fw: require valid FaceId in outgoing Interest/Data pipelines

This is to avoid sending via a failed/closed face.

refs #1732

Change-Id: I31b205c2b97185e7955107a2591f8c4d2b7f0cc0
diff --git a/tests/daemon/fw/forwarder.cpp b/tests/daemon/fw/forwarder.cpp
index 3a20033..263967b 100644
--- a/tests/daemon/fw/forwarder.cpp
+++ b/tests/daemon/fw/forwarder.cpp
@@ -356,6 +356,8 @@
   shared_ptr<DummyFace> face4 = make_shared<DummyFace>();
   forwarder.addFace(face1);
   forwarder.addFace(face2);
+  forwarder.addFace(face3);
+  forwarder.addFace(face4);
 
   Pit& pit = forwarder.getPit();
   shared_ptr<Interest> interest0 = makeInterest("ndn:/");