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1 As it not possible makes it software application is defect free but testing will be necessary. 2  Most important thing of testing is the development environment is different than the Testing environment and the testing done on testing environment is similar to the Production environment. Most important thing of testing is the development environment is different than the Testing environment and the testing done on testing environment is similar to the Production environment.
...this analysis is too simplistic! In fact, even though diversity in testing is important and powerful, and even though the argument against repetition is generally valid, I do know of ten exceptions. There are ten specific reasons why, in some particular situation, it is not unreasonable to repeat tests. It may even be important to repeat some tests.