Added unit tests for the event abstractions.
Added Element as the notion of common ancestry between Device and Host.
diff --git a/net/api/src/test/java/org/onlab/onos/event/TestListenerManager.java b/net/api/src/test/java/org/onlab/onos/event/TestListenerManager.java
new file mode 100644
index 0000000..a9f6213
--- /dev/null
+++ b/net/api/src/test/java/org/onlab/onos/event/TestListenerManager.java
@@ -0,0 +1,21 @@
+package org.onlab.onos.event;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Test event listener manager fixture.
+ */
+public class TestListenerManager
+ extends AbstractListenerManager<TestEvent, TestListener> {
+
+ public final List<Throwable> errors = new ArrayList<>();
+
+ @Override
+ protected void reportProblem(TestEvent event, Throwable error) {
+ super.reportProblem(event, error);
+ errors.add(error);
+ }
+
+}
+