[issue29514] Add a test case that prevents magic number changes in minor releases

[Nick Coghlan]

Nick Coghlan added the comment:

Regarding the naming of the test file: I agree this can just be added to Lib/test/test_importlib/test_util:MagicNumberTests rather than being added as a new test file.

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<http://bugs.python.org/issue29514>
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