mock called never gets set after upgrade to 2.1

[Julz]

after upgrading from 2.0.9 to 2.1.2 we have a problem with a test like this:

@patch.object(SomeModelAdmin, 'action_to_mock')
def test_admin_action_is_triggered(self, action_mock):
    url = reverse('admin:some_model_changelist')
    data = {'action': 'action_to_mock', '_selected_action': [1, 2]}
    self.client.post(url, data)
    self.assertTrue(action_mock.called)

on versions <2.1 it works fine. called is set to True and the call_count increases.
I can't find anything in the changelogs so I assume it's a bug

[Simon Charette]

This was probably caused by #29419.

Which is mentioned in the release notes

​https://docs.djangoproject.com/en/2.1/releases/2.1/#minor-features
​https://docs.djangoproject.com/en/2.1/ref/contrib/admin/actions/#setting-permissions-for-actions

Since you are mocking the function you must make sure it doesn't have an allowed_permissions attribute

​https://github.com/django/django/commit/958c7b301ead79974db8edd5b9c6588a10a28ae7#diff-3c42de3e53aba87b32c494f995a728dfR878

A simple delattr(action_mock, 'allowed_permissions') before the self.client.post should do.

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