Regression testing may definitely be performed manually, and it is also performed by re-executing a subset of complete and full test cases or by using some sort of automated capture playback tools too.
1.Regression testing increases our chances of detecting bugs caused by changes to a software and application- either enhancements or defect fixes. Also keep one thing in mind that we also dont give any sort of guarantee that for performing regression testing there are never any sort of side effects also.
2.Regression testing also detects undesirable side caused always by changing the operating environment.
3.The set about regression test is much useful for a new way about doing integration testing. This new mode is quite faster and little confusing than the old way about doing integration testing- but you always need a some sort of set about regression test to do it.
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