'If the era differs, it is updated.'

def test_different_era(self):

    state = self.UPDATE_ERA_1.update_cluster_state(self.INITIAL_CLUSTER)
    updated_state = self.UPDATE_ERA_2.update_cluster_state(state)
    self.assertEqual(updated_state, self.UPDATE_ERA_2.update_cluster_state(self.INITIAL_CLUSTER))
