text: from django.test import TestCase
  from django.contrib.auth import get_user_model
  from django.urls import reverse
  
  from rest_framework.test import APIClient
  from rest_framework import status
  
  
  CREATE_USER_URL = reverse('user:create')
  TOKEN_URL = reverse('user:token')
  ME_URL = reverse('user:me')
  
  
  def create_user(**params):
      return get_user_model().objects.create_user(**params)
  
  
  class PublicUserApiTests(TestCase):
      """Test the user API (public)"""
  
      def setUp(self):
          self.client = APIClient()
  
      def test_create_valid_user_success(self):
          """Test creating user with valid payload is successful"""
          payload = {
              'email': 'test@email.com',
              'password': 'testpass',
              'name': 'Test name'
          }
          res = self.client.post(CREATE_USER_URL, payload)
  
          self.assertEqual(res.status_code, status.HTTP_201_CREATED)
          user = get_user_model().objects.get(**res.data)
          self.assertTrue(user.check_password(payload['password']))
          self.assertNotIn('password', res.data)
  
      def test_user_exists(self):
          """Test creating a user that already exists fails"""
          payload = {
              'email': 'test@email.com',
              'password': 'testpass',
              'name': 'Test name'
          }
          create_user(**payload)
  
          res = self.client.post(CREATE_USER_URL, payload)
  
          self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)
  
      def test_password_too_short(self):
          """Test that the password must be more than 5 characters"""
          payload = {
              'email': 'test@email.com',
              'password': 'pw',
              'name': 'Test name'
          }
          res = self.client.post(CREATE_USER_URL, payload)
  
          self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)
          # The user should have not been created
          user_exists = get_user_model().objects.filter(
              email=payload['email']
          ).exists()
          self.assertFalse(user_exists)
  
      def test_create_token_for_user(self):
          """"Test that a token is created for the user"""
          payload = {'email': 'test@email.com', 'password': 'testpass'}
          create_user(**payload)
          res = self.client.post(TOKEN_URL, payload)
  
          self.assertIn('token', res.data)
          self.assertEqual(res.status_code, status.HTTP_200_OK)
  
      def test_create_token_invalid_credentials(self):
          """Test that token is not created if invalid credentials are given"""
          create_user(email='test@email.com', password='correct_password')
          payload = {'email': 'test@email.com', 'password': 'incorrect_password'}
          res = self.client.post(TOKEN_URL, payload)
  
          self.assertNotIn('token', res.data)
          self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)
  
      def test_create_token_no_user(self):
          """Test that token is not created if user doesn't exist"""
          payload = {'email': 'test@email.com', 'password': 'testpass'}
          res = self.client.post(TOKEN_URL, payload)
  
          self.assertNotIn('token', res.data)
          self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)
  
      def test_create_token_missing_field(self):
          """Test that email and pasword are required"""
          res = self.client.post(TOKEN_URL, {'email': 'one', 'password': ''})
          self.assertNotIn('token', res.data)
          self.assertEqual(res.status_code, status.HTTP_400_BAD_REQUEST)
  
      def test_retrieve_user_unauthorized(self):
          """Test that authentication is required for users"""
          res = self.client.get(ME_URL)
  
          self.assertEqual(res.status_code, status.HTTP_401_UNAUTHORIZED)
  
  
  class PrivateUserApiTests(TestCase):
      """Test API requests that require authentication"""
  
      def setUp(self):
          self.user = create_user(
              email='test@londonappdev.com',
              password='testpass',
              name='Name'
          )
          self.client = APIClient()
          self.client.force_authenticate(user=self.user)
  
      def test_retrieve_profile_success(self):
          """Test retrieving profile for logged in user"""
          res = self.client.get(ME_URL)
          self.assertEqual(res.status_code, status.HTTP_200_OK)
          self.assertEqual(res.data, {
              'email': self.user.email,
              'name': self.user.name,
          })
  
      def test_post_me_not_allowed(self):
          """Test that POST is not allowed on the same URL"""
          res = self.client.post(ME_URL, {})
  
          self.assertEqual(res.status_code, status.HTTP_405_METHOD_NOT_ALLOWED)
  
      def test_update_user_profile(self):
          """Test updating the user profile for authenticated user"""
          payload = {'name': 'new name', 'password': 'newpassword123'}
  
          res = self.client.patch(ME_URL, payload)
  
          self.user.refresh_from_db()
          self.assertEqual(self.user.name, payload['name'])
          self.assertTrue(self.user.check_password(payload['password']))
          self.assertEqual(res.status_code, status.HTTP_200_OK)
  