rib: Unit tests for RibManager

Change-Id: I8096089f6cc8a6eea7be51278b29700c79e68d5c
Refs: #1501
diff --git a/rib/rib-manager.cpp b/rib/rib-manager.cpp
index c5f8666..c8d6111 100644
--- a/rib/rib-manager.cpp
+++ b/rib/rib-manager.cpp
@@ -58,8 +58,8 @@
                      ),
   };
 
-RibManager::RibManager()
-  : m_face(getGlobalIoService())
+RibManager::RibManager(ndn::Face& face)
+  : m_face(face)
   , m_nfdController(m_face)
   , m_localhostValidator(m_face)
   , m_localhopValidator(m_face)