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tox should try to reinstall dependencies if they failed the last time #6
This was mentioned on the mailing list (see http://lists.idyll.org/pipermail/testing-in-python/2011-June/004173.html).
Here is an example tox session
Notice how even though installing the dependency fails, it runs without any problems the second time around. This happens when there is any kind of error installing a dependency, not just downloading.