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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.
Why is Testing Necessary. In this section we will discuss the necessity of Software Testing. Errors,Faults and Failures are occurred while developing the Software Project.We can illustrate these points with the true story Mercury spacecraft.The computer program ABOA spacecraft contained the following statement with the FORTRAN programming language.rrors,Faults and Failures are occurred while developing the Software Project. We can illustrate these points with the true story Mercury spacecraft. The computer program ABOA spacecraft contained the following statement with the FORTRAN programming language.