old_contents: from django.contrib.auth import get_user_model
  from django.db import DataError
  from django.db import IntegrityError
  from django.test import TestCase
  
  
  class TestUserModel(TestCase):
      @classmethod
      def setUpClass(cls):
          super().setUpClass()
          cls.exampleuser = {
              'display_name': 'bla',
              'email': 'user@example.com',
              'password': 'notsafe'
          }
  
      def test_create_fails_if_email_is_not_unique(self):
          get_user_model().objects.create_user(**self.exampleuser)
          with self.assertRaises(IntegrityError):
              get_user_model().objects.create_user(**self.exampleuser)
  
      def test_create_fails_if_name_too_long(self):
          with self.assertRaises(DataError):
              too_long = self.exampleuser
              too_long['display_name'] = 'a' * 81
              get_user_model().objects.create_user(**too_long)
  
new_contents: from django.contrib.auth import get_user_model
  from django.db import DataError
  from django.db import IntegrityError
  from django.test import TestCase
  
  from yunity.users.factories import UserFactory
  
  
  class TestUserModel(TestCase):
      @classmethod
      def setUpClass(cls):
          super().setUpClass()
          cls.user = UserFactory()
          cls.exampleuser = {
              'display_name': 'bla',
              'email': 'user@example.com',
              'password': 'notsafe'
          }
  
      def test_create_fails_if_email_is_not_unique(self):
          get_user_model().objects.create_user(**self.exampleuser)
          with self.assertRaises(IntegrityError):
              get_user_model().objects.create_user(**self.exampleuser)
  
      def test_create_fails_if_name_too_long(self):
          with self.assertRaises(DataError):
              too_long = self.exampleuser
              too_long['display_name'] = 'a' * 81
              get_user_model().objects.create_user(**too_long)
  
      def test_user_representation(self):
          r = repr(self.user)
          self.assertTrue(self.user.display_name in r)
  
subject: Add test for model representation