Implement unit test for HostHandler

Change-Id: I0ba37731f70b98019962b4f7deaf88fc2245ea6c
diff --git a/src/main/java/org/onosproject/segmentrouting/HostHandler.java b/src/main/java/org/onosproject/segmentrouting/HostHandler.java
index 399652b..3f5826b 100644
--- a/src/main/java/org/onosproject/segmentrouting/HostHandler.java
+++ b/src/main/java/org/onosproject/segmentrouting/HostHandler.java
@@ -47,7 +47,7 @@
  */
 public class HostHandler {
     private static final Logger log = LoggerFactory.getLogger(HostHandler.class);
-    private final SegmentRoutingManager srManager;
+    protected final SegmentRoutingManager srManager;
     private HostService hostService;
     private FlowObjectiveService flowObjectiveService;