[issue19587] Remove empty tests in test_bytes.FixedStringTest

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This LGTM, but the purpose of suppressing these tests is not absolutely clear to me. I suppose they were suppressed in times when bytes and batearray had no the lower() and upper() methods and the __contains__() methods accepted only integers. It will be good if developers which touched this code in past will made a review.

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nosy: +georg.brandl, nnorwitz
stage:  -> patch review

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<http://bugs.python.org/issue19587>
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