Works on linux.  I just had one question on github about a test for sizelist and moving the initialization of the Tk variables into setUp.

I also deleted a second comment that was just a wrong comment, but it's led me to another question.

For test_indent_scale, you have the widget test and the `changes` test in the same place.  I know you mentioned that you had thought about this before, but now that you have the widget tests for the font name, font bold, (and soon) font size, would there be any reason to split the test_font_set tests into the same place where each of the widgets is tested?  That way, all the pieces of the graph flow would be in one place for each widget/Tk Variable/trace function.