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    .. _running-tests:
    
    =============
    Running tests
    =============
    
    Kolla contains a suite of tests in the
    ``tests`` and ``kolla/tests`` directories.
    
    Any proposed code change in gerrit is automatically rejected by the OpenStack
    Jenkins server [#f1]_ if the change causes test failures.
    
    It is recommended for developers to run the test suite before submitting patch
    for review. This allows to catch errors as early as possible.
    
    Preferred way to run the tests
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
    The preferred way to run the unit tests is using ``tox``. It executes tests in
    isolated environment, by creating separate virtualenv and installing
    dependencies from the ``requirements.txt`` and ``test-requirements.txt`` files,
    so the only package you install is ``tox`` itself:
    
    .. code-block:: console
    
        $ pip install tox
    
    See `the unit testing section of the Testing wiki page`_ for more information.
    Following are some simple examples.
    
    To run the Python 2.7 tests:
    
    .. code-block:: console
    
        $ tox -e py27
    
    To run the style tests:
    
    .. code-block:: console
    
        $ tox -e pep8
    
    To run multiple tests separate items by commas:
    
    .. code-block:: console
    
        $ tox -e py27,py34,pep8
    
    .. _the unit testing section of the Testing wiki page: https://wiki.openstack.org/wiki/Testing#Unit_Tests
    
    Running a subset of tests
    -------------------------
    
    Instead of running all tests, you can specify an individual directory, file,
    class or method that contains test code, i.e. filter full names of tests by a
    string.
    
    To run the tests located only in the ``kolla/tests``
    directory use:
    
    .. code-block:: console
    
        $ tox -e py27 kolla.tests
    
    To run the tests of a specific file say ``kolla/tests/test_kolla_docker.py``:
    
    .. code-block:: console
    
        $ tox -e py27 test_kolla_docker
    
    To run the tests in the ``ModuleArgsTest`` class in
    the ``kolla/tests/test_kolla_docker.py`` file:
    
    .. code-block:: console
    
        $ tox -e py27 test_kolla_docker.ModuleArgsTest
    
    To run the ``ModuleArgsTest.test_module_args`` test method in
    the ``kolla/tests/test_kolla_docker.py``` file:
    
    .. code-block:: console
    
        $ tox -e py27 test_kolla_docker.ModuleArgsTest.test_module_args
    
    
    .. rubric:: Footnotes
    
    .. [#f1] See http://docs.openstack.org/infra/system-config/jenkins.html