--- /dev/null	2017-01-25 16:43:50.000000000 +0100
+++ new/test/src/jdk/nashorn/test/models/FunctionalInterfaceProvider.java	2017-01-25 16:43:50.000000000 +0100
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package jdk.nashorn.test.models;
+
+import jdk.nashorn.api.scripting.ScriptObjectMirror;
+import org.testng.Assert;
+
+import java.util.List;
+
+public class FunctionalInterfaceProvider {
+
+    private final static Object RETURN_TOKEN = new Object();
+
+    public static Functional getImpl() {
+        return (l) -> {
+            // Make sure parameters are properly exported
+            Assert.assertTrue(l.isEmpty()
+                    || l.get(0) == RETURN_TOKEN
+                    || l.get(0) instanceof ScriptObjectMirror
+                    || l.get(0) instanceof String);
+            return RETURN_TOKEN;
+        };
+    }
+
+    @FunctionalInterface
+    public interface Functional {
+        Object method(List<Object> args);
+    }
+
+}