"all of the Windmill tests are run as a single Django test instance, meaning that they share the same test database and can potentially clobber one another's data. This is understandable, since the Windmill startup process is quite time-consuming, but it is contrary to the ideals of unit testing; each test is supposed to run in a completely independent environment. I worked around this using the following code instead of the example from the Windmill wiki:" - Tom