Bug#1151182: python-futurist: FTBFS: FAIL: futurist.tests.test_executors.TestDelayedExecutorMixin.test_shutdown_cancel_futures_cancels_pending_tasks(thread)

[Santiago Vila]

I forgot: The failing test is the same which fails here:

https://ci.debian.net/packages/p/python-futurist/testing/i386/76544992/

Thanks.