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Pants

This hangs:
```./pants test ./test_queue.py```
This passes:
```./pants test --debug ./test_queue.py```

`--debug` runs the process interactively, such that it will actually be able to read `stdio`, and will have a `TTY`

if the test is attempting to interact with the terminal, that might cause it to hang when run in the background.

to confirm, i’d recommend attaching to the test process with <https://github.com/benfred/py-spy|py-spy>, with something like:
```sudo py-spy dump -p $testpid```

Forgot to mention there’s also multiprocessing involved

i don’t think that that could cause this, but perhaps? as mentioned: highly recommend `py-spy`, as it will tell you where it is hung.