I rebased my PR and updated the tests so that they would pass.  I knew 'bg' on the frame would be changed, but I was surprised by the 'state' changes.  'normal' only exists for compatibility and isn't one of the states to check in the tests; instead, 'disabled' and '!disabled' set the state and either 'disabled' appears in the tuple or it doesn't appear.  I suppose I could have changed the tests to be assertNotIn.

https://docs.python.org/3/library/tkinter.ttk.html#widget-states