what is regression testing?

Answer Posted / krishna

when a defect is reported in the s/w,the developper makes
some change to the s/w to remove that defect,it is likely
that the change made in the code may lead to another defect
that may not be visible immediately..

so regression testing is done precisely to ensure that
change in one part of s/w has no ill effect on other parts
of the s/w.

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