@Test(expected = IllegalArgumentException.class)
    public void shouldNotGetGremlinScriptEngineAsItIsNotRegistered() {
        mgr.getEngineByName("gremlin-groovy");
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/jsr223/SingleScriptEngineManagerTest.java