@Before
    public void setup() throws Exception {
        graph = TinkerFactory.createModern();
        g = graph.traversal();
        if (System.getProperty(FileSandboxExtension.GREMLIN_SERVER_SANDBOX) == null) {
            final File f = TestHelper.generateTempFileFromResource(TinkerGraph.class, GremlinGroovyScriptEngineFileSandboxTest.class, "sandbox.yaml", ".yaml");
            System.setProperty(FileSandboxExtension.GREMLIN_SERVER_SANDBOX, Storage.toPath(f));
        }
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-groovy/src/test/java/org/apache/tinkerpop/gremlin/groovy/jsr223/GremlinGroovyScriptEngineFileSandboxTest.java