Fixed not being able to run tests on Windows #1153
Merged
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On windows, pip needs the PYTHON_EGG_CACHE and windir environment variables to be able to install packages correctly. Therefore tox needs to pass these variables down to pip when tox installs packages locally.
PYTHON_EGG_CACHE is set to reside in the virtualenv directory so that it does not pollute a users global egg cache directory. Plus it may not be set by a user, even though I found it to be required for pip to run in virtualenv with tox.