105 lines
3.6 KiB
ReStructuredText
105 lines
3.6 KiB
ReStructuredText
Testing Tacker
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==============
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Overview
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--------
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The unit tests are meant to cover as much code as possible and should
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be executed without the service running. They are designed to test
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the various pieces of the tacker tree to make sure any new changes
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don't break existing functionality.
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The functional tests are intended to validate actual system
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interaction. Mocks should be used sparingly, if at all. Care
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should be taken to ensure that existing system resources are not
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modified and that resources created in tests are properly cleaned
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up.
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Development process
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-------------------
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It is expected that any new changes that are proposed for merge
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come with tests for that feature or code area. Ideally any bugs
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fixes that are submitted also have tests to prove that they stay
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fixed! In addition, before proposing for merge, all of the
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current tests should be passing.
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Running unit tests with tox
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---------------------------
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Before submitting a patch for review you should always ensure all
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test pass; a tox run is triggered by the Zuul gate executed on
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gerrit for each patch pushed for review.
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With this mechanism you can either run the tests in the standard
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environment or create a virtual environment to run them in.
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By default after running all of the tests, any pep8 errors
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found in the tree will be reported.
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Note that the tests can use a database, see ``tools/tests-setup.sh``
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on how the databases are set up in the OpenStack CI environment.
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Tacker, like other OpenStack projects, uses `tox`_ for managing the virtual
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environments for running test cases. It uses `stestr`_ for managing the running
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of the test cases.
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Tox handles the creation of a series of `virtualenvs`_ that target specific
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versions of Python (2.7, 3.5, etc). stestr handles the parallel execution
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of series of test cases as well as the tracking of long-running tests and
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other things.
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Running unit tests is as easy as executing this in the root directory of the
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Tacker source code::
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tox
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For more information on the standard Tox-based test infrastructure used by
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OpenStack and how to do some common test/debugging procedures with stestr,
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see at: https://governance.openstack.org/tc/reference/pti/python.html
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.. _stestr: https://stestr.readthedocs.io/en/latest/
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.. _tox: https://tox.readthedocs.io/en/latest/
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.. _virtualenvs: https://pypi.org/project/virtualenv/
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Running individual tests
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~~~~~~~~~~~~~~~~~~~~~~~~
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For running individual test modules or cases, you just need to pass
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the dot-separated path to the module you want as an argument to it.
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For executing a specific test case, specify the name of the test case
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class separating it from the module path with a colon.
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For example, the following would run only the TestVNFMPlugin tests from
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tacker/tests/unit/vm/test_plugin.py::
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$ ./tox tacker.tests.unit.vm.test_plugin:TestVNFMPlugin
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Debugging
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---------
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It's possible to debug tests in a tox environment::
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$ tox -e venv -- python -m testtools.run [test module path]
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Tox-created virtual environments (venv's) can also be activated
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after a tox run and reused for debugging::
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$ tox -e venv
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$ . .tox/venv/bin/activate
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$ python -m testtools.run [test module path]
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Tox packages and installs the tacker source tree in a given venv
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on every invocation, but if modifications need to be made between
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invocation (e.g. adding more pdb statements), it is recommended
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that the source tree be installed in the venv in editable mode::
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# run this only after activating the venv
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$ pip install --editable .
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Editable mode ensures that changes made to the source tree are
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automatically reflected in the venv, and that such changes are not
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overwritten during the next tox run.
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