> Part of the problem with unit tests that mock everything is that they are very time consuming to write. Minor changes in how classes interact result in 5x the

> Part of the problem with unit tests that mock everything is that they are very time consuming to write. Minor changes in how classes interact result in 5x the time needed to update unit tests. Unit tests are supposed to verify a software unit's design contract. If a minor change breaks your design contract then either the change is not minor at all or you have more serious problems to deal with than writing unit tests.