For instance, your organization might run applications on and off the cloud, making it necessary to monitor how well integrations work. End-to-end testing is particularly useful for testing heterogeneous systems since it examines all three layers of an application, i.e., the database, the back end, and the front end.

It verifies the functionality of the app 

You may be assured that your software is completely functional by putting it through end-to-end testing, which checks its operation from beginning to end, on different platforms and as a whole. at the same time, it offers insights on application efficiency across various end-user environments, which helps in making sure that the experience provided to end users is functioning as intended.

Increases the Scope of the Tests

End-to-end testing helps to ensure quality further and reduce risk by taking into account how services and subsystems interact with one another. This is accomplished by expanding test coverage beyond what is typically considered in more isolated testing practices.

Captures Errors

In a modern environment for software development using Agile or DevOps, testing is typically performed either every iteration or every few iterations. This ensures that errors are discovered and fixed as quickly as possible. This decreases the likelihood that bugs will become hidden deep within a product, where they will be difficult to find and even more challenging to fix.

Decreases Effort and Expenditure 

End to end testing lowers the need to rerun tests because it ensures that there are fewer errors and breakdowns in delivered products. This, in turn, results in a reduction in the costs and amount of time connected with testing.

End-to-end Testing Challenges 

During the end-to-end testing process, one of the most significant challenges is the design of the workflow. In order for testers to simulate the journey that end users take through an application, they need to write and execute a large number of tests that are identical to one another. 

The amount of time and effort required for maintenance increases proportionally with the test suite size. Testers who focus on end-to-end testing confront a number of challenges, one of which is the creation and maintenance of test environments. Since end-to-end testing aims to simulate real users’ activities, it cannot be carried out exclusively in the development setting. The production setting is not always accessible and may be subject to interruptions during testing, such as the installation of software upgrades. 

When conducting end-to-end testing in the correct manner, large-scale test automation becomes an absolute requirement. Instead of focusing their energy on maintaining current tests and configuring tools and environments, testers should write new tests and assess the outcomes of previously run tests. A test automation framework that cuts down on maintenance work, automates test case, and lets you run tests in parallel can save you a lot of time and effort can be most helpful.

What is Regression Testing?

Regression testing aims to verify that the system continues to function as expected after it has been modified. The fundamental objective of regression testing is to ascertain whether or not changes or updates to the source code have adversely affected the functionality of the original code. Testing of this kind is typically carried out following a release, update, bug patch, or the inclusion of new features. 

Testers need merely to re-run the test cases they already have in order to carry out regression testing. Depending on the type of change, regression testing can be done with only some or all of the test cases that were already there.

Advantages of Regression Tests

The most important advantage of performing regression testing is finding bugs at an earlier stage in the software development life cycle (SDLC). Regression testing is essential to any continuous integration and delivery pipeline since it analyzes the system’s stability after each modification. It helps to avoid excessive reworks, which in turn reduces the likelihood of post-deployment faults and, ultimately, user discontent. Regression testing ensures the safety of workflow in the same way that end-to-end testing does by confirming the consistency of business procedures.

More test cases in lesser time 

Testing requires a significant investment of both time and effort in order to cover the complete software. Nevertheless, regression testing runs the scenarios that were chosen and verifies that the features operate without any problems. In addition, other data inputs or devices can be used for each iteration of the test.

Finding bugs quickly 

A company can determine which bug in the program is generating issues as a result of recent software updates through regression testing. To get rid of the issues, engineers can start replacing the application code with a suitable value or edit the code themselves.

Producing quality applications 

The use of regression testing helps ensure that the system is stable while also continuously improving the application. It performs the same actions repeatedly, assuring that the software is of good quality and allowing the team to complete development cycles more quickly.

Find ways to save costs while also boosting efficiency

Reducing the size of the team and the amount of human interaction required to run regression tests is one way that businesses can save money. At the same time, resources are freed up to focus on activities that are more strategic and significant.

Prompt intervention 

Thanks to regression testing, the company has the opportunity to determine which parts of the software are causing issues. Then they can replace those parts in order to speed up the application’s processing. 

Regression Testing Challenges

As your program expands to incorporate additional features, the scope of regression testing should expand to accommodate this expansion. Although it is not necessary to build new test cases, the existing ones will be run multiple times to ensure they continue functioning properly. 

There is no immediate benefit to conducting regression tests. What’s the point of re-testing functionality that was developed months or years ago, questions management? Isn’t it better to put that energy towards creating something that will bring in money? Regression testing is sometimes overlooked in favor of more pressing tasks because testing teams need help to rationalize its value.

After each new build, regression testing must be performed. For a sophisticated product, these processes can take from days to weeks if carried out manually. To put it another way, in an environment where development sprints typically last for two weeks can effectively halt any forward motion. Even when fully automated, regression testing can still cause delays in the agile feedback loop if not streamlined.

Manual regression testing incurs a large opportunity cost due to the constant need for human labor. Paying the payroll of one or more testers is practically necessary only to perform regression tests for most businesses. Unless you choose open source, which typically translates to higher development and setup expenses, automating the process entails an initial investment in development, debugging the regression automated tests, and tooling.

End-to-End Testing vs Regression Testing

The workflow is the primary area of focus in end-to-end testing. It does this by identifying problems that are linked with the subsystem or integrations and then verifying the flow of business operations. It is conducted in an environment that is either a simulation of production or a genuine device, and it is designed to emulate the end user’s experience. These Tests are executed repeatedly all the way through the SDLC process. There is a requirement for the development of test cases.

The objective of regression testing is to ensure that newly implemented features do not interfere with those that were previously operational. It does this by guaranteeing that any modifications made to the system do not disrupt the operation of previously written code, hence validating the flow of business processes. The tests are carried out in a setting that simulates the production environment. Tests are executed immediately after a change in the programming or the release of a new version. There are already test cases prepared, and they will be run again.


When contrasting end-to-end testing with regression testing, the benefits and drawbacks of each approach reveal some of the most striking parallels between the two types of testing. For instance, one of the most significant challenges that testers experience in both forms of testing is the presence of huge testing suites and, as a result, an increase in the number of repeating testing cycles. The end-to-end and regression testing methods both have the advantage of covering a wider range of testing scenarios. The most important thing for businesses to keep in mind when considering whether or not to employ either of these testing methods is that each one comes with its own unique set of maintenance issues that need to be resolved.

If you are looking for a reliable testing platform to cover your end-to-end testing and regression testing requirements then LambdaTest is a one stop platform. Regression testing saves you time and effort even if it uses a lot of resources. The agile software development lifecycle makes life easier for developers and testers while producing the highest possible output. For pixel-by-pixel comparison and visual UI mismatch detection, you may also use LambdaTest regression testing to jumpstart your visual regression testing journey.

The LambdaTest platform overall offers cloud-based browser and app testing that supports more than 3000 distinct browsers, actual devices, and OS systems. The testing giant also lets you speed up the whole process, from development to release, get quicker feedback on code changes, control erratic tests, and maintain a green master. It is, undeniably an industry-leading platform for test intelligence and automated testing procedures.