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
@@ -26,6 +26,7 @@ from django.test import TestCase
 
 # Application imports.
 from conntrackt.models import Project, Location, Entity, Interface, Communication
+from conntrackt.models import SearchManager
 
 # Test imports.
 from .factories import ProjectFactory, LocationFactory
@@ -64,6 +65,13 @@ class ProjectTest(TestCase):
 
         self.assertEqual(project.get_absolute_url(), "/conntrackt/project/1/")
 
+    def test_custom_manager(self):
+        """
+        Tests if the custom manager is being used.
+        """
+
+        self.assertIsInstance(Project.objects, SearchManager)
+
 
 class LocationTest(TestCase):
 
@@ -159,6 +167,13 @@ class EntityTest(TestCase):
         entity.project = new_project
         self.assertRaisesRegexp(ValidationError, "The entity cannot be moved to different project as long as it has valid communications with entities in current project.", entity.clean)
 
+    def test_custom_manager(self):
+        """
+        Tests if the custom manager is being used.
+        """
+
+        self.assertIsInstance(Entity.objects, SearchManager)
+
 
 class InterfaceTest(TestCase):