diff --git a/apps/registration/tests.py b/apps/registration/tests.py
index a2d0947..0bd1c2b 100644
--- a/apps/registration/tests.py
+++ b/apps/registration/tests.py
@@ -1,6 +1,7 @@
 import os
 
 from corres2math.tokens import email_validation_token
+from django.conf import settings
 from django.contrib.auth.models import User
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.sites.models import Site
@@ -10,6 +11,7 @@ from django.urls import reverse
 from django.utils.encoding import force_bytes
 from django.utils.http import urlsafe_base64_encode
 
+from .auth import CustomAuthUser
 from .models import AdminRegistration, CoachRegistration, Registration, StudentRegistration
 
 
@@ -325,6 +327,15 @@ class TestRegistration(TestCase):
         self.assertEqual(response.status_code, 200)
         self.assertTrue(response.context["object_list"])
 
+    def test_init_cas(self):
+        """
+        Load custom CAS authentication
+        """
+        self.assertEqual(settings.CAS_AUTH_CLASS, "registration.auth.CustomAuthUser")
+        attr = CustomAuthUser(self.user.username).attributs()
+        self.assertEqual(attr["matrix_username"], self.user.registration.matrix_username)
+        self.assertEqual(attr["display_name"], str(self.user.registration))
+
     def test_not_implemented_error(self):
         # Only for coverage
         self.assertRaises(NotImplementedError, lambda: Registration().type)