Implement basic unit tests for RouteHandler

In addition,
    - Refactor Segment Routing unit test mocking

Change-Id: I94cb75a8b12944264faa76301d58ee19f246d584
diff --git a/BUCK b/BUCK
index 073f5fe..b67b34b 100644
--- a/BUCK
+++ b/BUCK
@@ -20,6 +20,7 @@
 TEST_DEPS = [
     '//lib:TEST_ADAPTERS',
     '//incubator/api:onos-incubator-api-tests',
+    '//apps/route-service/api:onos-apps-route-service-api-tests',
 ]
 
 osgi_jar_with_tests (