Testing is performed for many reasons but there are at least two reasons we have to mention. One is to hunt for bugs and create error-free code as much as possible. The other is to prove that the application is usable and can be utilized for the purpose it was meant for. It is important from the enterprise point of view and considers a lot of aspects that the unit test does not. While the unit test focuses on one unit and, thus, is an extremely good tool to point out where the error is, it is totally unusable when it comes to discovering bugs that come from erroneous interfaces between modules. The unit tests mock external modules and, thus, tests that the unit works as expected. However, if there is an error in this expectation ...
Types of tests
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