test: Mock out interface lookups

This will make it possible to do interface lookups inside of our classes
during testing without depending on real interfaces existing.

Change-Id: I4c273d6961fa4229401fb25a0e5eb06af5b59ca4
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/test/test_network_manager.cpp b/test/test_network_manager.cpp
index ff0840e..f4de35a 100644
--- a/test/test_network_manager.cpp
+++ b/test/test_network_manager.cpp
@@ -71,6 +71,7 @@
     try
     {
         // Adds the following ip in the getifaddrs list.
+        mock_addIF("igb1", 2);
         mock_addIP("igb1", "192.0.2.3", "255.255.255.128",
                    IFF_UP | IFF_RUNNING);
 
@@ -92,9 +93,11 @@
 {
     try
     {
+        mock_addIF("igb0", 1);
         mock_addIP("igb0", "192.0.2.2", "255.255.255.128",
                    IFF_UP | IFF_RUNNING);
 
+        mock_addIF("igb1", 2);
         mock_addIP("igb1", "192.0.2.3", "255.255.255.128",
                    IFF_UP | IFF_RUNNING);