diff -r 28dc692f3b11 -r 3a1f262311cf rt/emul/compacttest/src/test/java/org/apidesign/bck2brwsr/tck/ByteArithmeticTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/emul/compacttest/src/test/java/org/apidesign/bck2brwsr/tck/ByteArithmeticTest.java	Wed Nov 19 19:32:00 2014 +0100
@@ -0,0 +1,147 @@
+/**
+ * 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.bck2brwsr.tck;
+
+import org.apidesign.bck2brwsr.core.JavaScriptBody;
+import org.apidesign.bck2brwsr.vmtest.Compare;
+import org.apidesign.bck2brwsr.vmtest.VMTest;
+import org.testng.annotations.Factory;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+public class ByteArithmeticTest {
+    
+    private static byte add(byte x, byte y) {
+        return (byte)(x + y);
+    }
+    
+    private static byte sub(byte x, byte y) {
+        return (byte)(x - y);
+    }
+    
+    private static byte mul(byte x, byte y) {
+        return (byte)(x * y);
+    }
+    
+    private static byte div(byte x, byte y) {
+        return (byte)(x / y);
+    }
+    
+    private static byte mod(byte x, byte y) {
+        return (byte)(x % y);
+    }
+    
+    @Compare public byte conversion() {
+        return (byte)123456;
+    }
+    
+    @Compare public byte addOverflow() {
+        return add(Byte.MAX_VALUE, (byte)1);
+    }
+    
+    @Compare public byte subUnderflow() {
+        return sub(Byte.MIN_VALUE, (byte)1);
+    }
+    
+    @Compare public byte addMaxByteAndMaxByte() {
+        return add(Byte.MAX_VALUE, Byte.MAX_VALUE);
+    }
+    
+    @Compare public byte subMinByteAndMinByte() {
+        return sub(Byte.MIN_VALUE, Byte.MIN_VALUE);
+    }
+    
+    @Compare public byte multiplyMaxByte() {
+        return mul(Byte.MAX_VALUE, (byte)2);
+    }
+    
+    @Compare public byte multiplyMaxByteAndMaxByte() {
+        return mul(Byte.MAX_VALUE, Byte.MAX_VALUE);
+    }
+    
+    @Compare public byte multiplyMinByte() {
+        return mul(Byte.MIN_VALUE, (byte)2);
+    }
+    
+    @Compare public byte multiplyMinByteAndMinByte() {
+        return mul(Byte.MIN_VALUE, Byte.MIN_VALUE);
+    }
+    
+    @Compare public byte multiplyPrecision() {
+        return mul((byte)17638, (byte)1103);
+    }
+    
+    @Compare public byte division() {
+        return div((byte)1, (byte)2);
+    }
+    
+    @Compare public byte divisionReminder() {
+        return mod((byte)1, (byte)2);
+    }
+
+    private static int readShort(byte[] byteCodes, int offset) {
+        int signed = byteCodes[offset];
+        byte b0 = (byte)signed;
+        return (b0 << 8) | (byteCodes[offset + 1] & 0xff);
+    }
+    
+    private static int readShortArg(byte[] byteCodes, int offsetInstruction) {
+        return readShort(byteCodes, offsetInstruction + 1);
+    }
+    
+    @Compare public int readIntArgs255and156() {
+        final byte[] arr = new byte[] { (byte)0, (byte)255, (byte)156 };
+        
+        assert arr[1] == -1 : "First byte: " + arr[1];
+        assert arr[2] == -100 : "Second byte: " + arr[2];
+        final int ret = readShortArg(arr, 0);
+        assert ret < 65000: "Value: " + ret;
+        return ret;
+    }
+    
+    @JavaScriptBody(args = { "arr" }, body = "arr[1] = 255; arr[2] = 156; return arr;")
+    private static byte[] fill255and156(byte[] arr) {
+        arr[1] = (byte)255;
+        arr[2] = (byte)156;
+        return arr;
+    }
+
+    @Compare public int readIntArgs255and156JSArray() {
+        final byte[] arr = fill255and156(new byte[] { 0, 0, 0 });
+        
+        final int ret = readShortArg(arr, 0);
+        assert ret < 65000: "Value: " + ret;
+        return ret;
+    }
+    
+    @Compare public int readIntArgsMinus1andMinus100() {
+        final byte[] arr = new byte[] { (byte)0, (byte)-1, (byte)-100 };
+        
+        assert arr[1] == -1 : "First byte: " + arr[1];
+        assert arr[2] == -100 : "Second byte: " + arr[2];
+        
+        return readShortArg(arr, 0);
+    }
+    
+    @Factory
+    public static Object[] create() {
+        return VMTest.create(ByteArithmeticTest.class);
+    }
+}