Answer Posted / ansari m
Suppose that you've tested a product thoroughly and found no
errors. Suppose that the product is then changed in one area
and you want to be sure that it still passes all the
tests it did before the change - that the change didn't
introduce any new defects. Testing to make sure the software
hasn't taken a step backwards or "regressed", is called
"regression testing".
If you run the different tests after each change, you have
no way of knowing for sure that no new defects were
introduced. Consequently, regression testing must run the same
tests each time. Sometimes new tests are added as the
product matures, but the old tests are kept too. The only
practical way to manage regression testing is to automate it.
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