--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.api.interop.java.test/src/com/oracle/truffle/api/interop/java/test/MethodMessageTest.java	Mon Sep 07 17:07:20 2015 +0200
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2015, 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 com.oracle.truffle.api.interop.java.test;
+
+import com.oracle.truffle.api.interop.TruffleObject;
+import com.oracle.truffle.api.interop.java.JavaInterop;
+import com.oracle.truffle.api.interop.java.MethodMessage;
+import static org.junit.Assert.*;
+import org.junit.Test;
+
+public class MethodMessageTest {
+    interface MathWrap {
+        @MethodMessage(message = "READ")
+        MaxFunction max();
+    }
+
+    interface MaxFunction {
+        @MethodMessage(message = "IS_NULL")
+        boolean isNull();
+
+        @MethodMessage(message = "HAS_SIZE")
+        boolean isArray();
+
+        @MethodMessage(message = "GET_SIZE")
+        int size();
+
+        @MethodMessage(message = "IS_EXECUTABLE")
+        boolean canExecute();
+
+        @MethodMessage(message = "EXECUTE")
+        Number compute(int a, int b);
+    }
+
+    @Test
+    public void functionTest() throws Exception {
+        TruffleObject truffleMath = JavaInterop.asTruffleObject(Math.class);
+        MathWrap wrap = JavaInterop.asJavaObject(MathWrap.class, truffleMath);
+        MaxFunction functionArityTwo = wrap.max();
+        assertTrue("function can be executed", functionArityTwo.canExecute());
+        assertFalse("function isn't null", functionArityTwo.isNull());
+        assertFalse("function isn't array", functionArityTwo.isArray());
+        int res = functionArityTwo.compute(10, 5).intValue();
+        assertEquals(10, res);
+    }
+
+    @Test
+    public void workWithAnArray() throws Exception {
+        TruffleObject arr = JavaInterop.asTruffleObject(new Object[]{1, 2, 3});
+
+        MaxFunction wrap = JavaInterop.asJavaObject(MaxFunction.class, arr);
+
+        assertTrue("It is an array", wrap.isArray());
+        assertFalse("No function", wrap.canExecute());
+        assertFalse("Not null", wrap.isNull());
+
+        assertEquals("Size is 3", 3, wrap.size());
+    }
+}