Testing that is focused on functions that a system should not allow is an example of what type of testing?

Testing how a system could be misused, or misuse case testing, focuses on behaviors that are not what the organization desires or that are counter to the proper function of a system or application. Use case testing is used to verify whether a desired functionality works. Dynamic testing is used to determine how code handles variables that change over time, whereas manual testing is just what it implies: testing code by hand.