5f72723b41
lock file. Addresses documentation need raised in bug 897155 Change-Id: Idc95c12f939948bbbefd84a79b3785e3c2fd752c
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5.5 KiB
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160 lines
5.5 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 `nose`_ testrunner and the `pep8`_ checker.
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.. _nose: http://code.google.com/p/python-nose/
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.. _pep8: https://github.com/jcrocholl/pep8
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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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-r, --recreate-db Recreate the test database (deprecated, as this is now the default).
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-n, --no-recreate-db Don't recreate the test database.
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-x, --stop Stop running tests after the first error or failure.
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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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-p, --pep8 Just run pep8
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-P, --no-pep8 Don't run pep8
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-c, --coverage Generate coverage report
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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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Because ``run_tests.sh`` is a wrapper around nose, it also accepts the same
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flags as nosetests. See the `nose options documentation`_ for details about
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these additional flags.
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.. _nose options documentation: http://readthedocs.org/docs/nose/en/latest/usage.html#options
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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/test_libvirt.py`` file::
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./run_tests.sh test_libvirt
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To run the tests in the `HostStateTestCase` class in
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``nova/tests/test_libvirt.py``::
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./run_tests.sh test_libvirt:HostStateTestCase
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To run the `ToPrimitiveTestCase.test_dict` test method in
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``nova/tests/test_utils.py``::
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./run_tests.sh test_utils:ToPrimitiveTestCase.test_dict
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Suppressing logging output when tests fail
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------------------------------------------
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By default, when one or more unit test fails, all of the data sent to the
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logger during the failed tests will appear on standard output, which typically
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consists of many lines of texts. The logging output can make it difficult to
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identify which specific tests have failed, unless your terminal has a large
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scrollback buffer or you have redirected output to a file.
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You can suppress the logging output by calling ``run_tests.sh`` with the nose
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flag::
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--nologcapture
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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 ``tools/pip-requires`` 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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Database
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--------
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Some of the unit tests make queries against an sqlite database [#f3]_. By
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default, the test database (``tests.sqlite``) is deleted and recreated each
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time ``run_tests.sh`` is invoked (This is equivalent to using the
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``-r, --recreate-db`` flag). To reduce testing time if a database already
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exists it can be reused by using the flag::
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-n, --no-recreate-db
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Reusing an existing database may cause tests to fail if the schema has
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changed. If any files in the ``nova/db/sqlalchemy`` have changed, it's a good
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idea to recreate the test database.
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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/fake_flags.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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