new_contents: import pytest
  from django.contrib.admin import site
  from django.contrib.auth.models import User
  from django.test import TestCase
  
  from rest_framework.authtoken.admin import TokenAdmin
  from rest_framework.authtoken.models import Token
  from rest_framework.authtoken.serializers import AuthTokenSerializer
  from rest_framework.exceptions import ValidationError
  
  
  class AuthTokenTests(TestCase):
  
      def setUp(self):
          self.site = site
          self.user = User.objects.create_user(username='test_user')
          self.token = Token.objects.create(key='test token', user=self.user)
  
      def test_model_admin_displayed_fields(self):
          mock_request = object()
          token_admin = TokenAdmin(self.token, self.site)
          assert token_admin.get_fields(mock_request) == ('user',)
  
      def test_token_string_representation(self):
          assert str(self.token) == 'test token'
  
      def test_validate_raise_error_if_no_credentials_provided(self):
          with pytest.raises(ValidationError):
              AuthTokenSerializer().validate({})
  
subject: Add couple of test for AuthToken (#4816)