A test case is a set of unit tests that, together, verify that a function behaves as expected in various situations. Good test cases take into account the variety of inputs that a function might receive, and include tests for all of these scenarios. Full coverage testing The trial includes a complete set of unit tests that cover every possible way to use the function. For large projects, full coverage is possible
It can be hard. Typically, you can initially write tests for important behavior of your code, and then consider full coverage when your project is widely used.