'``maximum_size`` is omitted from the returned dict if the dataset
maximum_size is None.'

def test_without_maximum_size(self):

    dataset = Dataset(dataset_id=unicode(uuid4()))
    expected_uuid = uuid4()
    expected = dict(dataset_id=dataset.dataset_id, primary=unicode(expected_uuid), metadata={}, deleted=False)
    self.assertEqual(expected, api_dataset_from_dataset_and_node(dataset, expected_uuid))
