Test cases

​Test cases verify details of a program functionality. A program without test cases is a poor quality program. A developer needs not only focus on developing any software, but needs to focus on developing good quality software.

Test cases may have different percentages of coverage, a developer needs to strive for 100% of coverage.

If modules are being used, then there no reason to write test cases for the module itself. I hope people who developed that module did good testing before releasing that module. However, it is needed to write test cases for invocation of that module.

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