'Verify deadline is unchanged by signal when explicitly set.'

def test_deadline_explicit(self):

    deadline = (datetime.now(tz=UTC) - timedelta(days=7))
    VerificationDeadline.set_deadline(self.course.id, deadline, is_explicit=True)
    _listen_for_course_publish('store', self.course.id)
    actual_deadline = VerificationDeadline.deadline_for_course(self.course.id)
    self.assertNotEqual(actual_deadline, self.course.end)
    self.assertEqual(actual_deadline, deadline)
