@Test(expected = RuntimeException.class)
    public void shouldThrowExceptionIfGraphDoesNotHaveOpenMethodViaMapConfig() {
        final Map<String,Object> conf = new HashMap<>();
        conf.put(Graph.GRAPH, MockGraphWithoutOpen.class.getName());
        GraphFactory.open(conf);
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/structure/util/GraphFactoryTest.java