heat/HACKING.rst

Heat style commandments

• Step 1: Read the OpenStack style commandments https://docs.openstack.org/hacking/
• Step 2: Read on

Heat specific commandments

None so far

Creating unit tests

For every new feature, unit tests should be created that both test and (implicitly) document the usage of said features. If submitting a patch for a bug that had no unit test, a new passing unit test should be added. If a submitted bug fix does have a unit test, be sure to add a new one that fails without the patch and passes with the patch.

For more information on creating unit tests and utilizing the testing infrastructure in OpenStack Heat, please read heat/tests/testing-overview.txt.

Running tests

The testing system is based on a combination of tox and stestr. The canonical approach to running tests is to simply run the command tox. This will create virtual environments, populate them with dependencies and run all of the tests that OpenStack CI systems run. Behind the scenes, tox is running stestr run, but is set up such that you can supply any additional stestr arguments that are needed to tox. For example, you can run: tox -- --analyze-isolation to cause tox to tell stestr to add --analyze-isolation to its argument list.

It is also possible to run the tests inside of a virtual environment you have created, or it is possible that you have all of the dependencies installed locally already. In this case, you can interact with the stestr command directly. Running stestr run will run the entire test suite in as many threads as you have CPU cores (this is the default incantation tox uses), number of threads can be adjusted with --concurrency N argument. testr run --serial will run tests in serial process. More information about stestr can be found at: http://stestr.readthedocs.io

Note that unit tests use a database if available. See tools/test-setup.sh on how to set up the databases the same way as done in the OpenStack CI systems.

Heat Specific Commandments

• [Heat301] Use LOG.warning() rather than LOG.warn().
• [Heat302] Python 3: do not use dict.iteritems.
• [Heat303] Python 3: do not use dict.iterkeys.
• [Heat304] Python 3: do not use dict.itervalues.