[TIP] tox-2.0.0: plugin support, platforms, env isolation

[Alex Gaynor]

Hi Holger,

First: congrats on shipping 2.0, I'm very excited to explore some of the
new features.

Second:

Did tox drop Python 2.6 support? It started failing on our CI, so far the
error I see is that tox imports argparse, but I guess it's setup.py does
not depend on it. Can this be fixed?

Thanks!
Alex

On Tue, May 12, 2015 at 5:46 PM, holger krekel <holger at merlinux.eu> wrote:

> tox-2.0: plugins, platform, env isolation
> ==========================================
>
> tox-2.0 was released to pypi, a major new release with *mostly*
> backward-compatible enhancements and fixes:
>
> - experimental support for plugins, see
> https://testrun.org/tox/dev/plugins.html
>   which includes also a refined internal registration mechanism for new
> testenv
>   ini options.  You can now ask tox which testenv ini parameters exist
>   with ``tox --help-ini``.
>
> - ENV isolation: only pass through very few environment variables from the
>   tox invocation to the test environments.  This may break test runs that
>   previously worked with tox-1.9 -- you need to either use the
>   ``setenv`` or ``passenv`` ini variables to set appropriate environment
>   variables.
>
> - PLATFORM support: you can set ``platform=REGEX`` in your testenv sections
>   which lets tox skip the environment if the REGEX does not match
> ``sys.platform``.
>
> - tox now stops execution of test commands if the first of them fails
> unless
>   you set ``ignore_errors=True``.
>
> Thanks to Volodymyr Vitvitski, Daniel Hahler, Marc Abramowitz, Anthon van
> der Neuth and others for contributions.
>
> More documentation about tox in general:
>
>     http://tox.testrun.org/
>
> Installation:
>
>     pip install -U tox
>
> code hosting and issue tracking on bitbucket:
>
>     https://bitbucket.org/hpk42/tox
>
> What is tox?
> ----------------
>
> tox standardizes and automates tedious test activities driven from a
> simple ``tox.ini`` file, including:
>
> * creation and management of different virtualenv environments
>   with different Python interpreters
> * packaging and installing your package into each of them
> * running your test tool of choice, be it nose, py.test or unittest2 or
> other tools such as "sphinx" doc checks
> * testing dev packages against each other without needing to upload to PyPI
>
> best,
> Holger Krekel, merlinux GmbH
>
> --
> about me:    http://holgerkrekel.net/about-me/
> contracting: http://merlinux.eu
>
> 2.0.0
> -----------
>
> - (new) introduce environment variable isolation:
>   tox now only passes the PATH and PIP_INDEX_URL variable from the tox
>   invocation environment to the test environment and on Windows
>   also ``SYSTEMROOT``, ``PATHEXT``, ``TEMP`` and ``TMP`` whereas
>   on unix additionally ``TMPDIR`` is passed.  If you need to pass
>   through further environment variables you can use the new ``passenv``
> setting,
>   a space-separated list of environment variable names.  Each name
>   can make use of fnmatch-style glob patterns.  All environment
>   variables which exist in the tox-invocation environment will be copied
>   to the test environment.
>
> - a new ``--help-ini`` option shows all possible testenv settings and
>   their defaults.
>
> - (new) introduce a way to specify on which platform a testenvironment is
> to
>   execute: the new per-venv "platform" setting allows to specify
>   a regular expression which is matched against sys.platform.
>   If platform is set and doesn't match the platform spec in the test
>   environment the test environment is ignored, no setup or tests are
> attempted.
>
> - (new) add per-venv "ignore_errors" setting, which defaults to False.
>    If ``True``, a non-zero exit code from one command will be ignored and
>    further commands will be executed (which was the default behavior in
> tox <
>    2.0).  If ``False`` (the default), then a non-zero exit code from one
> command
>    will abort execution of commands for that environment.
>
> - show and store in json the version dependency information for each venv
>
> - remove the long-deprecated "distribute" option as it has no effect these
> days.
>
> - fix issue233: avoid hanging with tox-setuptools integration example.
> Thanks simonb.
>
> - fix issue120: allow substitution for the commands section.  Thanks
>   Volodymyr Vitvitski.
>
> - fix issue235: fix AttributeError with --installpkg.  Thanks
>   Volodymyr Vitvitski.
>
> - tox has now somewhat pep8 clean code, thanks to Volodymyr Vitvitski.
>
> - fix issue240: allow to specify empty argument list without it being
>   rewritten to ".".  Thanks Daniel Hahler.
>
> - introduce experimental (not much documented yet) plugin system
>   based on pytest's externalized "pluggy" system.
>   See tox/hookspecs.py for the current hooks.
>
> - introduce parser.add_testenv_attribute() to register an ini-variable
>   for testenv sections.  Can be used from plugins through the
>   tox_add_option hook.
>
> - rename internal files -- tox offers no external API except for the
>   experimental plugin hooks, use tox internals at your own risk.
>
> - DEPRECATE distshare in documentation
>
>
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