[issue13849] Add tests for NUL checking in certain strs

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

If other VMs need this test for some reason, they can easily add a test case themselves. I'm -1 on adding test cases to bug fix releases just for completeness. A lacking test is not a bug, and hence must not be added to a bug fix release.

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<http://bugs.python.org/issue13849>
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