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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.
System testing is important because of the following reasons: 1  System testing is the first step in the Software Development Life Cycle, where the application is tested as a whole. 2  The application is tested thoroughly to verify that it meets the functional and technical specifications.