166 lines
5.1 KiB
ReStructuredText
166 lines
5.1 KiB
ReStructuredText
Testing Tacker
|
|
==============
|
|
|
|
Overview
|
|
--------
|
|
|
|
The unit tests are meant to cover as much code as possible and should
|
|
be executed without the service running. They are designed to test
|
|
the various pieces of the tacker tree to make sure any new changes
|
|
don't break existing functionality.
|
|
|
|
The functional tests are intended to validate actual system
|
|
interaction. Mocks should be used sparingly, if at all. Care
|
|
should be taken to ensure that existing system resources are not
|
|
modified and that resources created in tests are properly cleaned
|
|
up.
|
|
|
|
Development process
|
|
-------------------
|
|
|
|
It is expected that any new changes that are proposed for merge
|
|
come with tests for that feature or code area. Ideally any bugs
|
|
fixes that are submitted also have tests to prove that they stay
|
|
fixed! In addition, before proposing for merge, all of the
|
|
current tests should be passing.
|
|
|
|
Running unit tests
|
|
------------------
|
|
|
|
There are three mechanisms for running tests: run_tests.sh, tox,
|
|
and nose. Before submitting a patch for review you should always
|
|
ensure all test pass; a tox run is triggered by the jenkins gate
|
|
executed on gerrit for each patch pushed for review.
|
|
|
|
With these mechanisms you can either run the tests in the standard
|
|
environment or create a virtual environment to run them in.
|
|
|
|
By default after running all of the tests, any pep8 errors
|
|
found in the tree will be reported.
|
|
|
|
|
|
With `run_tests.sh`
|
|
~~~~~~~~~~~~~~~~~~~
|
|
|
|
You can use the `run_tests.sh` script in the root source directory to execute
|
|
tests in a virtualenv::
|
|
|
|
./run_tests -V
|
|
|
|
|
|
With `nose`
|
|
~~~~~~~~~~~
|
|
|
|
You can use `nose`_ to run individual tests, as well as use for debugging
|
|
portions of your code::
|
|
|
|
source .venv/bin/activate
|
|
pip install nose
|
|
nosetests
|
|
|
|
There are disadvantages to running Nose - the tests are run sequentially, so
|
|
race condition bugs will not be triggered, and the full test suite will
|
|
take significantly longer than tox & testr. The upside is that testr has
|
|
some rough edges when it comes to diagnosing errors and failures, and there is
|
|
no easy way to set a breakpoint in the Tacker code, and enter an
|
|
interactive debugging session while using testr.
|
|
|
|
.. _nose: https://nose.readthedocs.org/en/latest/index.html
|
|
|
|
With `tox`
|
|
~~~~~~~~~~
|
|
|
|
Tacker, like other OpenStack projects, uses `tox`_ for managing the virtual
|
|
environments for running test cases. It uses `Testr`_ for managing the running
|
|
of the test cases.
|
|
|
|
Tox handles the creation of a series of `virtualenvs`_ that target specific
|
|
versions of Python (2.6, 2.7, 3.3, etc).
|
|
|
|
Testr handles the parallel execution of series of test cases as well as
|
|
the tracking of long-running tests and other things.
|
|
|
|
Running unit tests is as easy as executing this in the root directory of the
|
|
Tacker source code::
|
|
|
|
tox
|
|
|
|
For more information on the standard Tox-based test infrastructure used by
|
|
OpenStack and how to do some common test/debugging procedures with Testr,
|
|
see this wiki page:
|
|
|
|
https://wiki.openstack.org/wiki/Testr
|
|
|
|
.. _Testr: https://wiki.openstack.org/wiki/Testr
|
|
.. _tox: http://tox.readthedocs.org/en/latest/
|
|
.. _virtualenvs: https://pypi.python.org/pypi/virtualenv
|
|
|
|
|
|
Running individual tests
|
|
~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
For running individual test modules or cases, you just need to pass
|
|
the dot-separated path to the module you want as an argument to it.
|
|
|
|
For executing a specific test case, specify the name of the test case
|
|
class separating it from the module path with a colon.
|
|
|
|
For example, the following would run only the TestVNFMPlugin tests from
|
|
tacker/tests/unit/vm/test_plugin.py::
|
|
|
|
$ ./run_tests.sh tacker.tests.unit.vm.test_plugin:TestVNFMPlugin
|
|
|
|
or::
|
|
|
|
$ ./tox tacker.tests.unit.vm.test_plugin:TestVNFMPlugin
|
|
|
|
Adding more tests
|
|
~~~~~~~~~~~~~~~~~
|
|
|
|
Tacker has a fast growing code base and there is plenty of areas that
|
|
need to be covered by unit and functional tests.
|
|
|
|
To get a grasp of the areas where tests are needed, you can check
|
|
current coverage by running::
|
|
|
|
$ ./run_tests.sh -c
|
|
|
|
Debugging
|
|
---------
|
|
|
|
By default, calls to pdb.set_trace() will be ignored when tests
|
|
are run. For pdb statements to work, invoke run_tests as follows::
|
|
|
|
$ ./run_tests.sh -d [test module path]
|
|
|
|
It's possible to debug tests in a tox environment::
|
|
|
|
$ tox -e venv -- python -m testtools.run [test module path]
|
|
|
|
Tox-created virtual environments (venv's) can also be activated
|
|
after a tox run and reused for debugging::
|
|
|
|
$ tox -e venv
|
|
$ . .tox/venv/bin/activate
|
|
$ python -m testtools.run [test module path]
|
|
|
|
Tox packages and installs the tacker source tree in a given venv
|
|
on every invocation, but if modifications need to be made between
|
|
invocation (e.g. adding more pdb statements), it is recommended
|
|
that the source tree be installed in the venv in editable mode::
|
|
|
|
# run this only after activating the venv
|
|
$ pip install --editable .
|
|
|
|
Editable mode ensures that changes made to the source tree are
|
|
automatically reflected in the venv, and that such changes are not
|
|
overwritten during the next tox run.
|
|
|
|
Post-mortem debugging
|
|
~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
Setting OS_POST_MORTEM_DEBUG=1 in the shell environment will ensure
|
|
that pdb.post_mortem() will be invoked on test failure::
|
|
|
|
$ OS_POST_MORTEM_DEBUG=1 ./run_tests.sh -d [test module path]
|