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The attached patch fixes the test failures with Tk 8.5.9, I haven't tested with other versions or other platforms.
The change to 'test_traversal' should be sane.
The change to 'test_tab_identifiers' is more phishy. I've done two changes there: (1) slightly different index to test for tab 0, as layout on OSX needs more space and (2) the code assumes that tab("idx") won't raise an exception, I've added a TclError catch to ensure that other locations get tested as well.
With these changes the tests pass, but I'd like a review from someone that knows about tkinter and ttk before committing.