[issue13849] Add tests for NUL checking in certain strs

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9e997c8f4876 by Berker Peksag in branch '3.5':
Issue #13849: Fix test_null_bytes under Windows
https://hg.python.org/cpython/rev/9e997c8f4876

New changeset a28abe83cf5c by Berker Peksag in branch 'default':
Issue #13849: Merge from 3.5
https://hg.python.org/cpython/rev/a28abe83cf5c

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