protected <T> T findModelEntryObject(final String resourceName) {
        return model.find(resourceName).orElseThrow(() -> new IllegalStateException("Could not find requested model entry")).getObject();
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-util/src/test/java/org/apache/tinkerpop/gremlin/structure/io/AbstractCompatibilityTest.java