Test Hangs Waiting for Join

I have some tests in my django projects that are hanging at both the `self.broker.join('default')` and `self.worker.join()` lines. I know that it hangs at the `self.worker.join()` line because I added a `try/except` block around the `self.broker.join('default', timeout=5000)` with the timeout added. These tests rely on my django views to `send()` to the dramatiq tasks in tasks.py.

I added print statements at the beginning and end of all of my actor tasks and I see them print when the timeout is reached.

I have some other tests that `send()` to the tasks directly and those tests are working perfectly.

I am using the StubBroker in my settings.

If I run the rabbitmq broker with a worker and `manage.py runserver`, I can see all of the tasks are executing successfully.

Do you have any suggestions on how to troubleshoot this?