text: from django.test import TestCase
  from django.contrib.auth import get_user_model
  
  
  class ModelTests(TestCase):
  
      def test_create_user_with_email_successful(self):
          """Test creating a new user with an email is successful"""
          email = 'test@londonappdev.com'
          password = 'Password123'
          user = get_user_model().objects.create_user(
  			email=email,
  			password=password
  		)
  
          self.assertEqual(user.email, email)
          self.assertTrue(user.check_password(password))
  
      def test_new_user_email_normalized(self):
          """Test the email for a new user is normalized"""
          email = 'test@LONDONAPPDEV.com'
          user = get_user_model().objects.create_user(email, 'test123')
  
          self.assertEqual(user.email, email.lower())
  
      def test_new_user_invalid_email(self):
          """Test creating user with no email raises error"""
          with self.assertRaises(ValueError):
              get_user_model().objects.create_user(None, 'test123')
  
      def test_new_superuser(self):
          """Test creating a new superuser"""
          user = get_user_model().objects.create_superuser(
              'test@londonappdev.com',
              'test123'
          )
  
          self.assertTrue(user.is_superuser)
          self.assertTrue(user.is_staff)