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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.
Testing can exist without checking. A test can exist without a check. But checking is a very popular and important part of ordinary testing, even very informal testing. Checking is a process that can, in principle be performed by a tool instead of a human, whereas testing can only be supported by tools.