def test_top_level_meta(self):
        author = Author.create_author("Wouter van Veen")

        path = self._test_path
        meta = Meta.create_top_level_meta(None, author, "")
        dataset = StructuredDataSet.create_dataset(path, "test_meta", meta)
        dataset.write()
    def test_branching(self):
        author = Author.create_author("Wouter van Veen")

        path = self._test_path
        meta = Meta.create_top_level_meta(None, author, "")
        dataset = StructuredDataSet.create_dataset(path, "test_meta_branching",
                                                   meta)

        x = dataset["x"]

        x["xx"] = numpy.zeros(30)

        dataset.write()
        x.meta.write()