ccc71aeb63
unit_tests.rst is outdated and does not reflect the recent changes in the run_tests.sh script. Fix required an update of the usage output of run_tests.sh as well as changes to some references. Nova now uses testrepository and flake8. There were also changes to the examples shown in the section "Running a subset of tests". All the updated examples were tested. Removes white spaces at the of end 3 lines. Change-Id: I3fa040d5682ad94d861cef2a64b19b4da947318b Closes-Bug: #1219040
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139 lines
5.1 KiB
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Unit Tests
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==========
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Nova contains a suite of unit tests, in the nova/tests directory.
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Any proposed code change will be automatically rejected by the OpenStack
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Jenkins server [#f1]_ if the change causes unit test failures.
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Running the tests
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-----------------
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Run the unit tests by doing::
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./run_tests.sh
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This script is a wrapper around the `testr`_ testrunner and the `flake8`_ checker.
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.. _testr: https://code.launchpad.net/testrepository
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.. _flake8: https://github.com/bmcustodio/flake8
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Flags
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-----
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The ``run_tests.sh`` script supports several flags. You can view a list of
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flags by doing::
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run_tests.sh -h
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This will show the following help information::
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Usage: ./run_tests.sh [OPTION]...
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Run Nova's test suite(s)
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-V, --virtual-env Always use virtualenv. Install automatically if not present
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-N, --no-virtual-env Don't use virtualenv. Run tests in local environment
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-s, --no-site-packages Isolate the virtualenv from the global Python environment
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-f, --force Force a clean re-build of the virtual environment. Useful when dependencies have been added.
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-u, --update Update the virtual environment with any newer package versions
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-p, --pep8 Just run PEP8 and HACKING compliance check
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-P, --no-pep8 Don't run static code checks
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-c, --coverage Generate coverage report
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-d, --debug Run tests with testtools instead of testr. This allows you to use the debugger.
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-h, --help Print this usage message
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--hide-elapsed Don't print the elapsed time for each test along with slow test list
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--virtual-env-path <path> Location of the virtualenv directory
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Default: $(pwd)
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--virtual-env-name <name> Name of the virtualenv directory
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Default: .venv
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--tools-path <dir> Location of the tools directory
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Default: $(pwd)
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Note: with no options specified, the script will try to run the tests in a virtual environment,
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If no virtualenv is found, the script will ask if you would like to create one. If you
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prefer to run tests NOT in a virtual environment, simply pass the -N option.
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Because ``run_tests.sh`` is a wrapper around testrepository, it also accepts the same
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flags as testr. See the `testr user manual`_ for details about
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these additional flags.
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.. _testr user manual: https://testrepository.readthedocs.org/en/latest/MANUAL.html
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Running a subset of tests
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-------------------------
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Instead of running all tests, you can specify an individual directory, file,
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class, or method that contains test code.
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To run the tests in the ``nova/tests/scheduler`` directory::
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./run_tests.sh scheduler
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To run the tests in the ``nova/tests/virt/libvirt/test_libvirt.py`` file::
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./run_tests.sh test_libvirt
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To run the tests in the ``CacheConcurrencyTestCase`` class in
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``nova/tests/virt/libvirt/test_libvirt.py``::
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./run_tests.sh test_libvirt.CacheConcurrencyTestCase
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To run the `ValidateIntegerTestCase.test_invalid_inputs` test method in
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``nova/tests/test_utils.py``::
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./run_tests.sh test_utils.ValidateIntegerTestCase.test_invalid_inputs
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Virtualenv
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----------
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By default, the tests use the Python packages installed inside a
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virtualenv [#f2]_. (This is equivalent to using the ``-V, --virtualenv`` flag).
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If the virtualenv does not exist, it will be created the first time the tests are run.
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If you wish to recreate the virtualenv, call ``run_tests.sh`` with the flag::
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-f, --force
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Recreating the virtualenv is useful if the package dependencies have changed
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since the virtualenv was last created. If the ``requirements.txt`` or
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``tools/install_venv.py`` files have changed, it's a good idea to recreate the
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virtualenv.
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By default, the unit tests will see both the packages in the virtualenv and
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the packages that have been installed in the Python global environment. In
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some cases, the packages in the Python global environment may cause a conflict
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with the packages in the virtualenv. If this occurs, you can isolate the
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virtualenv from the global environment by using the flag::
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-s, --no-site packages
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If you do not wish to use a virtualenv at all, use the flag::
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-N, --no-virtual-env
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Gotchas
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-------
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**Running Tests from Shared Folders**
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If you are running the unit tests from a shared folder, you may see tests start
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to fail or stop completely as a result of Python lockfile issues [#f4]_. You
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can get around this by manually setting or updating the following line in
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``nova/tests/conf_fixture.py``::
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FLAGS['lock_path'].SetDefault('/tmp')
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Note that you may use any location (not just ``/tmp``!) as long as it is not
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a shared folder.
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.. rubric:: Footnotes
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.. [#f1] See :doc:`jenkins`.
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.. [#f2] See :doc:`development.environment` for more details about the use of
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virtualenv.
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.. [#f3] There is an effort underway to use a fake DB implementation for the
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unit tests. See https://lists.launchpad.net/openstack/msg05604.html
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.. [#f4] See Vish's comment in this bug report: https://bugs.launchpad.net/nova/+bug/882933
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