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 [1] 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:

$ 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:

$ tox -e py27

To run the style tests:

$ tox -e pep8

To run multiple tests separate items by commas:

$ tox -e py27,py34,pep8

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:

$ tox -e py27 kolla.tests

To run the tests of a specific file say kolla/tests/test_kolla_docker.py:

$ tox -e py27 test_kolla_docker

To run the tests in the ModuleArgsTest class in the kolla/tests/test_kolla_docker.py file:

$ 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:

$ tox -e py27 test_kolla_docker.ModuleArgsTest.test_module_args

Debugging unit tests

In order to break into the debugger from a unit test we need to insert a breaking point to the code:

import pdb; pdb.set_trace()

Then run tox with the debug environment as one of the following:

tox -e debug
tox -e debug test_file_name.TestClass.test_name

For more information see the oslotest documentation.

Footnotes

[1]	See http://docs.openstack.org/infra/system-config/jenkins.html