diff -r 59d5596a9c6c -r d382dacfd73f rt/vm/src/test/java/org/apidesign/vm4brwsr/VMinVMTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/vm/src/test/java/org/apidesign/vm4brwsr/VMinVMTest.java	Tue Feb 26 16:54:16 2013 +0100
@@ -0,0 +1,87 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.vm4brwsr;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import static org.testng.Assert.*;
+import org.testng.annotations.BeforeClass;
+import org.testng.annotations.Test;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+public class VMinVMTest {
+    private static TestVM code;
+    
+    @Test public void compareGeneratedCodeForArrayClass() throws Exception {
+        compareCode("org/apidesign/vm4brwsr/Array.class");
+    }
+
+    @Test public void compareGeneratedCodeForClassesClass() throws Exception {
+        compareCode("org/apidesign/vm4brwsr/Classes.class");
+    }
+
+    @BeforeClass
+    public void compileTheCode() throws Exception {
+        code = TestVM.compileClass("org/apidesign/vm4brwsr/VMinVM");
+    }
+    
+    private void compareCode(final String nm) throws Exception, IOException {
+        byte[] arr = BytesLoader.readClass(nm);
+        String ret1 = VMinVM.toJavaScript(arr);
+        
+        Object ret;
+        try {
+            ret = code.invokeFunction("bck2brwsr");
+            ret = code.invokeMethod(ret, "loadClass", VMinVM.class.getName());
+            ret = code.invokeMethod(ret, "toJavaScript__Ljava_lang_String_2_3B", arr);
+        } catch (Exception ex) {
+            File f = File.createTempFile("execution", ".js");
+            FileWriter w = new FileWriter(f);
+            w.append("var byteCode = [\n  ");
+            String sep = "";
+            for (int i = 0; i < arr.length; i++) {
+                w.append(sep).append(Integer.toString((arr[i] + 256) % 256));
+                sep = ", ";
+                if (i % 20 == 0) {
+                    w.append("\n  ");
+                }
+            }
+            w.append("\n];\n");
+            w.append(code.toString());
+            w.close();
+            throw new Exception(ex.getMessage() + " file: " + f, ex);
+        }
+
+        
+        assertTrue(ret instanceof String, "It is string: " + ret);
+        
+        if (!ret1.toString().equals(ret)) {
+            StringBuilder msg = new StringBuilder("Difference found between ");
+            msg.append(TestVM.dumpJS(ret1));
+            msg.append(" ");
+            msg.append(TestVM.dumpJS((CharSequence) ret));
+            msg.append(" compiled by ");
+            msg.append(code.toString());
+            fail(msg.toString());
+        }
+    }
+}