Generally when you are writing software you will write a test case. This is a test model that will be used in development to prove something works and help find bugs in the software. For instance, let's presume that I had written a software package that will look up a phone number. In my test case, I would list how it is input in the program, what phone number I will use, and what the expected outcome will be if it works, and all errors if it does not work. The idea behind using a test case is that you are testing with consistent information. Your test case will need to include the options for input and expected output. This keeps testing for all modules the same and therefore it is much easier to troubleshoot applications.
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