Changed the way ProviderId is made to include URI scheme portion.
diff --git a/core/api/src/test/java/org/onlab/onos/net/link/LinkEventTest.java b/core/api/src/test/java/org/onlab/onos/net/link/LinkEventTest.java
index dae9f85..aa95a42 100644
--- a/core/api/src/test/java/org/onlab/onos/net/link/LinkEventTest.java
+++ b/core/api/src/test/java/org/onlab/onos/net/link/LinkEventTest.java
@@ -16,7 +16,7 @@
 public class LinkEventTest extends AbstractEventTest {
 
     private Link createLink() {
-        return new DefaultLink(new ProviderId("foo"),
+        return new DefaultLink(new ProviderId("of", "foo"),
                                new ConnectPoint(deviceId("of:foo"), portNumber(1)),
                                new ConnectPoint(deviceId("of:bar"), portNumber(2)),
                                Link.Type.INDIRECT);