[tor-bugs] #26916 [Core Tor/Stem]: Make tox config more useful/friendly for running multiple interpreters/versions

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#26916: Make tox config more useful/friendly for running multiple
interpreters/versions
---------------------------+------------------------------
 Reporter:  dmr            |          Owner:  dmr
     Type:  enhancement    |         Status:  needs_review
 Priority:  Medium         |      Milestone:
Component:  Core Tor/Stem  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:  dev testing    |  Actual Points:
Parent ID:                 |         Points:
 Reviewer:  atagar         |        Sponsor:
---------------------------+------------------------------
Changes (by dmr):

 * status:  assigned => needs_review
 * reviewer:   => atagar


Comment:

 Pull request:
 https://github.com/torproject/stem/pull/7
 branch head `e82b3f4317e544e9fce61fc8d93b4cbb72263fd3`

 Handy 'lil `--no-ff` merge commit there to sum things up, too.

 For reference, these changes were done for `tox --version` 2.5.0, on
 Debian stretch.

 There may be some `tox` version dependencies to look out for here. I'd
 really appreciate a sanity check on another system :).

 I'd especially like you to check whether the `pypy` environment works for
 you (see `a3414913275192163ae186d86c7bcaff5e7be5e9`). I saw that stem is
 now aiming for `pypy` compatibility, and I'm really hoping this PR helps
 simplify testing across versions in the future!

 For instance, I think this will be one of the most common commands I run
 while developing:
 {{{
 tox -- -u -q
 }}}
 `time` for that clocks in around 20s for me on py27,py35

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26916#comment:1>
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