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Regression testing
Regression testing is testing performed after changes to a system to detect whether new errors were introduced or old bugs have reappeared. It should be done after changes to requirements, new features added, defect fixes, or performance improvements. There are various strategies for regression testing including re-running all tests, test selection, test prioritization, and focusing on areas like frequently failing tests or recently changed code. While regression testing helps ensure system quality, managing large test suites over time poses challenges in minimizing tests while achieving coverage. Automating regression testing can help address these challenges.
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Regression testing
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- 2. Today's Topics Whatis regression testing? When to do it? What’s the strategy? Pros and cons Conclusion
- 3. What is thisterm “Regression” Regression means errors that occurs due to some action or activities in a system. In IT world a "regression" means the return of a bug. Regression testing means the testing process that is done to find the regressions in the system after doing any changes in the product.
- 5. When to doit Regression Testing is required when there is a - Change in requirements and code is modified according to the requirement New feature is added to the software Defect fixing Performance issue fix
- 6. What’s the strategy? 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 following techniques:
- 7. What’s the strategy? Continues.. Reset 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.
- 8. What’s the strategy? Continues.. Regression Test Selection Instead of re-executing the entire test suite, it is better to select part of test suite to be run. Test cases selected can be categorized as 1) Reusable Test Cases 2) Obsolete Test Cases. Re-usable Test cases can be used in succeeding regression cycles. Obsolete Test Cases can’t be used in succeeding cycles.
- 9. What’s the strategy? Continues.. 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.
- 10. What’s the strategy? Continues.. Area to focus during testing Test cases which have frequent defects. Functionalities which are more visible to the users. Test cases which verify core features of the product. Test cases of Functionalities which has undergone more and recent changes. All Integration Test Cases. All Complex Test Cases. Boundary value test cases. Sample of Successful test cases. Sample of Failure test cases
- 11. Pros and Cons Challenges for regression testing With successive regression runs, test suites become fairly large. Due to time and budget constraints, the entire regression test suite cannot be executed. Minimizing test suite while achieving maximum test coverage remains a challenge. Determination of frequency of Regression Tests , i.e., after every modification or every build update or after a bunch of bug fixes, is a challenge.
- 12. Pros and Cons To ensure effective regression tests , observe the following : Code being regression tested should be under a configuration management tool. No changes must be allowed to code , during the regression test phase. Regression test code must be kept immune to developer changes. The database used for regression testing must be isolated . No database changes must be allowed
- 13. Conclusion An effectiveregression strategy, save organizations both time and money. But in current time it more refers to the termAutomate, Automate, Automate Following are most important tools used for both functional and regression testing: Quick Test Professional (QTP) Rational Functional Tester (RFT) Selenium
- 14. References http://en.wikipedia.org/wiki/Regression_testing http://www.guru99.com/regression-testing.html http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=613 2961&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2F abs_all.jsp%3Farnumber%3D6132961 http://www.scribd.com/doc/6095386/Effective- Regression-Testing-Strategy http://blogs.msdn.com/b/imtesty/archive/2007/01/10/regr ession-testing-strategies.aspx http://thinktesting.wordpress.com/2010/11/23/regression- testing-strategic-and-risk-driven-can-you-afford-not-to/
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