Started to work on topology abstraction.
Added more unit tests.
Changed mastership application to be synchronous.
diff --git a/net/api/src/test/java/org/onlab/onos/net/DefaultPortTest.java b/net/api/src/test/java/org/onlab/onos/net/DefaultPortTest.java
new file mode 100644
index 0000000..e9d3da6
--- /dev/null
+++ b/net/api/src/test/java/org/onlab/onos/net/DefaultPortTest.java
@@ -0,0 +1,47 @@
+package org.onlab.onos.net;
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Test;
+import org.onlab.onos.net.provider.ProviderId;
+
+import static org.junit.Assert.assertEquals;
+import static org.onlab.onos.net.Device.Type.SWITCH;
+import static org.onlab.onos.net.DeviceId.deviceId;
+import static org.onlab.onos.net.PortNumber.portNumber;
+
+/**
+ * Test of the default port model entity.
+ */
+public class DefaultPortTest {
+
+    private static final ProviderId PID = new ProviderId("foo");
+    private static final DeviceId DID1 = deviceId("of:foo");
+    private static final DeviceId DID2 = deviceId("of:bar");
+    private static final PortNumber P1 = portNumber(1);
+    private static final PortNumber P2 = portNumber(2);
+
+    @Test
+    public void testEquality() {
+        Device device = new DefaultDevice(PID, DID1, SWITCH, "m", "h", "s", "n");
+        Port p1 = new DefaultPort(device, portNumber(1), true);
+        Port p2 = new DefaultPort(device, portNumber(1), true);
+        Port p3 = new DefaultPort(device, portNumber(2), true);
+        Port p4 = new DefaultPort(device, portNumber(2), true);
+        Port p5 = new DefaultPort(device, portNumber(1), false);
+
+        new EqualsTester().addEqualityGroup(p1, p2)
+                .addEqualityGroup(p3, p4)
+                .addEqualityGroup(p5)
+                .testEquals();
+    }
+
+    @Test
+    public void basics() {
+        Device device = new DefaultDevice(PID, DID1, SWITCH, "m", "h", "s", "n");
+        Port port = new DefaultPort(device, portNumber(1), true);
+        assertEquals("incorrect element", device, port.element());
+        assertEquals("incorrect number", portNumber(1), port.number());
+        assertEquals("incorrect state", true, port.isEnabled());
+    }
+
+}