Added a wipe-out command; we need to revisit how to either make the devices come back or the links not come back.
diff --git a/core/trivial/src/test/java/org/onlab/onos/net/trivial/link/impl/SimpleLinkManagerTest.java b/core/trivial/src/test/java/org/onlab/onos/net/trivial/link/impl/SimpleLinkManagerTest.java
index 6eace8f..3702b0a 100644
--- a/core/trivial/src/test/java/org/onlab/onos/net/trivial/link/impl/SimpleLinkManagerTest.java
+++ b/core/trivial/src/test/java/org/onlab/onos/net/trivial/link/impl/SimpleLinkManagerTest.java
@@ -22,6 +22,7 @@
 import org.onlab.onos.net.provider.AbstractProvider;
 import org.onlab.onos.net.provider.ProviderId;
 import org.onlab.onos.event.impl.TestEventDispatcher;
+import org.onlab.onos.net.trivial.device.impl.SimpleDeviceManager;
 
 import java.util.ArrayList;
 import java.util.Iterator;
@@ -65,6 +66,7 @@
         admin = mgr;
         registry = mgr;
         mgr.eventDispatcher = new TestEventDispatcher();
+        mgr.deviceService = new SimpleDeviceManager();
         mgr.activate();
 
         service.addListener(listener);