text: import tempfile
  import os
  
  from PIL import Image
  
  from django.contrib.auth import get_user_model
  from django.test import TestCase
  from django.urls import reverse
  
  from rest_framework import status
  from rest_framework.test import APIClient
  
  from core.models import Recipe, Tag, Ingredient
  
  from recipe.serializers import RecipeSerializer, RecipeDetailSerializer
  
  RECIPES_URL = reverse('recipe:recipe-list')
  
  
  def image_upload_url(recipe_id):
      """Return URL for recipe image upload"""
      return reverse('recipe:recipe-upload-image', args=[recipe_id])
  
  
  def detail_url(recipe_id):
      """Return recipe detail URL"""
      return reverse('recipe:recipe-detail', args=[recipe_id])
  
  
  def sample_tag(user, name='Main course'):
      """Create and return a sample tag"""
      return Tag.objects.create(user=user, name=name)
  
  
  def sample_ingredient(user, name='Cinnamon'):
      """Create and return a sample ingredient"""
      return Ingredient.objects.create(user=user, name=name)
  
  
  def sample_recipe(user, **params):
      """Create and return a sample recipe"""
      defaults = {
          'title': 'Sample recipe',
          'time_minutes': 10,
          'price': 5.00
      }
      defaults.update(**params)
  
      return Recipe.objects.create(user=user, **defaults)
  
  
  class PublicRecipeApiTests(TestCase):
      """Test unauthenticated recipe API access"""
  
      def setUp(self):
          self.client = APIClient()
  
      def test_auth_required(self):
          """Test that authentication is required"""
          res = self.client.get(RECIPES_URL)
  
          self.assertEqual(res.status_code, status.HTTP_401_UNAUTHORIZED)
  
  
  class PrivateRecipeApiTests(TestCase):
      """Test authenticated recipe API access"""
  
      def setUp(self):
          self.client = APIClient()
          self.user = get_user_model().objects.create_user(
              'test@nur.com',
              'testpass'
          )
          self.client.force_authenticate(self.user)
  
      def test_retrive_recipes(self):
          """Test retrieving a list of recipes"""
  
          sample_recipe(user=self.user)
          sample_recipe(user=self.user)
  
          res = self.client.get(RECIPES_URL)
  
          recipes = Recipe.objects.all().order_by('-id')
          serializer = RecipeSerializer(recipes, many=True)
          self.assertEqual(res.status_code, status.HTTP_200_OK)
          self.assertEqual(res.data, serializer.data)
  
      def test_recipes_limited_to_user(self):
          """Test retriving recipes for user"""
          user2 = get_user_model().objects.create_user(
              'other@nur.com',
              'password123'
          )
          sample_recipe(user=user2)
          sample_recipe(user=self.user)
  
          res = self.client.get(RECIPES_URL)
  
          recipes = Recipe.objects.filter(user=self.user)
          serializer = RecipeSerializer(recipes, many=True)
          self.assertEqual(res.status_code, status.HTTP_200_OK)
          self.assertEqual(len(res.data), 1)
          self.assertEqual(res.data, serializer.data)
  
      def test_view_recipe_detail(self):
          """Test view a recipe detail"""
          recipe = sample_recipe(user=self.user)
          recipe.tags.add(sample_tag(user=self.user))
          recipe.ingredients.add(sample_ingredient(user=self.user))
  
          url = detail_url(recipe.id)
          res = self.client.get(url)
  
          serializer = RecipeDetailSerializer(recipe)
          self.assertEqual(res.data, serializer.data)
  
      def test_create_basic_recipe(self):
          """Test creating recipe"""
          payload = {
              'title': 'Chocolate cheesecake',
              'time_minutes': 30,
              'price': 5.00
          }
          res = self.client.post(RECIPES_URL, payload)
  
          self.assertEqual(res.status_code, status.HTTP_201_CREATED)
          recipe = Recipe.objects.get(id=res.data['id'])
          for key in payload.keys():
              self.assertEqual(payload[key], getattr(recipe, key))
  
      def test_create_recipe_with_tags(self):
          """Test creating a recipe with tags"""
          tag1 = sample_tag(user=self.user, name='Vegan')
          tag2 = sample_tag(user=self.user, name='Dessert')
          payload = {
              'title': 'Chocolate cheesecake',
              'tags': [tag1.id, tag2.id],
              'time_minutes': 30,
              'price': 5.00
          }
          res = self.client.post(RECIPES_URL, payload)
  
          self.assertEqual(res.status_code, status.HTTP_201_CREATED)
          recipe = Recipe.objects.get(id=res.data['id'])
          tags = recipe.tags.all()
          self.assertEqual(tags.count(), 2)
          self.assertIn(tag1, tags)
          self.assertIn(tag2, tags)
  
      def test_create_recipe_with_ingredients(self):
          """Test creating recipe with ingredients"""
          ingredient1 = sample_ingredient(user=self.user, name='Prawns')
          ingredient2 = sample_ingredient(user=self.user, name='Ginger')
          payload = {
              'title': 'Thai prawn red curry',
              'ingredients': [ingredient1.id, ingredient2.id],
              'time_minutes': 20,
              'price': 7.00
          }
          res = self.client.post(RECIPES_URL, payload)
  
