Feature/unit test cleanup threads #300
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And ensure that `InstanceManager.shutdown()` is only called once by `Manager`.
… unit tests Ensure all threads are properly shutting down in the unit tests. This prevents the following warning: ``` DeprecationWarning: This process (pid=208847) is multi-threaded, use of fork() may lead to deadlocks in the child. ```
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This PR adds a fixture to check that no threads are left running after every test.
It also fixes every case where threads were left running, and thereby prevents the following
DeprecationWarning: