'Volumes are unequal if they have different sizes.'

def test_inequality_size(self):

    service = object()
    v1 = Volume(node_id=u'123', name=MY_VOLUME, service=service, size=VolumeSize(maximum_size=12345))
    v2 = Volume(node_id=u'123', name=MY_VOLUME, service=service, size=VolumeSize(maximum_size=54321))
    assert_not_equal_comparison(self, v1, v2)
