@Test(expected = IllegalArgumentException.class)
    public void shouldThrowWhenScripEngineDoesNotExist() {
        ScriptEngineCache.get("junk-that-no-one-would-ever-call-a-script-engine-83939473298432");
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/jsr223/ScriptEngineCacheTest.java