Add a test for unsupported criterion type

Change-Id: I0820b8f7fe9a375554721438284b5e9352c289b2

@@ -31,9 +31,11 @@ import org.onosproject.net.flow.criteria.Criterion;
 
 import com.fasterxml.jackson.databind.node.ObjectNode;
 
-import static org.onlab.junit.TestUtils.getField;
 import static org.hamcrest.MatcherAssert.assertThat;
-import static org.hamcrest.Matchers.*;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.onlab.junit.TestUtils.getField;
+import static org.onlab.junit.TestUtils.setField;
 import static org.onosproject.codec.impl.CriterionJsonMatcher.matchesCriterion;
 
 /**
@@ -418,4 +420,16 @@ public class CriterionCodecTest {
         assertThat(result, matchesCriterion(criterion));
     }
 
+    /**
+     * Tests that an unimplemented criterion type only returns the type and
+     * no other data.
+     */
+    @Test
+    public void matchUnknownTypeTest() throws Exception {
+        Criterion criterion = Criteria.matchOpticalSignalType((byte) 250);
+        setField(criterion, "type", Criterion.Type.UNASSIGNED_40);
+        ObjectNode result = criterionCodec.encode(criterion, context);
+        assertThat(result.get("type").textValue(), is(criterion.type().toString()));
+        assertThat(result.size(), is(1));
+    }
 }