diff --git a/java_gen/pre-written/src/test/java/org/projectfloodlight/protocol/OFOxmListTest.java b/java_gen/pre-written/src/test/java/org/projectfloodlight/protocol/OFOxmListTest.java
new file mode 100644
index 0000000..39e8c0c
--- /dev/null
+++ b/java_gen/pre-written/src/test/java/org/projectfloodlight/protocol/OFOxmListTest.java
@@ -0,0 +1,41 @@
+package org.projectfloodlight.protocol;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertThat;
+
+import org.hamcrest.CoreMatchers;
+import org.junit.Before;
+import org.junit.Test;
+import org.projectfloodlight.openflow.protocol.OFFactories;
+import org.projectfloodlight.openflow.protocol.OFOxmList;
+import org.projectfloodlight.openflow.protocol.OFVersion;
+import org.projectfloodlight.openflow.protocol.match.MatchField;
+import org.projectfloodlight.openflow.protocol.oxm.OFOxmIpv6DstMasked;
+import org.projectfloodlight.openflow.protocol.oxm.OFOxmIpv6SrcMasked;
+import org.projectfloodlight.openflow.protocol.oxm.OFOxms;
+import org.projectfloodlight.openflow.types.IPv6AddressWithMask;
+
+public class OFOxmListTest {
+    private OFOxms oxms;
+
+    @Before
+    public void setup() {
+        oxms = OFFactories.getFactory(OFVersion.OF_13).oxms();
+    }
+
+    @Test
+    public void testCanonicalize() {
+        OFOxmList.Builder builder = new OFOxmList.Builder();
+        IPv6AddressWithMask fullMasked = IPv6AddressWithMask.of("::/0");
+        OFOxmIpv6DstMasked  fullMaskedOxm = oxms.ipv6DstMasked(fullMasked.getValue(), fullMasked.getMask());
+        builder.set(fullMaskedOxm);
+
+        IPv6AddressWithMask address= IPv6AddressWithMask.of("1:2:3:4:5:6::8");
+        OFOxmIpv6SrcMasked  addressSrcOxm = oxms.ipv6SrcMasked(address.getValue(), address.getMask());
+        builder.set(addressSrcOxm);
+
+        OFOxmList list = builder.build();
+        assertThat(list.get(MatchField.IPV6_DST), CoreMatchers.nullValue());
+        assertFalse(list.get(MatchField.IPV6_SRC).isMasked());
+    }
+}