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Examples Of Regression Testing

Controlling regression defects often becomes quite complex when the application has a larger scope and it requires the team to make frequent code changes. If you categorize the test cases, testing becomes easier and faster. Let’s see the 2 categories under which you can distribute your test cases. Monitoring the metrics help to check the proficiency of the entire software life cycle.

In such cases, the documentation should be up to the mark for newbies. A hybrid approach to execute selected as well as prioritized test cases.

What Is Integration Testing? A Simple Guide On How To Perform Integration Testing

Developer testing compels a developer to focus on unit testing and to include both positive and negative test cases. Regression testing can be a crucial step in the software development process. Additionally, regression testing allows software developers to continuously improve current software products and applications. In this article, we’ll explore what regression testing is, the importance of regression testing, how to do it and when it’s appropriate to execute a regression test. Confining regression testing to only the current version of code under development in an iteration runs the risk of creating a waterfall dynamic.

  • When there are localized changes that don’t need complete regression testing.
  • And if you need more advanced features like assertions or workflows configuration, you can write your own code in Groovy.
  • Software regression testing when taken up, identifies defects early and helps to reduce the cost to resolve and fix issues early.
  • Whenever a new modification is added to the code, regression testing is applied to guarantee that after each update, the system stays sustainable under continuous improvements.
  • There are many applications that have an elaborate UI and need UI regression testing to be automated for best performance at all times.
  • Execute regression test cases, whenever changes made in code, perform bug fixing, new functionality added, and also an enhancement to existing functionality done.
  • Make sure that regression suite reports are transparent, and that you can see the real results of test executions over time.

Typically, the combination of test automation and manual testing offers the most comprehensive and effective regression testing solution. This allows for automated tests that produce errors to be followed up by actual testers to determine the exact problem and solution. To build your regression test suite doesn’t necessarily require a lot of work. The suite can be created from the existing test cases – functional tests, integration ios vs android development tests, unit tests, etc. – that you probably developed from day one. Anything that has previously successfully verified that the software functions as intended can be used in your regression suite. There are many applications that have an elaborate UI and need UI regression testing to be automated for best performance at all times. There are many automated testing tools that offer codeless automation of UI regression testing.

Regression Testing Tool, Give Testsigma A Whirl!

This phase is achieved with an effective collaborative approach established between stakeholders, developers, and software test engineers. Therefore, a common consensus is required to decide upon the test cases that need to be prepared which could be reused each time there is a change in the application. Agile implementation of regression testing plays a key role in aligning the existing and updated functionalities, avoiding all possible rework in the future. Agile regression testing ensures the business functions are stable and sustainable. Katalon Studio provides an all-in-one regression testing tool for your website, web services, and mobile application. The tool also supports running scripts on multiple devices, browsers, and environments.

If manually done, though, regression testing can be extremely time-consuming and error-prone, which leads us to our next point. Developers should always keep in mind that all the changes they make, no matter how small, simple, or insignificant they seem, have the potential to cause surprising side effects. They can break functionalities that don’t have anything to do with the changes being made.


In this case, the regression tests help in testing the new code change in every iteration to make sure that tested application continues to perform correctly after every iteration. Software maintenance is the process of modifying a software application which includes improvements, bug fixing, deletion of existing features, and optimization. When we do these modifications, the system may work incorrectly. To avoid issues while modifying the code, we do follow regression testing techniques. These techniques help us to eliminate the risks associated with the modifying code. Introducing change in a large, coherent code base is often tricky.

what is regression testing

Regression testing is executed in order to ensure that the bug fix didn’t cause any abruption in the application’s intended functionality. When some bugs are found to be occurring as a result of the bug fix, those are known as regression bugs.

