The test_delegator patches were useful for working out and testing the use of the gui resource.

However, they are not appropriate for testing the Delegator class. It is a standalone class that has nothing to do with tkinter; in fact, the file has no imports. The test should be a normal text-only test. The only import needed is unittest.

Delegator has two unused methods. We can delete them, leaving just 4 methods to test.