diff --git a/java_gen/pre-written/src/test/java/org/projectfloodlight/openflow/types/IPv4AddressTest.java b/java_gen/pre-written/src/test/java/org/projectfloodlight/openflow/types/IPv4AddressTest.java
index 4f3f968..38d60b3 100644
--- a/java_gen/pre-written/src/test/java/org/projectfloodlight/openflow/types/IPv4AddressTest.java
+++ b/java_gen/pre-written/src/test/java/org/projectfloodlight/openflow/types/IPv4AddressTest.java
@@ -2,8 +2,10 @@
 
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThat;
 import static org.junit.Assert.fail;
 
+import org.hamcrest.CoreMatchers;
 import org.jboss.netty.buffer.ChannelBuffers;
 import org.junit.Test;
 import org.projectfloodlight.openflow.exceptions.OFParseError;
@@ -47,20 +49,23 @@
                             "192.168.130.140/255.255.192.0",
                             "127.0.0.1/8",
                             "8.8.8.8",
+                            "0.0.0.0/0"
     };
 
     boolean[] hasMask = {
                          true,
                          true,
                          true,
-                         false
+                         false,
+                         true
     };
 
     byte[][][] ipsWithMaskValues = {
                              new byte[][] { new byte[] { (byte)0x01, (byte)0x02, (byte)0x03, (byte)0x04 }, new byte[] { (byte)0xFF, (byte)0xFF, (byte)0xFF, (byte)0x00 } },
                              new byte[][] { new byte[] { (byte)0xC0, (byte)0xA8, (byte)0x82, (byte)0x8C }, new byte[] { (byte)0xFF, (byte)0xFF, (byte)0xC0, (byte)0x00 } },
                              new byte[][] { new byte[] { (byte)0x7F, (byte)0x00, (byte)0x00, (byte)0x01 }, new byte[] { (byte)0xFF, (byte)0x00, (byte)0x00, (byte)0x00 } },
-                             new byte[][] { new byte[] { (byte)0x08, (byte)0x08, (byte)0x08, (byte)0x08 }, null }
+                             new byte[][] { new byte[] { (byte)0x08, (byte)0x08, (byte)0x08, (byte)0x08 }, null },
+                             new byte[][] { new byte[] { (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00 }, new byte[] { (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00 } }
     };
 
 
@@ -123,7 +128,8 @@
                 }
 
                 assertArrayEquals(ipBytes, value.getValue().getBytes());
-                assertArrayEquals(ipsWithMaskValues[i][1], value.getMask().getBytes());
+                assertThat(String.format("Byte comparison for mask of %s (%s)", ipsWithMask[i], value),
+                        value.getMask().getBytes(), CoreMatchers.equalTo(ipsWithMaskValues[i][1]));
             }
         }
     }