@Test
public void readLogicallyEmpty() throws Exception {

    InputStream inputStream = new ByteArrayInputStream("{}".getBytes(UTF_8));
    graph.io(testBdio(TT.Metadata, TT.id)).readGraph(inputStream, null, null);
    GraphTraversal<Vertex, Vertex> namedGraphs = graph.traversal().V().hasLabel(TT.Metadata);
    assertThat(namedGraphs.hasNext()).isTrue();
}