Comment 12 for bug 1204456

Works without the -N option:
$ ./run_tests.sh neutron.tests.unit.ml2.test_agent_scheduler

Also works with tox (version 1.6.1):
$ tox -e py27 -- neutron.tests.unit.ml2.test_agent_scheduler

The above two methods use a virtualenv to run the tests in. The -N option to run_tests.sh tells it to not use a virtualenv and run the unit tests in the system environment. If the system environment does not satisfy the test-requirements correctly or has some settings that interfere, then the tests may not work.

The recommended way of running unit tests is in a virtualenv. If someone wants to run tests in their system environment it is up to them to adjust their environment appropriately.