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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.
White box testing looks inside the object being tested and uses that knowledge as part of the testing process. So, for example, if it is known that a certain variable is designed to take values within a specific range, a test might check what happens when that variable is given values around its extremes.