diff --git a/conntrackt/tests/test_models.py b/conntrackt/tests/test_models.py
--- a/conntrackt/tests/test_models.py
+++ b/conntrackt/tests/test_models.py
@@ -32,43 +32,6 @@ class EntityTest(TestCase):
 
         self.assertItemsEqual(entity.outgoing_communications(), outgoing)
 
-    def test_unique_communication(self):
-        """
-        Test enforcement of unique communications.
-        """
-
-        comm = Communication.objects.get(pk=1)
-
-        self.assertRaises(IntegrityError, Communication.objects.create, source=comm.source, destination=comm.destination, protocol=comm.protocol, port=comm.port, description="Duplicate communication.")
-
-    def test_project_same(self):
-        """
-        Test enforcement of same project entities for communications.
-        """
-
-        ent1 = Entity.objects.get(name="Test Entity 1")
-        ent1_eth0 = ent1.interface_set.get(name="eth0")
-        ent2 = Entity.objects.get(name="Other Project Test Entity")
-        ent2_eth0 = ent2.interface_set.get(name="eth0")
-
-        # Set-up a communication between different projects.
-        comm = Communication.objects.create(source=ent1_eth0, destination=ent2_eth0, protocol="ICMP", port="8", description="Ping.")
-
-        self.assertRaises(ValidationError, comm.full_clean)
-
-    def test_unsupported_protocol(self):
-        """
-        Test enforcement of supported protocol.
-        """
-
-        ent1 = Entity.objects.get(name="Test Entity 1")
-        ent1_eth0 = ent1.interface_set.get(name="eth0")
-        ent2 = Entity.objects.get(name="Test Entity 2")
-        ent2_eth0 = ent1.interface_set.get(name="eth0")
-
-        comm = Communication(source=ent1_eth0, destination=ent2_eth0, protocol="BOGUS", port="1234")
-        self.assertRaises(ValidationError, comm.full_clean)
-
     def test_representation(self):
         """
         Test the representation of entity.
@@ -102,3 +65,79 @@ class InterfaceTest(TestCase):
         representation = "Test Subnet (192.168.2.0/255.255.255.0)"
 
         self.assertEqual(str(interface), representation)
+
+
+class CommunicationTest(TestCase):
+    fixtures = ['test-data.json']
+
+    def test_unique_communication(self):
+        """
+        Test enforcement of unique communications.
+        """
+
+        comm = Communication.objects.get(pk=1)
+
+        self.assertRaises(IntegrityError, Communication.objects.create, source=comm.source, destination=comm.destination, protocol=comm.protocol, port=comm.port, description="Duplicate communication.")
+
+    def test_project_same(self):
+        """
+        Test enforcement of same project entities for communications.
+        """
+
+        ent1 = Entity.objects.get(name="Test Entity 1")
+        ent1_eth0 = ent1.interface_set.get(name="eth0")
+        ent2 = Entity.objects.get(name="Other Project Test Entity")
+        ent2_eth0 = ent2.interface_set.get(name="eth0")
+
+        # Set-up a communication between different projects.
+        comm = Communication.objects.create(source=ent1_eth0, destination=ent2_eth0, protocol="ICMP", port="8", description="Ping.")
+
+        self.assertRaisesRegexp(ValidationError, 'Source and destination entities do not belong to the same project', comm.full_clean)
+
+    def test_same_entity(self):
+        """
+        Test enforcement of differing entities for communication.
+        """
+
+        ent = Entity.objects.get(name="Test Entity 1")
+        ent_eth0 = ent.interface_set.get(name="eth0")
+
+        # Set-up a communication between same entity.
+        comm = Communication.objects.create(source=ent_eth0, destination=ent_eth0, protocol="ICMP", port="8", description="Ping.")
+
+        self.assertRaisesRegexp(ValidationError, "Source and destination entities are identical.", comm.full_clean)
+
+    def test_unsupported_protocol(self):
+        """
+        Test enforcement of supported protocol.
+        """
+
+        ent1 = Entity.objects.get(name="Test Entity 1")
+        ent1_eth0 = ent1.interface_set.get(name="eth0")
+        ent2 = Entity.objects.get(name="Test Entity 2")
+        ent2_eth0 = ent2.interface_set.get(name="eth0")
+
+        comm = Communication(source=ent1_eth0, destination=ent2_eth0, protocol="BOGUS", port="1234")
+
+        self.assertRaisesRegexp(ValidationError, "BOGUS is not a supported protocol.", comm.full_clean)
+
+    def test_edit_link(self):
+        """
+        Tests the function for getting the edit link string.
+        """
+
+        comm = Communication.objects.get(pk=1)
+
+        self.assertEqual("Edit", comm.edit_link())
+
+    def test_representation(self):
+        """
+        Test the representation of communication.
+        """
+
+        comm = Communication.objects.get(pk=1)
+
+        expected = "Test Entity 2 -> Test Entity 1 (TCP:22)"
+
+        self.assertEqual(expected, str(comm))
+