diff --git a/java_gen/pre-written/src/test/java/org/projectfloodlight/test/TestUtils.java b/java_gen/pre-written/src/test/java/org/projectfloodlight/test/TestUtils.java
new file mode 100644
index 0000000..7a5b8b0
--- /dev/null
+++ b/java_gen/pre-written/src/test/java/org/projectfloodlight/test/TestUtils.java
@@ -0,0 +1,62 @@
+package org.projectfloodlight.test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Assert;
+
+import com.google.common.base.Function;
+import com.google.common.base.Joiner;
+import com.google.common.collect.Lists;
+import com.google.common.primitives.Bytes;
+
+public class TestUtils {
+     private TestUtils() {}
+
+     private static final int PER_LINE = 8;
+
+     public static void betterAssertArrayEquals(byte[] expected, byte[] got) {
+         int maxlen = Math.max(expected.length, got.length);
+
+         List<String> expectedList = formatHex(Bytes.asList(expected));
+         List<String> gotList = formatHex(Bytes.asList(got));
+
+         boolean fail = false;
+         for (int i = 0; i < maxlen;i+= PER_LINE) {
+             int maxThisLine = Math.min(maxlen, PER_LINE);
+             boolean print = false;
+
+             ArrayList<String> changeMarkers = new ArrayList<String>();
+
+             for (int j = i; j < maxThisLine; j++) {
+                 if (j >= expected.length || j >= got.length  || expected[j] != got[j]) {
+                     print = true;
+                     fail = true;
+                     changeMarkers.add("==");
+                     break;
+                 } else {
+                     changeMarkers.add("  ");
+                 }
+             }
+             if(print) {
+                System.out.println(String.format("%4x: %s", i, Joiner.on(" ").join(expectedList.subList(i, Math.min(expectedList.size(), i+PER_LINE)))));
+                System.out.println(String.format("%4x: %s", i, Joiner.on(" ").join(gotList.subList(i, Math.min(gotList.size(), i+PER_LINE)))));
+                System.out.println(String.format("%4s  %s", "", Joiner.on(" ").join(changeMarkers)));
+                System.out.println("\n");
+             }
+         }
+         if(fail) {
+             Assert.fail("Array comparison failed");
+         }
+
+     }
+
+     private static List<String> formatHex(List<Byte> b) {
+         return Lists.transform(b, new Function<Byte, String>() {
+             @Override
+             public String apply(Byte input) {
+                 return String.format("%02x", input);
+             }
+         });
+     }
+}
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