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Regression Testing is a continuous testing practice that mandates re-running of functional & non-functional tests to ensure that the software continues to perform in the same manner as it did before making any changes. Qentelli's structured approach to Regression Testing ensures minimal disruption while keeping costs under control. Leverage on our regression testing services to keep your business-critical applications ready for frequent changes.

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Regression Testing, a part of Functional Testing Services which ensures that the modifications like functional enhancements, bug fixes, patches, and releases did not introduce new errors into the existing codes or to check whether modifications successfully eliminated existing errors. Regression Testing services provided by Qentelli offers maximum test coverage with a minimum number of test cases, which leads to the minimal cost of appraisal and risk.


Commonly Used Regression 
Testing Approaches

Retest All:


A retest all approach aims to re-test the entire software suite. Usually majority of testing is automated using a wide range of assorted tools and test-led development practices to. However, lack of human intervention could also be lead to increase in errors. So, it’s imperative to have an error monitoring tool.

Regression Test Selection:


This software regression testing technique is a way of selecting the most appropriate test case to ensure that it delivers the correct result. It thus enables a tester to select a valid set of test cases to make sure the unmodified part of the program is error free.

Test Case Prioritization:


The goal in this Regression testing approach is to prioritize a limited set of test cases such that the more potentially impactful tests are executed ahead of all less critical tests.

Hybrid Regression Testing:


Hybrid regression testing combines test selection and test case prioritization techniques. Here, the selected test cases from a test suite are prioritized for re-execution.

Types Of Regression Testing


Corrective Testing

Corrective regression testing is performed by reusing the existing test cases when no changes are made in the product.


Selective Testing

When new code is added, then selective regression testing is performed by using a subset of existing test cases. It is a cost-effective regression testing approach that requires fewer efforts from QA experts.


Progressive Testing

Progressive regression testing is performed when software gets an update. It helps to ensure that existing features are not affected or compromised by the update. To achieve that, QA experts create new test case scenarios.


Unit Testing

Unit regression testing is used to test a specific code unit separately by blocking all interactions and dependencies prior to testing.


Complete Testing

Complete regression testing approach involves comprehensive retesting to spot any bugs that can arise as a result. Complete regression testing also ensures root code is not affected.

Insights on Regression Testing

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Regression Testing FAQ's

What is Regression Testing?

Regression Testing is a Software Testing type in which test cases are re-executed in order to check whether the previous functionality of the application is working fine and the new changes have not introduced any new bugs. 

This test can be performed on a new build when there is a significant change in the original functionality that too even in a single bug fix.

When To Perform Regression Test?

Regression Testing is usually performed after verification of changes or new functionality. But this is not the case always. For the release that is taking months to complete, regression tests must be incorporated in the daily test cycle. For weekly releases, regression tests can be performed when the Functional Testing is over for the changes. 

Regression checking is a variation of retest (which is simply to repeat a test). When Retesting, the reason can be anything. Say, you were testing a particular feature and it was the end of the day- you could not finish testing and had to stop the process without deciding if the test passed/failed. 

The next day when you come back, you perform the test once more – that means you are repeating a test you performed before. The simple act of repeating a test is a Retest. 

Regression test at its core is a retest of sorts. It is only for the special occasion that something in the application/code has changed. It might be code, design or anything at all that dictates the overall framework of the system. 

A Retest that is conducted in this situation to make sure that the said change has not made an impact on anything that was already working before is called Regression Test. The most common reasons why this might be conducted are because new versions of the code have been created (increase in scope/requirement) or bugs have been fixed.

How to do Regression Testing?

In order to do Regression Testing process, we need to first debug the code to identify the bugs. Once the bugs are identified, required changes are made to fix it, then the regression testing is done by selecting relevant test cases from the test suite that covers both modified and affected parts of the code. 

Software maintenance is an activity which includes enhancements, error corrections, optimization and deletion of existing features. These modifications may cause the system to work incorrectly. Therefore, Regression Testing becomes necessary. Regression Testing can be carried out using the following techniques:

  • Retest All: 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. This is very expensive as it requires huge time and resources.
  • Regression Test Selection: Regression Test Selection is a technique in which some selected test cases from test suite are executed to test whether the modified code affects the software application or not. Test cases are categorized into two parts, reusable test cases which can be used in further regression cycles and obsolete test cases which can not be used in succeeding cycles.
  • Prioritization of Test Cases: Prioritize the test cases depending on business impact, critical & frequently used functionalities. Selection of test cases based on priority will greatly reduce the regression test suite.