from unittest.mock import patch, MagicMock

from mymodule import my_signal, make_things_good


def test_doing_stuff():
mocked_doing_stuff = MagicMock()
mocked_doing_stuff = my_signal.connect(mocked_doing_stuff)

with patch('mymodule.doing_stuff', mocked_doing_stuff):
make_things_good()

mocked_doing_stuff.assert_called_once()