@Test
public void testCustomTextDocProducerDyadicConstructor() {

    Dataset dataset = (Dataset)Assembler.general.open(customDyadicTextDocProducerSpec) ;
    DatasetGraphText dsgText = (DatasetGraphText)dataset.asDatasetGraph() ;
    assertTrue(dsgText.getMonitor() instanceof CustomDyadicTextDocProducer) ;
    Node G = NodeFactory.createURI("http://example.com/G");
    Node S = NodeFactory.createURI("http://example.com/S");
    Node P = NodeFactory.createURI("http://example.com/P");
    Node O = NodeFactory.createLiteral("http://example.com/O");
    dsgText.begin(ReadWrite.WRITE);
    dsgText.add(G, S, P, O);
    dsgText.commit();
}