## Description
Fixes#591.
## Rationale
We are currently not testing many combinations, we run Flake8 on the generated project with default options, but that rarely catch any issues.
## Use case(s) / visualization(s)
Catch problems with invalid combinations, for instance, it fails due to Whitenoise breaking flake8 with `django-compressor` because `STATIC_URL` was undefined here:
b91c70d755/%7B%7Bcookiecutter.project_slug%7D%7D/config/settings/production.py (L185)
* Add failing test for travis.yml
I see three options to test travis.yml :
1. Testing that the YAML contains relevant value. Least useful and least
reliable, but simplest to implement.
2. Testing that the YAML is valid TravisCI YAML. Unfortunately this is
difficult / impossible. Doing 'travis lint' would succeed, this command
does not check for 'script' key presence and wouldn't be useful for us.
We could use 'travis-build' to verify that the YAML can be converted to
a worker config, but as of now 'travis-build' doesn't work out of the
box.
There is a new tool for validating travis YAML files 'travis-yml', but
as of now it's a ruby-only library and it's still a work in progress.
3. Running Travis CI task based on the generated YAML. This seems the
best approach, however since cookiecutter-django itself uses Travis CI,
that would require running Travis CI from within Travis CI.
Scheduling Travis CI job without a github push still requires a public
github repo, which is something that we can't generate on demand.
Given that I'm opting to use approach 1.
* Adds missing config to generated .travis.yml
The keys added are as follows:
1. 'script'
Required by Travis, cookiecutter-django used to provide it until it has
been removed together with hitch.
I'm assuming hitch has been replaced with pytest, I'm setting pytest as
the new value for the 'script' key.
2. 'install'
Not required by Travis, but necessary in our case; installs test
libraries, mostly pytest.
As of now this points to 'local.txt' requirements file. There used to be
a separate 'test.txt' requirements file but it has been decided to merge
it with 'local.txt', see discussion in
https://github.com/pydanny/cookiecutter-django/pull/1557 .
* Update CONTRIBUTORS.rst
This PR updates [tox](https://pypi.org/project/tox) from **3.0.0** to **3.1.1**.
<details>
<summary>Changelog</summary>
### 3.1.0
```
------------------
Bugfixes
^^^^^^^^
- Add ``ignore_basepython_conflict``, which determines whether conflicting
``basepython`` settings for environments containing default factors, such as
``py27`` or ``django18-py35``, should be ignored or result in warnings. This
was a common source of misconfiguration and is rarely, if ever, desirable from
a user perspective - by :user:`stephenfin` (`477 <https://github.com/tox-dev/tox/issues/477>`_)
- Fix bug with incorrectly defactorized dependencies (deps passed to pip were not de-factorized) - by :user:`bartsanchez` (`706 <https://github.com/tox-dev/tox/issues/706>`_)
Features
^^^^^^^^
- Add support for multiple PyPy versions using default factors. This allows you
to use, for example, ``pypy27`` knowing that the correct intepreter will be
used by default - by :user:`stephenfin` (`19 <https://github.com/tox-dev/tox/issues/19>`_)
- Add support to explicitly invoke interpreter directives for environments with
long path lengths. In the event that ``tox`` cannot invoke scripts with a
system-limited shebang (e.x. a Linux host running a Jenkins Pipeline), a user
can set the environment variable ``TOX_LIMITED_SHEBANG`` to workaround the
system's limitation (e.x. ``export TOX_LIMITED_SHEBANG=1``) - by :user:`jdknight` (`794 <https://github.com/tox-dev/tox/issues/794>`_)
- introduce a constants module to be used internally and as experimental API - by :user:`obestwalter` (`798 <https://github.com/tox-dev/tox/issues/798>`_)
- Make ``py2`` and ``py3`` aliases also resolve via ``py`` on windows by :user:`asottile`. This enables the following things:
``tox -e py2`` and ``tox -e py3`` work on windows (they already work on posix); and setting ``basepython=python2`` or ``basepython=python3`` now works on windows. (`856 <https://github.com/tox-dev/tox/issues/856>`_)
- Replace the internal version parsing logic from the not well tested `PEP-386 <https://www.python.org/dev/peps/pep-0386/>`_ parser for the more general `PEP-440 <https://www.python.org/dev/peps/pep-0440/>`_. `packaging >= 17.1 <https://pypi.org/project/packaging/>`_ is now an install dependency by :user:`gaborbernat`. (`860 <https://github.com/tox-dev/tox/issues/860>`_)
Documentation
^^^^^^^^^^^^^
- extend the plugin documentation and make lot of small fixes and improvements - by :user:`obestwalter` (`797 <https://github.com/tox-dev/tox/issues/797>`_)
- tidy up tests - remove unused fixtures, update old cinstructs, etc. - by :user:`obestwalter` (`799 <https://github.com/tox-dev/tox/issues/799>`_)
- Various improvements to documentation: open browser once documentation generation is done, show Github/Travis info on documentation page, remove duplicate header for changelog, generate unreleased news as DRAFT on top of changelog, make the changelog page more compact and readable (width up to 1280px) by :user:`gaborbernat` (`859 <https://github.com/tox-dev/tox/issues/859>`_)
Miscellaneous
^^^^^^^^^^^^^
- filter out unwanted files in package - by :user:`obestwalter` (`754 <https://github.com/tox-dev/tox/issues/754>`_)
- make the already existing implicit API explicit - by :user:`obestwalter` (`800 <https://github.com/tox-dev/tox/issues/800>`_)
- improve tox quickstart and corresponding tests - by :user:`obestwalter` (`801 <https://github.com/tox-dev/tox/issues/801>`_)
- tweak codecov settings via .codecov.yml - by :user:`obestwalter` (`802 <https://github.com/tox-dev/tox/issues/802>`_)
```
</details>
<details>
<summary>Links</summary>
- PyPI: https://pypi.org/project/tox
- Changelog: https://pyup.io/changelogs/tox/
- Docs: https://tox.readthedocs.org/
</details>
* Prettify and re-order settings entries
* Use old-style .format() for the time being
* Remove redundant linebreaks at the settings files' beginning
* Fix E303 too many blank lines
* Remove a redundant linebreak from requirements.txt
* Some linebreake juggling in config.settings.base
