ONOS-6225 Expose k-shortest path search as part of TopologyService.

Change-Id: Idf812a707aba0b972fcfbde871c624dfc86b6e1b
diff --git a/core/common/src/test/java/org/onosproject/common/DefaultTopologyTest.java b/core/common/src/test/java/org/onosproject/common/DefaultTopologyTest.java
index 48403d5..481e7f7 100644
--- a/core/common/src/test/java/org/onosproject/common/DefaultTopologyTest.java
+++ b/core/common/src/test/java/org/onosproject/common/DefaultTopologyTest.java
@@ -40,7 +40,6 @@
 import org.onosproject.net.topology.TopologyVertex;
 
 import java.util.Set;
-
 import static com.google.common.collect.ImmutableSet.of;
 import static org.junit.Assert.*;
 import static org.onosproject.net.DeviceId.deviceId;
@@ -121,6 +120,12 @@
 
         paths = dt.getPaths(D1, D3, WEIGHER);
         assertEquals("incorrect path count", 1, paths.size());
+
+        paths = dt.getKShortestPaths(D1, D2, 42);
+        assertEquals("incorrect path count", 2, paths.size());
+
+        assertEquals("incorrect path count", 2, dt.getKShortestPaths(D1, D2).limit(42).count());
+
     }
 
     @Test