Adding more unit tests.
diff --git a/core/api/src/test/java/org/onlab/onos/net/topology/DefaultTopologyEdgeTest.java b/core/api/src/test/java/org/onlab/onos/net/topology/DefaultTopologyEdgeTest.java
new file mode 100644
index 0000000..6c3c112
--- /dev/null
+++ b/core/api/src/test/java/org/onlab/onos/net/topology/DefaultTopologyEdgeTest.java
@@ -0,0 +1,54 @@
+package org.onlab.onos.net.topology;
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Test;
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.DefaultLink;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.PortNumber;
+import org.onlab.onos.net.provider.ProviderId;
+
+import static org.junit.Assert.assertEquals;
+import static org.onlab.onos.net.DeviceId.deviceId;
+import static org.onlab.onos.net.PortNumber.portNumber;
+
+/**
+ * Tests of the topology graph edge.
+ */
+public class DefaultTopologyEdgeTest {
+
+ static final DeviceId D1 = deviceId("1");
+ static final DeviceId D2 = deviceId("2");
+ static final PortNumber P1 = portNumber(1);
+ static final PortNumber P2 = portNumber(2);
+
+ static final ConnectPoint CP1 = new ConnectPoint(D1, P1);
+ static final ConnectPoint CP2 = new ConnectPoint(D2, P1);
+ static final ConnectPoint CP3 = new ConnectPoint(D2, P1);
+ static final ConnectPoint CP4 = new ConnectPoint(D1, P2);
+
+ static final DefaultTopologyVertex V1 = new DefaultTopologyVertex(D1);
+ static final DefaultTopologyVertex V2 = new DefaultTopologyVertex(D2);
+
+ static final ProviderId PID = new ProviderId("foo", "bar");
+
+ static final Link L1 = new DefaultLink(PID, CP1, CP2, Link.Type.INDIRECT);
+ static final Link L2 = new DefaultLink(PID, CP3, CP4, Link.Type.INDIRECT);
+
+ @Test
+ public void basics() {
+ DefaultTopologyEdge e = new DefaultTopologyEdge(V1, V2, L1);
+ assertEquals("incorrect src", V1, e.src());
+ assertEquals("incorrect dst", V2, e.dst());
+ assertEquals("incorrect link", L1, e.link());
+
+ new EqualsTester()
+ .addEqualityGroup(new DefaultTopologyEdge(V1, V2, L1),
+ new DefaultTopologyEdge(V1, V2, L1))
+ .addEqualityGroup(new DefaultTopologyEdge(V2, V1, L2),
+ new DefaultTopologyEdge(V2, V1, L2))
+ .testEquals();
+ }
+
+}
\ No newline at end of file