What is Regression Testing?

It is a routine process for the development team of any company to add, remove or modify the features of a software as the project progresses. However, one unwanted outcome of this constant changing and chopping is that some connected components may not work as expected after the change is carried out.

Regression Testing is a type of Functional Testing used to verify that a change in code has not affected the functionality of any other component of the system. So, Regression testing is initiated when a debugger fixes any bug or a programmer adds new lines code to modify, add or remove a functionality because there can be one or more dependencies in the newly modified or current functionality.

As a part of Regression Testing, the testing engineers re-execute a part or all of the previous test cases to make sure everything is hunky dory.

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Benefits of Regression Testing

By now we know that Regression Testing is particularly useful to check the system behaviour when some modification or bug fix has been performed.

Just like any other testing, Regression Testing can be performed using multiple approaches with the best (tedious, however!) being a ‘TEST ALL’ approach. It provides absolute assurance that the change has in no way altered the behaviour any component of the software.

In agile software development—where the software development life cycles are very short, resources are scarce, and changes to the software are very frequent—regression testing might introduce a lot of unnecessary overhead.

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