diff --git a/wagtail/contrib/modeladmin/tests/test_page_modeladmin.py b/wagtail/contrib/modeladmin/tests/test_page_modeladmin.py
index ec2ac4c4c0..6b76a36232 100644
--- a/wagtail/contrib/modeladmin/tests/test_page_modeladmin.py
+++ b/wagtail/contrib/modeladmin/tests/test_page_modeladmin.py
@@ -1,5 +1,4 @@
 from django import VERSION as DJANGO_VERSION
-from django.contrib.auth import get_user_model
 from django.contrib.auth.models import Group, Permission
 from django.test import TestCase
 
@@ -278,10 +277,10 @@ class TestChooseParentViewForNonSuperuser(TestCase, WagtailTestUtils):
             permission_type='add'
         )
 
-        user = get_user_model().objects._create_user(username='test2', email='test2@email.com', password='password', is_staff=True, is_superuser=False)
+        user = self.create_user(username='test2', password='password')
         user.groups.add(business_editors)
         # Login
-        self.client.login(username='test2', password='password')
+        self.login(username='test2', password='password')
 
     def test_simple(self):
         response = self.client.get('/admin/tests/businesschild/choose_parent/')
@@ -291,40 +290,32 @@ class TestChooseParentViewForNonSuperuser(TestCase, WagtailTestUtils):
         self.assertNotContains(response, 'Private Business Index')
 
 
-class TestEditorAccess(TestCase):
+class TestEditorAccess(TestCase, WagtailTestUtils):
     fixtures = ['test_specific.json']
     expected_status_code = 403
 
-    def login(self):
+    def setUp(self):
         # Create a user
-        user = get_user_model().objects._create_user(username='test2', email='test2@email.com', password='password', is_staff=True, is_superuser=False)
+        user = self.create_user(username='test2', password='password')
         user.groups.add(Group.objects.get(pk=2))
         # Login
-        self.client.login(username='test2', password='password')
-        return user
-
-    def setUp(self):
-        self.login()
+        self.login(username='test2', password='password')
 
     def test_delete_permitted(self):
         response = self.client.get('/admin/tests/eventpage/delete/4/')
         self.assertEqual(response.status_code, self.expected_status_code)
 
 
-class TestModeratorAccess(TestCase):
+class TestModeratorAccess(TestCase, WagtailTestUtils):
     fixtures = ['test_specific.json']
     expected_status_code = 302
 
-    def login(self):
+    def setUp(self):
         # Create a user
-        user = get_user_model().objects._create_user(username='test3', email='test3@email.com', password='password', is_staff=True, is_superuser=False)
+        user = self.create_user(username='test3', password='password')
         user.groups.add(Group.objects.get(pk=1))
         # Login
-        self.client.login(username='test2', password='password')
-        return user
-
-    def setUp(self):
-        self.login()
+        self.login(username='test3', password='password')
 
     def test_delete_permitted(self):
         response = self.client.get('/admin/tests/eventpage/delete/4/')
diff --git a/wagtail/contrib/modeladmin/tests/test_simple_modeladmin.py b/wagtail/contrib/modeladmin/tests/test_simple_modeladmin.py
index 3295480a60..72c57dd92f 100644
--- a/wagtail/contrib/modeladmin/tests/test_simple_modeladmin.py
+++ b/wagtail/contrib/modeladmin/tests/test_simple_modeladmin.py
@@ -1,7 +1,6 @@
 from io import BytesIO
 from unittest import mock
 
-from django.contrib.auth import get_user_model
 from django.contrib.auth.models import Group
 from django.core import checks
 from django.test import TestCase
@@ -514,22 +513,19 @@ class TestDeleteViewModelReprPrimary(TestCase, WagtailTestUtils):
         self.assertEqual(response.status_code, 302)
 
 
-class TestEditorAccess(TestCase):
+class TestEditorAccess(TestCase, WagtailTestUtils):
     fixtures = ['modeladmintest_test.json']
     expected_status_code = 403
 
-    def login(self):
+    def setUp(self):
         # Create a user
-        user = get_user_model().objects._create_user(username='test2', email='test2@email.com', password='password', is_staff=True, is_superuser=False)
+        user = self.create_user(username='test2', password='password')
         user.groups.add(Group.objects.get(pk=2))
         # Login
-        self.client.login(username='test2', password='password')
+        self.login(username='test2', password='password')
 
         return user
 
-    def setUp(self):
-        self.login()
-
     def test_index_permitted(self):
         response = self.client.get('/admin/modeladmintest/book/')
         self.assertEqual(response.status_code, self.expected_status_code)