Originally reported by: BitBucket: offbyone, GitHub: offbyone

I've observed this in the tox test suite, which does a chdir to the tmpdir when running tests using it. Mac OSX symlinks /tmp -> /private/tmp, and defines the system temp dir as /tmp; this cause the realpath and detected path of tmpdir to vary.

• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/110