On various test infrastructures (Travis-CI in particular) PyPI is frequently unavailable.
When this is so, I would like tox to re-try the
pip install step but not the actual testing step. If actual tests fail, I would like to see a failure. If installation fails, I would like to just re-attempt installation… for intermittent failures, I'd like to do this basically forever, for "hard" failures where packages appear to have been removed from the index, for example, reporting a failure might be fine.
There doesn't seem to be a way to do this, and I can't work around it because there also doesn't seem to be a way to tell tox to just create its virtual environments. Perhaps I just haven't found the relevant documentation yet though.