Types Of Regression Testing

It helps organizations to deliver a quality product by ensuring that the code change should not affect the existing functionality. Assume there is an application which has a functionality to ‘Add’, ‘Save’, and ‘Delete’. These functions allow users to add data, save data and delete data. As a tester, you have to verify the introduction of a new feature (ie., Update) impacting the existing features (such as ‘Add’, what is regression testing ‘Save’, and ‘Delete’ functions) or not. Perfecto can help you leverage automated regression testing — and test more, faster. Explore for 240 free minutes, test real user conditions, and get detailed analytics. On another note, regression testing helps developers to focus their efforts on building new functionalities for the application rather than keep on returning to check for defects in the old features.

But there might be a possibility that the fix may have introduced or uncovered a different defect elsewhere in the software. The way to detect these ‘unexpected side-effects’ of fixes is to do regression testing. Another instance when regression testing can be used is when software developers analyze a software program’s performance after initiating program changes or modifications. Regression testing can allow programmers to make sure that software programs retain their optimum performance capabilities.

#5 When There Is An Environment Change.

Make sure the job is done right the first time and it will reward you with a high-quality product and happier stakeholders, along with a short development lifecycle. Bugs found while testing is not only meant to be detected and fixed.

How long should regression testing take?

This test is often a short one (often takes 1-2 hours to perform).

Execute regression test cases, whenever changes made in code, perform bug fixing, new functionality added, and also an enhancement to existing functionality done. Update the regression suite whenever required, like if any new defect which not covered in a test case found, update test case for that issue in a test suite. Regression test is required even when a very small change is done in the code because this small modification can bring unexpected issues in the existing functionality. This testing becomes very important when there are continuous modifications or enhancements done in the application or product. These changes or enhancements should NOT introduce new issues in the existing tested code. During confirmation testing the defect got fixed and that part of the application started working as intended.

#2 Partial Regression

In short, automating your regression tests enables far greater code coverage at a lower cost than would be possible with strictly manual regression testing. Depending on the product, QA experts can choose either manual testing, automated testing, or both. While manual regression testing works best during the first phases of software development cycle, it is a time-consuming procedure that requires a lot of resources. Automated testing, on the other hand, simplifies the process, saving time and efforts. Regression tests can be run as functional tests, to verify the overall usability of the end product or feature.

How do you measure regression testing coverage?

You simply take: 1. (A) the total lines of code in the piece of software you are testing, and.
2. (B) the number of lines of code all test cases currently execute, and.
3. Find (B divided by A) multiplied by 100 – this will be your test coverage %.

Once you’ve considered these elements, you can set up the regression suite and schedule your regression tests. Regression Testing is absolutely essential to minimize the number of issues reported by customers post release. But there are times when the managers and stakeholders don’t realize the importance of regression testing and thus, don’t assign the what is regression testing time for it. If the regression test cases are automated, much time won’t be lost even if all the test cases were executed. Thus, in such a scenario, how much regression testing does not need to be thought about. Regression Testing could be automated or could be performed manually depending on what processes are adopted by an organization for a product.

Partial Regression Testing

Selenium has the support of some of the largest browser vendors who have taken steps to make Selenium a native part of their browser. It is also the core technology in countless other browser automation tools, APIs and frameworks. Retest All- This is the technique where test engineers execute all the existing test cases without any miss. This is quite expensive as it requires huge time and resources. To determine how widespread of an effect a change or build has on the software, the team can perform an impact analysis. Accordingly, an impact analysis informs the collection of test cases for the subsequent test cycle.

what is regression testing

That is why the complete regression approach fits better in certain contexts — for example, when the application is adjusted for a new platform or language, or when the operating system gets a major update. This technique checks all the test cases on the current program to check its integrity. Though it is expensive as it needs to re-run all the cases, it ensures that there are no errors because of the modified code. This is one of the methods for Regression Testing in which all the tests in the existing test bucket or suite should be re-executed. As most of the test cases used in Regression Testing are selected from the existing test suite and we already know their expected outputs.

A Top 8 Regression Testing Test Case Checklist

The people who are performing the tests could be doing more valuable tasks. Such tasks could have the potential to generate way more value. Finally, since the manual process is error-prone, then people are bound to make mistakes, which will result in losses.


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