diff --git a/java_gen/pre-written/src/test/java/org/projectfloodlight/openflow/types/OFErrorCauseDataTest.java b/java_gen/pre-written/src/test/java/org/projectfloodlight/openflow/types/OFErrorCauseDataTest.java
new file mode 100644
index 0000000..9a5a4dc
--- /dev/null
+++ b/java_gen/pre-written/src/test/java/org/projectfloodlight/openflow/types/OFErrorCauseDataTest.java
@@ -0,0 +1,74 @@
+package org.projectfloodlight.openflow.types;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+import org.hamcrest.Matchers;
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.junit.Test;
+import org.projectfloodlight.openflow.protocol.OFFactories;
+import org.projectfloodlight.openflow.protocol.OFFlowAdd;
+import org.projectfloodlight.openflow.protocol.OFVersion;
+
+public class OFErrorCauseDataTest {
+    @Test
+    public void testEmpty() {
+        OFErrorCauseData emptyCause = OFErrorCauseData.of(new byte[] {}, OFVersion.OF_13);
+        assertThat(emptyCause.getData(), equalTo(new byte[] {}));
+        assertThat(emptyCause.getParsedMessage().isPresent(), equalTo(false));
+        assertThat(emptyCause.toString(), Matchers.containsString("unparsed"));
+    }
+
+    @Test
+    public void testTooShort() {
+        OFErrorCauseData emptyCause = OFErrorCauseData.of(new byte[] {0x1, 0x2}, OFVersion.OF_13);
+        assertThat(emptyCause.getData(), equalTo(new byte[] {0x1, 0x2}));
+        assertThat(emptyCause.getParsedMessage().isPresent(), equalTo(false));
+        assertThat(emptyCause.toString(), Matchers.containsString("unparsed"));
+        assertThat(emptyCause.toString(), Matchers.containsString("01 02"));
+    }
+
+    byte[] truncatedFlowAddd = new byte[] {
+            0x04, 0x0e, // version, type
+            0x00, (byte) 0x80, // length
+            0x12, 0x34, 0x56, 0x78, // xid
+            (byte) 0xfe, (byte) 0xdc , (byte) 0xba, (byte) 0x98, 0x76, 0x54, 0x32, 0x10, // cookie
+            (byte) 0xff, 0x00, (byte) 0xff, 0x00, (byte) 0xff, 0x00, (byte) 0xff, 0x00, // cookie_mask
+            0x03 // table_id
+            // rest truncated
+    };
+
+    @Test
+    public void testTruncated() {
+        OFErrorCauseData emptyCause = OFErrorCauseData.of(truncatedFlowAddd, OFVersion.OF_13);
+        assertThat(emptyCause.getData(), equalTo(truncatedFlowAddd));
+        assertThat(emptyCause.getParsedMessage().isPresent(), equalTo(false));
+        assertThat(emptyCause.toString(), Matchers.containsString("unparsed"));
+        assertThat(emptyCause.toString(), Matchers.containsString("04 0e 00 80"));
+    }
+
+    @Test
+    public void testFlowAdd() {
+        OFFlowAdd flowAdd = OFFactories.getFactory(OFVersion.OF_13).buildFlowAdd()
+        .setXid(0x12345678)
+        .setCookie(U64.parseHex("FEDCBA9876543210"))
+        .setCookieMask(U64.parseHex("FF00FF00FF00FF00"))
+        .setTableId(TableId.of(3))
+        .setIdleTimeout(5)
+        .setHardTimeout(10)
+        .setPriority(6000)
+        .build();
+
+        ChannelBuffer bb = ChannelBuffers.dynamicBuffer();
+        flowAdd.writeTo(bb);
+        byte[] flowAddBytes = new byte[bb.readableBytes()];
+        bb.readBytes(flowAddBytes);
+
+        OFErrorCauseData emptyCause = OFErrorCauseData.of(flowAddBytes, OFVersion.OF_13);
+        assertThat(emptyCause.getData(), equalTo(flowAddBytes));
+        assertThat(emptyCause.getParsedMessage().isPresent(), equalTo(true));
+        assertThat(emptyCause.toString(), Matchers.containsString("OFFlowAdd"));
+        assertThat(emptyCause.toString(), Matchers.containsString("idleTimeout=5"));
+    }
+}