D3721: run-tests: restrict the test cases allowed characters

[mharbison72 (Matt Harbison)]

mharbison72 accepted this revision.
mharbison72 added a comment.


  The second hunk in run-test.py doesn't apply for me (it looks like adding `b` to a string has landed, but wasn't applied near the first hunk).  But manually applying it, Windows is happy again.  Thanks.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3721

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