[issue31002] IDLE: Add tests for configdialog keys tab

[Terry J. Reedy]

Terry J. Reedy added the comment:

Great.  It is non-trivial, so I don't expect perfection first try.  Please revise docstring with explanation of how page works, like with Font and General pages.  I finished tests using those explanations as a guide.  They are also a guide for review.

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<http://bugs.python.org/issue31002>
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