D1816: tests: make #testcase available as env var in test

[quark (Jun Wu)]

quark added inline comments.

INLINE COMMENTS

> run-tests.py:1338
> +        if self._case:
> +            script.append(b'TESTCASE=%s\n' % self._case)
>  

Maybe `util.shellquote` the name.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D1816

To: martinvonz, #hg-reviewers, quark
Cc: mercurial-devel