@Test(expected = IllegalArgumentException.class)
    public void shouldThrowExceptionOnIfConfigurationFileIsNotAnActualFile() {
        GraphFactory.open(TestSupport.makeTestDataDirectory(GraphFactoryTest.class, "path"));
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/structure/util/GraphFactoryTest.java