@Test
    public void shouldEvalWithNoBindings() throws Exception {
        final GremlinGroovyScriptEngine engine = new GremlinGroovyScriptEngine();
        engine.eval("def addItUp(x,y){x+y}");
        assertEquals(3, engine.eval("1+2"));
        assertEquals(3, engine.eval("addItUp(1,2)"));
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-groovy/src/test/java/org/apache/tinkerpop/gremlin/groovy/jsr223/GremlinGroovyScriptEngineTest.java