I have thought about factoring out common test code into helper functions either within test_configdialog or in a new module.  One example: simulate a click on a listbox, with common before and after code.  Another: Testing the group of selection widgets on both theme and keys pages. (If I were not planning to replace this group, we could factor out a SelectionFrame and put an instance on each page.)

We might do some such refactoring after this, before HighPageTest.  Keep notes on redundancies you notice that might be candidates.