What Is Regression Testing ?

Introduction:

Regression Testing is a vital thing of software trying out, ensuring that changes to the codebase do now not introduce new mistakes or regressions into the software. This method allows hold the steadiness and reliability of the software after modifications were made.

When to do Regression Testing?

Regression Testing is usually accomplished underneath the following situations:
When new capability is added to the system, requiring modifications to the prevailing codebase.
After figuring out and debugging defects in the software program to fix problems.
When optimizing the codebase to improve performance or performance.

Process of Regression Testing:

Identifying Changes: Modifications are made to the supply code for various reasons, together with adding new capabilities or fixing defects.
Debugging: The modified code is debugged to perceive any added insects or errors.
Test Case Selection: Test cases are selected from the prevailing take a look at suite to cover the modified and affected elements of the code. New check instances may be brought if important.
Regression Testing: The decided on test instances are finished to make sure that the adjustments have no longer added any new errors into the software program.

Techniques for Test Case Selection:

Select all take a look at instances: All take a look at cases from the prevailing suite are selected, ensuring complete coverage but may not be efficient.
Select take a look at cases randomly: Test instances are randomly selected from the suite, which is much less generally used as it assumes all test cases are equally effective.
Select change traversing test instances: Only take a look at cases covering the changed parts of the code and affected regions are selected.
Select better priority check instances: Test instances are assigned precedence codes primarily based on their importance and effectiveness, with better precedence cases selected for regression testing.

Tools for Regression Testing:

Several automated gear are available for regression trying out, together with Selenium, WATIR, QTP, RFT, Winrunner, and Silktest. These equipment help automate the regression testing method, saving time and making sure consistency.

Advantages of Regression Testing:

Ensures that new functionalities do now not introduce new bugs into the system.
Easily automatic the usage of current take a look at cases and automatic gear.
Helps hold the satisfactory and balance of the codebase.

Disadvantages of Regression Testing:

Can be time and resource-ingesting with out automated equipment.
Required even for small code changes, which may additionally boom testing overhead.

Regression Testing performs a essential role in software improvement, helping maintain the reliability and pleasant of software program merchandise despite ongoing changes and updates. While it requires careful planning and execution, the benefits of regression trying out outweigh the challenges, ensuring a robust and mistakes-unfastened software system.