Fix ONOS-151 to support installation of PointToPointIntent

- Now support installation of PointToPointIntent that specifies the same
  switches as source element ID and destination element ID

Change-Id: If206f3fde77ca198fe1df078e7292a05e5bd7424
diff --git a/core/api/src/test/java/org/onlab/onos/net/intent/PathIntentTest.java b/core/api/src/test/java/org/onlab/onos/net/intent/PathIntentTest.java
index 5fce240..4451e66 100644
--- a/core/api/src/test/java/org/onlab/onos/net/intent/PathIntentTest.java
+++ b/core/api/src/test/java/org/onlab/onos/net/intent/PathIntentTest.java
@@ -16,10 +16,21 @@
 package org.onlab.onos.net.intent;
 
 import org.junit.Test;
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.DefaultLink;
+import org.onlab.onos.net.DefaultPath;
+import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.NetTestTools;
 import org.onlab.onos.net.Path;
+import org.onlab.onos.net.PortNumber;
+import org.onlab.onos.net.provider.ProviderId;
+
+import java.util.Arrays;
 
 import static org.junit.Assert.assertEquals;
+import static org.onlab.onos.net.DeviceId.deviceId;
+import static org.onlab.onos.net.Link.Type.DIRECT;
+import static org.onlab.onos.net.PortNumber.portNumber;
 
 public class PathIntentTest extends ConnectivityIntentTest {
     // 111:11 --> 222:22
@@ -28,6 +39,21 @@
     // 111:11 --> 333:33
     private static final Path PATH2 = NetTestTools.createPath("222", "333");
 
+    private final ProviderId provider1 = new ProviderId("of", "1");
+    private final DeviceId device1 = deviceId("1");
+    private final DeviceId device2 = deviceId("2");
+    private final PortNumber port1 = portNumber(1);
+    private final PortNumber port2 = portNumber(2);
+    private final PortNumber port3 = portNumber(3);
+    private final PortNumber port4 = portNumber(4);
+    private final ConnectPoint cp1 = new ConnectPoint(device1, port1);
+    private final ConnectPoint cp2 = new ConnectPoint(device1, port2);
+    private final ConnectPoint cp3 = new ConnectPoint(device2, port3);
+    private final ConnectPoint cp4 = new ConnectPoint(device2, port4);
+    private final DefaultLink link1 = new DefaultLink(provider1, cp1, cp2, DIRECT);
+    private final DefaultLink link2 = new DefaultLink(provider1, cp1, cp2, DIRECT);
+    private final double cost = 1;
+
     @Test
     public void basics() {
         PathIntent intent = createOne();
@@ -46,4 +72,23 @@
     protected PathIntent createAnother() {
         return new PathIntent(APPID, MATCH, NOP, PATH2);
     }
+
+    /**
+     * Tests the constructor raises IllegalArgumentException when the same device is specified in
+     * source and destination of a link.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testRaiseExceptionWhenSameDevices() {
+        new PathIntent(APPID, MATCH, NOP, new DefaultPath(provider1, Arrays.asList(link1), cost));
+    }
+
+    /**
+     * Tests the constructor raises IllegalArgumentException when the different elements are specified
+     * in source element of the first link and destination element of the second link.
+     */
+    @Test(expected = IllegalArgumentException.class)
+    public void testRaiseExceptionWhenDifferentDevice() {
+        new PathIntent(APPID, MATCH, NOP, new DefaultPath(provider1, Arrays.asList(link1, link2), cost));
+    }
+
 }