When doing unit tests, you have probably found yourself in the situation of having to create objects over and over again. To do this, you must call the class constructor with the corresponding parameters. So far, nothing unusual, but most probably, there have been times when the values of some of these fields were irrelevant for testing or when you had to create nested "dummy" objects simply because they were mandatory in the constructor.
All this has probably generated some frustration at some point and made you question whether you were doing it right or not; if that is really the way to do unit tests, then it would not be worth the effort.