> Anyone who's ever had to work on a system that had copious unit tests deep within will know the pain of not just changing code to fix a bug, but having to change a half-dozen tests because your function interfaces have now changed and a healthy selection of your tests refuse to run anymore.
In my experience this problem tends to be caused by heavily mocking things out more so than the unit tests themselves. Mocking things out can be a useful tool with its own set of downsides, but should not be treated as a requirement for unit tests. Tight coupling in your codebase can also cause this, but in that case I would say the unit tests are highlighting a problem and not themselves a problem.
Perhaps you're talking about some other aspect of unit tests? If that's the case then I'd love to hear more.
In my experience this problem tends to be caused by heavily mocking things out more so than the unit tests themselves. Mocking things out can be a useful tool with its own set of downsides, but should not be treated as a requirement for unit tests. Tight coupling in your codebase can also cause this, but in that case I would say the unit tests are highlighting a problem and not themselves a problem.
Perhaps you're talking about some other aspect of unit tests? If that's the case then I'd love to hear more.