diff --git a/djangoldp/tests/runner.py b/djangoldp/tests/runner.py
index 955d313d13b93428ebc0446771a923edd9ce4cd6..1cf8604dbae8eda88317a21cac92b33636febbb5 100644
--- a/djangoldp/tests/runner.py
+++ b/djangoldp/tests/runner.py
@@ -25,7 +25,7 @@ from django.test.runner import DiscoverRunner
 test_runner = DiscoverRunner(verbosity=1)
 
 failures = test_runner.run_tests([
-    #'djangoldp.tests.tests_save',
+    'djangoldp.tests.tests_save',
     'djangoldp.tests.tests_update'])
 if failures:
     sys.exit(failures)
diff --git a/djangoldp/tests/tests_update.py b/djangoldp/tests/tests_update.py
index b01f646ce45e40101da70dc4d98d793f7bdfebce..7b232b4455e057d97544dac01999657d2d104ca4 100644
--- a/djangoldp/tests/tests_update.py
+++ b/djangoldp/tests/tests_update.py
@@ -195,21 +195,29 @@ class Serializer(TestCase):
             {
                 "@id": "https://happy-dev.fr/messages/{}/".format(message1.pk),
                 "text": "Message 1 UP",
-                "author_user_id": user1.pk,
+                "author_user": {
+                    '@id': "https://happy-dev.fr/users/{}/".format(user1.pk)
+                }
             },
             {
                 "@id": "https://happy-dev.fr/messages/{}/".format(message2.pk),
                 "text": "Message 2 UP",
-                "author_user_id": user1.pk,
+                "author_user": {
+                    '@id': "https://happy-dev.fr/users/{}/".format(user1.pk)
+                }
             },
             {
                 "@id": "_:b1",
                 "text": "Message 3 NEW",
-                "author_user_id": user1.pk,
+                "author_user": {
+                    '@id': "https://happy-dev.fr/users/{}/".format(user1.pk)
+                }
             },
             {
                 '@id': "https://happy-dev.fr/threads/{}".format(thread.pk),
-                "author_user_id": user1.pk,
+                "author_user": {
+                    '@id': "https://happy-dev.fr/users/{}/".format(user1.pk)
+                },
                 'description': "Thread 1 UP",
                 'message_set': {
                     "@id": "https://happy-dev.fr/threads/{}/message_set".format(thread.pk)
diff --git a/djangoldp/tests/urls.py b/djangoldp/tests/urls.py
index eeb96677bdb788fca6f79c753647b83f8e62fbd2..0066129ba1d57ef46610773bbcc237d840232f30 100644
--- a/djangoldp/tests/urls.py
+++ b/djangoldp/tests/urls.py
@@ -1,3 +1,5 @@
+from django.conf import settings
+
 from djangoldp.tests.models import Skill, JobOffer, Message, Thread
 from djangoldp.views import LDPViewSet
 from django.conf.urls import url
@@ -8,4 +10,5 @@ urlpatterns = [
     url(r'^job-offers/', LDPViewSet.urls(model=JobOffer, nested_fields=["skills"], permission_classes=())),
     url(r'^messages/', LDPViewSet.urls(model=Message, permission_classes=[], fields=["@id", "text"], nested_fields=[])),
     url(r'^threads/', LDPViewSet.urls(model=Thread, nested_fields=["message_set"], permission_classes=())),
+    url(r'^users/', LDPViewSet.urls(model=settings.AUTH_USER_MODEL, permission_classes=[])),
 ]
\ No newline at end of file