          self.assertEqual(res.status_code, status.HTTP_201_CREATED)
          recipe = Recipe.objects.get(id=res.data['id'])
          ingredients = recipe.ingredients.all()
          self.assertEqual(ingredients.count(), 2)
          self.assertIn(ingredient1, ingredients)
          self.assertIn(ingredient2, ingredients)
  
      def test_partial_update_recipe(self):
          """Test updating a recipe with patch"""
          recipe = sample_recipe(user=self.user)
          recipe.tags.add(sample_tag(user=self.user))
          new_tag = sample_tag(user=self.user, name='Curry')
  
          payload = {
              'title': 'Chicken fry',
              'tags': [new_tag.id]
          }
          url = detail_url(recipe.id)
          self.client.patch(url, payload)
  
          recipe.refresh_from_db()
          self.assertEqual(recipe.title, payload['title'])
          tags = recipe.tags.all()
          self.assertEqual(len(tags), 1)
          self.assertIn(new_tag, tags)
  
      def test_full_update_recipe(self):
          """Test updating a recipe with put"""
          recipe = sample_recipe(user=self.user)
          recipe.tags.add(sample_tag(user=self.user))
          payload = {
              'title': 'Chicken soup',
              'time_minutes': 20,
              'price': 7.00
          }
          url = detail_url(recipe.id)
          self.client.put(url, payload)
  
          recipe.refresh_from_db()
          self.assertEqual(recipe.title, payload['title'])
          self.assertEqual(recipe.time_minutes, payload['time_minutes'])
          self.assertEqual(recipe.price, payload['price'])
          tags = recipe.tags.all()
          self.assertEqual(len(tags), 0)
  
  
  class RecipeImageUploadTests(TestCase):
      def setUp(self):
          self.client = APIClient()
          self.user = get_user_model().objects.create_user(
              'imagetest@nur.com',
              'pass@123'
          )
          self.client.force_authenticate(self.user)
          self.recipe = sample_recipe(user=self.user)
  
      def tearDown(self):
          self.recipe.image.delete()
  
      def test_upload_image_to_recipe(self):
          """Test upload an image to recipe"""
          url = image_upload_url(self.recipe.id)
          with tempfile.NamedTemporaryFile(suffix='.jpg') as ntf:
              img = Image.new('RGB', (10, 10))
              img.save(ntf, format='JPEG')
              ntf.seek(0)
              res = self.client.post(url, {'image': ntf}, format='multipart')
  
          self.recipe.refresh_from_db()
          self.assertEqual(res.status_code, status.HTTP_200_OK)
          self.assertIn('image', res.data)
          self.assertTrue(os.path.exists(self.recipe.image.path))
  
      def test_upload_image_bad_request(self):
          """Test uploading an invalid image"""
          url = image_upload_url(self.recipe.id)
          res = self.client.post(url, {'image': 'notimage'}, format="multipart")
  
          self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)
  
      def test_filter_recipe_by_tags(self):
          """Test returning recipes with specific tags"""
          recipe1 = sample_recipe(user=self.user, title='Thai vegetable curry')
          recipe2 = sample_recipe(user=self.user, title='Aubergine with tahini')
          tag1 = sample_tag(user=self.user, name='Vegan')
          tag2 = sample_tag(user=self.user, name='Vegetarian')
          recipe1.tags.add(tag1)
          recipe2.tags.add(tag2)
          recipe3 = sample_recipe(user=self.user, title='Fish and chips')
  
          res = self.client.get(
              RECIPES_URL,
              {'tags': f'{tag1.id},{tag2.id}'}
          )
  
          serializer1 = RecipeSerializer(recipe1)
          serializer2 = RecipeSerializer(recipe2)
          serializer3 = RecipeSerializer(recipe3)
  
          self.assertIn(serializer1.data, res.data)
          self.assertIn(serializer2.data, res.data)
          self.assertNotIn(serializer3, res.data)
  
      def test_filter_recipes_by_ingredients(self):
          """Test returning recipes with specific ingredients"""
          recipe1 = sample_recipe(user=self.user, title='Posh beans on toast')
          recipe2 = sample_recipe(user=self.user, title='Chicken cacciatore')
          ingredient1 = sample_ingredient(user=self.user, name='Feta cheese')
          ingredient2 = sample_ingredient(user=self.user, name='Chicken')
          recipe1.ingredients.add(ingredient1)
          recipe2.ingredients.add(ingredient2)
          recipe3 = sample_recipe(user=self.user, title='Steak and mushrooms')
  
          res = self.client.get(
              RECIPES_URL,
              {'ingredients': f'{ingredient1.id},{ingredient2.id}'}
          )
  
          serializer1 = RecipeSerializer(recipe1)
          serializer2 = RecipeSerializer(recipe2)
          serializer3 = RecipeSerializer(recipe3)
          self.assertIn(serializer1.data, res.data)
          self.assertIn(serializer2.data, res.data)
          self.assertNotIn(serializer3.data, res.data)
  