Add test of the IP unnumbered dump

Change-Id: Ic3e978faf58b43adb8a9fd0dea36eb4513fe0c64
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
diff --git a/test/test_neighbor.py b/test/test_neighbor.py
index c161eb8..9d91f03 100644
--- a/test/test_neighbor.py
+++ b/test/test_neighbor.py
@@ -296,6 +296,10 @@
         #
         self.pg2.set_unnumbered(self.pg1.sw_if_index)
 
+        unnum = self.vapi.ip_unnumbered_dump()
+        self.assertEqual(unnum[0].ip_sw_if_index, self.pg1.sw_if_index)
+        self.assertEqual(unnum[0].sw_if_index, self.pg2.sw_if_index)
+
         #
         # We should respond to ARP requests for the unnumbered to address
         # once an attached route to the source is known