Regression Testing - Online Article

The   motive of regression testing is to make sure that any change, such as a   bug fix, should not introduce any new bug. Regression testing can be   used for effective testing of a system by selecting minimum number of   tests needed to test the affected change. Most common methods   of regression testing include re-running of previously run tests and   then verifying whether the program behavior has undergone any changes as   well as identifying if any previously fixed faults have re-emerged or   not. The main reason for carrying out regression testing is that it gets   difficult for a programmer or a developer to identify how a   modification in one part of the software affects other parts of the   software. This is addressed by doing a comparison of results of previous   tests with the results of the current tests being run.
In every software development company, regression testing is one of a quality control measure to ensure that the currently modified code is still in accordance with its specified requirements and is not at all affecting the unmodified code brought by any changes done to the software. Minimum amount of time must be spent when conducting regression tests, focusing on adequate coverage of the software to detect new failures in the previously tested code.   Any   change or even a slight modification in software can break the existing   functionality of an application. It has been observed that a software   fix can lead to occurrence of other bugs which in turn can deeply affect   the quality and reliability of the system.
Every custom software development organization follows different strategies for regression testing. Some strategies and factors to consider during this process include the following.

  • Test fixed bugs promptly. 
  • Keep   an eye on what all can be the side effects of bug fixes. It may be   possible that a bug itself might be fixed but that fix might cause   occurrence of other bugs.
  • Write a regression test for every bug fixed. 
  • If in case, any two or more tests are identical, try to figure out which test is less effective and get rid of the same. 
  • Figure out the tests that the program consistently faces and archive them. 
  • Rather than focusing on design or cosmetic issues, focus on functional issues of an application.

The   ideal process would be to create an extensive set of test cases and run   it after each and every change. Unfortunately, for many projects this   is just impossible because of multiple reasons such as the test cases   are too large, changes keep coming in rapidly, or testing must be done   on various hardware and OS platforms.
With   each change in the software, Regression Testing could become more and   more expensive. To make the Regression Testing cost effective and yet   ensure good coverage, following techniques can be applied:

Test Automation: Regression testing can be automated. Testing is done using   scripts after each change is introduced in the system. It helps   eliminate human errors and result in faster and cheaper execution of   Test cases. However, there is cost involved in building the scripts.

Selective Testing: Another method is to execute the test cases selectively. All the test   cases are not executed during the Regression Testing. The only part that   seems relevant is tested. This helps reduce the testing time and effort.

About the Author:

Nick Thomas is the author of this article. He has been writing articles for many custom software development related organizations like Q3 technologies. Moreover, he has been actively involved in providing useful content writing material related tosoftware development company.


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