diff --git a/java_gen/pre-written/src/test/java/org/projectfloodlight/openflow/types/IPv4Test.java b/java_gen/pre-written/src/test/java/org/projectfloodlight/openflow/types/IPv4Test.java
new file mode 100644
index 0000000..464323f
--- /dev/null
+++ b/java_gen/pre-written/src/test/java/org/projectfloodlight/openflow/types/IPv4Test.java
@@ -0,0 +1,130 @@
+package org.projectfloodlight.openflow.types;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.junit.Test;
+import org.projectfloodlight.openflow.exceptions.OFParseError;
+
+public class IPv4Test {
+    byte[][] testAddresses = new byte[][] {
+            {0x01, 0x02, 0x03, 0x04 },
+            {127, 0, 0, 1},
+            {(byte) 192, (byte) 168, 0, 100 },
+            {(byte) 255, (byte) 255, (byte) 255, (byte) 255 }
+    };
+
+    String[] testStrings = {
+            "1.2.3.4",
+            "127.0.0.1",
+            "192.168.0.100",
+            "255.255.255.255"
+    };
+
+    int[] testInts = {
+            0x01020304,
+            0x7f000001,
+            (192 << 24) | (168 << 16) | 100,
+            0xffffffff
+    };
+
+    String[] invalidIPs = {
+            "",
+            ".",
+            "1.2..3.4",
+            "1.2.3.4.",
+            "257.11.225.1",
+            "-1.2.3.4",
+            "1.2.3.4.5",
+            "1.x.3.4",
+            "1.2x.3.4"
+    };
+
+    String[] ipsWithMask = {
+                            "1.2.3.4/24",
+                            "192.168.130.140/255.255.192.0",
+                            "127.0.0.1/8",
+                            "8.8.8.8",
+    };
+
+    boolean[] hasMask = {
+                         true,
+                         true,
+                         true,
+                         false
+    };
+
+    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 }
+    };
+
+
+    @Test
+    public void testOfString() {
+        for(int i=0; i < testAddresses.length; i++ ) {
+            IPv4 ip = IPv4.of(testStrings[i]);
+            assertEquals(testInts[i], ip.getInt());
+            assertArrayEquals(testAddresses[i], ip.getBytes());
+            assertEquals(testStrings[i], ip.toString());
+        }
+    }
+
+    @Test
+    public void testOfByteArray() {
+        for(int i=0; i < testAddresses.length; i++ ) {
+            IPv4 ip = IPv4.of(testAddresses[i]);
+            assertEquals(testInts[i], ip.getInt());
+            assertArrayEquals(testAddresses[i], ip.getBytes());
+            assertEquals(testStrings[i], ip.toString());
+        }
+    }
+
+    @Test
+    public void testReadFrom() throws OFParseError {
+        for(int i=0; i < testAddresses.length; i++ ) {
+            IPv4 ip = IPv4.read4Bytes(ChannelBuffers.copiedBuffer(testAddresses[i]));
+            assertEquals(testInts[i], ip.getInt());
+            assertArrayEquals(testAddresses[i], ip.getBytes());
+            assertEquals(testStrings[i], ip.toString());
+        }
+    }
+
+
+    @Test
+    public void testInvalidIPs() throws OFParseError {
+        for(String invalid : invalidIPs) {
+            try {
+                IPv4.of(invalid);
+                fail("Invalid IP "+invalid+ " should have raised IllegalArgumentException");
+            } catch(IllegalArgumentException e) {
+                // ok
+            }
+        }
+    }
+
+    @Test
+    public void testOfMasked() throws OFParseError {
+        for (int i = 0; i < ipsWithMask.length; i++) {
+            IPv4WithMask value = IPv4WithMask.of(ipsWithMask[i]);
+            if (!hasMask[i]) {
+                IPv4 ip = value.getValue();
+                assertArrayEquals(ipsWithMaskValues[i][0], ip.getBytes());
+            } else if (hasMask[i]) {
+                byte[] ipBytes = new byte[4];
+                System.arraycopy(ipsWithMaskValues[i][0], 0, ipBytes, 0, 4);
+                assertEquals(ipBytes.length, value.getValue().getBytes().length);
+                for (int j = 0; j < ipBytes.length; j++) {
+                    ipBytes[j] &= ipsWithMaskValues[i][1][j];
+                }
+
+                assertArrayEquals(ipBytes, value.getValue().getBytes());
+                assertArrayEquals(ipsWithMaskValues[i][1], value.getMask().getBytes());
+            }
+        }
+    }
+}