Quickly Running A Single OpenStack Nova Test

Here’s how we usually run a single test

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dims@dims-mac:~/openstack/nova$ time tox -e py27 nova.tests.unit.test_versions py27 develop-inst-noop: /Users/dims/openstack/nova py27 runtests: PYTHONHASHSEED='0' py27 runtests: commands[0] | find . -type f -name *.pyc -delete py27 runtests: commands[1] | bash tools/pretty_tox.sh nova.tests.unit.test_versions {1} nova.tests.unit.test_versions.VersionTestCase.test_version_string_with_package_is_good [0.180036s] ... ok {0} nova.tests.unit.test_versions.VersionTestCase.test_release_file [0.184115s] ... ok   ====== Totals ====== Ran: 2 tests in 13.0000 sec.  - Passed: 2  - Skipped: 0  - Failed: 0 Sum of execute time for each test: 0.3642 sec.   ============== Worker Balance ==============  - Worker 0 (1 tests) => 0:00:00.184115s  - Worker 1 (1 tests) => 0:00:00.180036s ________________________________________________________________________________________________________________________ summary _________________________________________________________________________________________________________________________   py27: commands succeeded   congratulations <span class="wp-smiley wp-emoji wp-emoji-smile" title=":)">:)</span>   real    0m14.452s user    0m16.392s sys 0m2.354s

Sometimes the usual way is not very helpful, especially when you are working on some new code and say running into issues importing code. Then, here’s what you do.

First, activate the py27 virtualenv

1	dims@dims-mac:~/openstack/nova$ . .tox/py27/bin/activate

Then use testtools

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(py27)dims@dims-mac:~/openstack/nova$ python -m testtools.run nova.tests.unit.test_versions Tests running...   Ran 2 tests in 0.090s OK

Or you can install pytest

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(py27)dims@dims-mac:~/openstack/nova$ pip install pytest Collecting pytest   Downloading pytest-2.6.4.tar.gz (512kB)     100% |################################| 516kB 877kB/s Collecting py>=1.4.25 (from pytest)   Downloading py-1.4.26.tar.gz (190kB)     100% |################################| 192kB 4.3MB/s Installing collected packages: py, pytest   Running setup.py install for py   Running setup.py install for pytest     Installing py.test-2.7 script to /Users/dims/openstack/nova/.tox/py27/bin     Installing py.test script to /Users/dims/openstack/nova/.tox/py27/bin Successfully installed py-1.4.26 pytest-2.6.4

And then run the same test using py.test

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(py27)dims@dims-mac:~/openstack/nova$ find . -name py.test ./.tox/py27/bin/py.test   (py27)dims@dims-mac:~/openstack/nova$ .tox/py27/bin/py.test -svx nova/tests/unit/test_versions.py ================================================================================================================== test session starts =================================================================================================================== platform darwin -- Python 2.7.8 -- py-1.4.26 -- pytest-2.6.4 -- /Users/dims/openstack/nova/.tox/py27/bin/python2.7 collected 2 items   nova/tests/unit/test_versions.py::VersionTestCase::test_release_file PASSED nova/tests/unit/test_versions.py::VersionTestCase::test_version_string_with_package_is_good PASSED   ================================================================================================================ 2 passed in 1.69 seconds ================================================================================================================

These tips are based on the openstack-dev mailing list discussion:
http://openstack.markmail.org/thread/wetxcnhuq6b7auhn