Regression testing is used in software to confirm that a recent programmes or code change has not negatively impacted existing features. Regression Testing is a full or partial re-execution of previously executed test cases to check that current features work properly. This testing guarantees that new code modifications do not interfere with existing functions. It ensures the old code continues to function after the most recent code changes. In this blog will discuss A Comprehensive Guide to Regression Testing in Software Testing. Enrolling in the Software Testing Courses in Chennai would ensure individuals nourish their skills.
What is Regression Testing, and Why is It Important?
When software is created, it must be constantly maintained. New updates and important changes are made on a regular basis to ensure that the program runs properly. Following these significant enhancements to the software, it will be tested to make ensure that the code continues to perform effectively. Regression testing refers to the process of rerunning code to ensure its functionality.
Regression testing is crucial because it informs developers whether changes made to software have had a negative impact on how well that program operates. Without regression testing, a developer will not be able to spot defects or bugs in freshly updated software or determine whether new changes to the code impacted how well the previously existing code functions.
When to Perform this Test
Under the following conditions, a regression test should be run:
- When a new feature is added to existing code.
- When new patch fixes are released
- When any changes have been made to the code’s configuration
- When the codebase is fixed to eliminate bugs
- When the source code is optimized to boost its performance.
- When there is an issue with performance
When a bug is discovered, attempting to remedy it may result in the introduction of further bugs, which means disaster for the product if not addressed soon. A regression test should be done as frequently as feasible, notwithstanding its difficulty. This assures that an upgrade has no negative long-term consequences.
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Types of Regression Testing
A regression test can be performed in a variety of methods. These are the numerous types of regression testing:
Retest-all Regression Testing
This method involves running a completely new test on the code. It is a very detailed type of regression testing. It is usually performed when something appears to be incorrect. This type of regression testing yields more pleasing findings, but because it is so thorough, it is also fairly expensive to perform.
Corrective Regression Testing
This is a basic type of regression testing. This method focuses on conducting a regression test despite the fact that no code has changed. Test cases established previously can be utilized to execute the test in this type of testing.
Selective regression test
This method examines a specific area of code that has been impacted by selecting a subset of cases from a wider collection. This method seeks to assess the influence of new code on existing code.
Progressive Regression Testing
This type of regression testing is done after implementing new changes. New test cases are utilized instead of obsolete ones in this type of regression testing. This type of test ensures that none of the previous version’s critical features have been broken in the current one.
Unit Regression Testing
The code is tested as a single unit in this sort of regression testing. When the test is running, this method will demand that all existing interactions and dependencies be halted.
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