Don't agree. Refactoring does not mean that you need to refactor the tests, but that you will be testing other pieces. That is, when you refactor the old piece

Don't agree. Refactoring does not mean that you need to refactor the tests, but that you will be testing other pieces. That is, when you refactor the old pieces are still there (in the libraries), and their tests still work, but you are maybe not using them anymore higher up in the hierarchy.