switch to ImmutableList

Change-Id: Ia5f8936d0aaf447253f5dde0db1ee688441d2472
diff --git a/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java b/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java
index f76513d..1bd2097 100644
--- a/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java
+++ b/core/store/serializers/src/test/java/org/onlab/onos/store/serializers/KryoSerializerTest.java
@@ -3,6 +3,7 @@
 import static org.junit.Assert.assertEquals;
 import static org.onlab.onos.net.DeviceId.deviceId;
 import static org.onlab.onos.net.PortNumber.portNumber;
+import static java.util.Arrays.asList;
 
 import java.nio.ByteBuffer;
 
@@ -11,6 +12,7 @@
 import org.junit.BeforeClass;
 import org.junit.Test;
 import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.cluster.RoleInfo;
 import org.onlab.onos.mastership.MastershipTerm;
 import org.onlab.onos.net.Annotations;
 import org.onlab.onos.net.ConnectPoint;
@@ -198,6 +200,12 @@
     }
 
     @Test
+    public void testRoleInfo() {
+        testSerialized(new RoleInfo(new NodeId("master"),
+                            asList(new NodeId("stby1"), new NodeId("stby2"))));
+    }
+
+    @Test
     public void testAnnotations() {
         // Annotations does not have equals defined, manually test equality
         final byte[] a1Bytes = serializer.encode(A1);