[PATCH 3 of 3 v2 pip-fix] tests: add a test for installing hg with pip in a virtualenv

[Danek Duvall]

Augie Fackler wrote:

> 
> > On Jun 19, 2017, at 18:13, Donald Stufft <donald at stufft.io> wrote:
> > 
> >>> Any thoughts on what to do here?  The ping command has a different
> >>> interface on Solaris than on Linux, so trying to simply ping
> >>> pypi.python.org (assuming we can rely on pip always trying that host) is
> >>> going to run into platform-specific issues.  We could save http_proxy
> >>> aside, and enable it here specifically (somehow).  Or we could allow for
> >>> specific "have"s to be blacklisted, and introduce some sort of
> >>> external-network #if token, maybe?
> >> 
> >> I was going to suggest an hghave check that lets us be sure we can see authentic pypi - dstufft, do you have some endpoint that'd be suitable for such a sniff-test?
> >> 
> >> (The test in question is an end-to-end setup.py install test that makes a virtualenv, which I think is failing because it wants to slurp down pip and setuptools...)
> >> 
> > 
> > 
> > You could just tell virtualenv not to pull down the latest pip/setuptools/etc? That seems like the best solution here since presumably you don’t want your tests hitting the network unless required anyways?
> 
> That sounds like exactly what I want - do you know how to do that? Is
> that the --never-download flag which says it does nothing on my Python
> 2.7.13? (but maybe Danek has an older virtualenv?) 

We have virtualenv 15.0.1, on S12, and 12.0.7 on 11.3.  Python is 2.7.13
and 2.7.9, respectively.

Oddly, --never-download says it's deprecated on 12.0.7, but not on 15.0.1
(where it's also added the --no-download alias).

Danek