'Volumes are unequal if they have different services.'

def test_inequality_service(self):

    v1 = Volume(node_id=u'123', name=MY_VOLUME, service=object(), size=self.size)
    v2 = Volume(node_id=u'123', name=MY_VOLUME, service=object(), size=self.size)
    assert_not_equal_comparison(self, v1, v2)
