A semi-automatic method for testing program code is disclosed. The method includes executing a program code, and capturing at least one current state of the system under test. The method includes providing a modified version of the program code, thus providing a modified system under test, and executing the modified program code and capturing a modified state of the modified system under test. The method includes comparing the current state of the system under test and the modified state of the modified system under test and detecting changes in the system under test. The method includes displaying at least part of the detected changes to a user and soliciting corresponding user input in terms of applying or discarding the displayed changes. The method includes applying or discarding the detected changes based on the corresponding user input by automatically updating the current state of the system under test.