diff --git a/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/DefaultVirtualLinkTest.java b/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/DefaultVirtualLinkTest.java
index f522293..71e214a 100644
--- a/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/DefaultVirtualLinkTest.java
+++ b/incubator/api/src/test/java/org/onosproject/incubator/net/virtual/DefaultVirtualLinkTest.java
@@ -40,6 +40,60 @@
         assertThatClassIsImmutable(DefaultVirtualLink.class);
     }
 
+    /**
+     * Tests the DefaultVirtualLink Builder to ensure that the src cannot be null.
+     */
+    @Test(expected = NullPointerException.class)
+    public void testBuilderNullSrc() {
+        DefaultVirtualDevice device1 =
+                new DefaultVirtualDevice(NetworkId.networkId(0), DeviceId.deviceId(deviceIdValue1));
+        DefaultVirtualDevice device2 =
+                new DefaultVirtualDevice(NetworkId.networkId(0), DeviceId.deviceId(deviceIdValue2));
+        ConnectPoint src = new ConnectPoint(device1.id(), PortNumber.portNumber(1));
+        ConnectPoint dst = new ConnectPoint(device2.id(), PortNumber.portNumber(2));
+
+        DefaultVirtualLink.builder()
+                .src(null)
+                .build();
+    }
+
+    /**
+     * Tests the DefaultVirtualLink Builder to ensure that the dst cannot be null.
+     */
+    @Test(expected = NullPointerException.class)
+    public void testBuilderNullDst() {
+        DefaultVirtualDevice device1 =
+                new DefaultVirtualDevice(NetworkId.networkId(0), DeviceId.deviceId(deviceIdValue1));
+        DefaultVirtualDevice device2 =
+                new DefaultVirtualDevice(NetworkId.networkId(0), DeviceId.deviceId(deviceIdValue2));
+        ConnectPoint src = new ConnectPoint(device1.id(), PortNumber.portNumber(1));
+        ConnectPoint dst = new ConnectPoint(device2.id(), PortNumber.portNumber(2));
+
+        DefaultVirtualLink.builder()
+                .dst(null)
+                .build();
+    }
+
+    /**
+     * Tests the DefaultVirtualLink Builder to ensure that the networkId cannot be null.
+     */
+    @Test(expected = NullPointerException.class)
+    public void testBuilderNullNetworkId() {
+        DefaultVirtualDevice device1 =
+                new DefaultVirtualDevice(NetworkId.networkId(0), DeviceId.deviceId(deviceIdValue1));
+        DefaultVirtualDevice device2 =
+                new DefaultVirtualDevice(NetworkId.networkId(0), DeviceId.deviceId(deviceIdValue2));
+        ConnectPoint src = new ConnectPoint(device1.id(), PortNumber.portNumber(1));
+        ConnectPoint dst = new ConnectPoint(device2.id(), PortNumber.portNumber(2));
+
+        DefaultVirtualLink.builder()
+                .networkId(null)
+                .build();
+    }
+
+    /**
+     * Tests the DefaultVirtualLink equality method.
+     */
     @Test
     public void testEquality() {
         DefaultVirtualDevice device1 =
@@ -49,10 +103,30 @@
         ConnectPoint src = new ConnectPoint(device1.id(), PortNumber.portNumber(1));
         ConnectPoint dst = new ConnectPoint(device2.id(), PortNumber.portNumber(2));
 
-        DefaultVirtualLink link1 = new DefaultVirtualLink(NetworkId.networkId(0), src, dst, TunnelId.valueOf(0));
-        DefaultVirtualLink link2 = new DefaultVirtualLink(NetworkId.networkId(0), src, dst, TunnelId.valueOf(0));
-        DefaultVirtualLink link3 = new DefaultVirtualLink(NetworkId.networkId(0), src, dst, TunnelId.valueOf(1));
-        DefaultVirtualLink link4 = new DefaultVirtualLink(NetworkId.networkId(1), src, dst, TunnelId.valueOf(0));
+        VirtualLink link1 = DefaultVirtualLink.builder()
+                .networkId(NetworkId.networkId(0))
+                .src(src)
+                .dst(dst)
+                .tunnelId(TunnelId.valueOf("1"))
+                .build();
+        VirtualLink link2 = DefaultVirtualLink.builder()
+                .networkId(NetworkId.networkId(0))
+                .src(src)
+                .dst(dst)
+                .tunnelId(TunnelId.valueOf("1"))
+                .build();
+        VirtualLink link3 = DefaultVirtualLink.builder()
+                .networkId(NetworkId.networkId(0))
+                .src(src)
+                .dst(dst)
+                .tunnelId(TunnelId.valueOf("2"))
+                .build();
+        VirtualLink link4 = DefaultVirtualLink.builder()
+                .networkId(NetworkId.networkId(1))
+                .src(src)
+                .dst(dst)
+                .tunnelId(TunnelId.valueOf("3"))
+                .build();
 
         new EqualsTester().addEqualityGroup(link1, link2).addEqualityGroup(link3)
                 .addEqualityGroup(link4).testEquals();