I’ve being doing TDD for a year or so and the part I have struggled with the most is testing private methods. Should you test them at all? If so, how do you test them?

Michael Feathers’ book “Working Effectively with Legacy Code” has this to say about it:

“This question comes up over and over again from people new to unit testing: “How do I test private methods?”. Many people spend a lot of time trying to figure out how to get around this problem, but […] the real answer is that if you have the urge to test a private method, the method shouldn’t be private; if making the method public bothers you, chances are, it is because it is part of a separate responsibility: it should be on another class.”