Advantages of ABAP Unit Tests 

With complete test coverage of the functional units of a test unit and regressive testing – that is, tests after any change to the TU – you significantly improve the quality of your software. With ABAP Unit, you can execute all tests in a TU at the touch of a button. Of course, the significance of any test also depends on the quality of the test data. You should consider your test data carefully and make sure that it covers all borderline cases. However, you should pay particular attention to testing the everyday cases, which make up some 90 per cent of regular operation. While this does not guarantee that your software will be completely free of errors, it will significantly reduce the number of errors and messages you receive. Furthermore, integration tests focus more on errors resulting from the interaction between individual components and you will have fewer errors caused by deficiencies of individual components.