text: from unittest.mock import patch
  
  from django.test import TestCase
  from django.contrib.auth import get_user_model
  
  from core import models
  
  def sample_user(email='test@koodon.com', password='testpass'):
      """Create a sample user"""
      return get_user_model().objects.create_user(email, password)
  
  
  class ModelTests(TestCase):
  
      def test_create_user_with_email_successful(self):
          """Test creating a new user with an email is successful"""
          email = 'test@naver.com'
          password = 'Testpass123'
          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@NAVER.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_create_new_superuser(self):
          """Test creating a new superuser"""
          user = get_user_model().objects.create_superuser(
              'test@naver.com',
              'test123'
          )
  
          self.assertTrue(user.is_superuser)
          self.assertTrue(user.is_staff)
  
      def test_tag_str(self):
          """Test the tag string representation"""
          tag = models.Tag.objects.create(
              user=sample_user(),
              name='Vegan'
          )
          
          self.assertEqual(str(tag), tag.name)
      
      def test_ingredient_str(self):
          """Test the ingredient string representation"""
          ingredient = models.Ingredient.objects.create(
              user=sample_user(),
              name='Cucumber'
          )
          
          self.assertEqual(str(ingredient), ingredient.name)
      
      def test_recipe_str(self):
          """Test the recipe string representation"""
          recipe = models.Recipe.objects.create(
              user=sample_user(),
              title='Steak and mushroom sauce',
              time_minutes=5,
              price=5.00
          )
          self.assertEqual(str(recipe), recipe.title)
      
      @patch('uuid.uuid4')
      def test_recipe_file_name_uuid(self, mock_uuid):
          """Test that image is saved in the correct location"""
          uuid = 'test-uuid'
          mock_uuid.return_value = uuid
          file_path = models.recipe_image_file_path(None, 'myimage.jpg')
          
          exp_path = f'uploads/recipe/{uuid}.jpg'
          self.assertEqual(file_path, exp_path)
          