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 users 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": "testpass123",
              "name": "Test Name",
          }
          response = self.client.post(CREATE_USER_URL, payload)
          self.assertEqual(response.status_code, status.HTTP_201_CREATED)
  
          user = get_user_model().objects.get(**response.data)
          self.assertTrue(user.check_password(payload["password"]))
          self.assertNotIn("password", response.data)
  
      def test_user_exists(self):
          """Test creating a user that already exists fails"""
          payload = {
              "name": "Test User",
              "email": "test@email.com",
              "password": "testpass123",
          }
          create_user(**payload)
          response = self.client.post(CREATE_USER_URL, payload)
  
          self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
  
      def test_password_too_short(self):
          """Test that the password must be more than 5 characters"""
          payload = {
              "name": "Test User",
              "email": "test@email.com",
              "password": "pass",
          }
          response = self.client.post(CREATE_USER_URL, payload)
  
          self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
          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 = {
              "name": "Test User",
              "email": "test@email.com",
              "password": "testpass",
          }
          create_user(**payload)
          response = self.client.post(TOKEN_URL, payload)
  
          self.assertIn("token", response.data)
          self.assertEqual(response.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="testpass",
          )
  
          payload = {
              "email": "test@example.com",
              "password": "wrongpass",
          }
          response = self.client.post(TOKEN_URL, payload)
  
          self.assertNotIn("token", response.data)
          self.assertEqual(response.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@example.com",
              "password": "testpass",
          }
          response = self.client.post(TOKEN_URL, payload)
  
          self.assertNotIn("token", response.data)
          self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
  
      def test_create_token_missing_field(self):
          """Test that email and password are required"""
  
          response = self.client.post(
              TOKEN_URL,
              {
                  "email": "test@example.com",
                  "password": "",
              },
          )
  
          self.assertNotIn("token", response.data)
          self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
  
      def test_retrieve_user_unauthorized(self):
          """Test that authentication is required for users"""
  
          response = self.client.get(ME_URL)
  
          self.assertEqual(response.status_code, status.HTTP_401_UNAUTHORIZED)
  
  
  class PrivateUserApiTests(TestCase):
      """Test API requests that require authentication"""
  
      def setUp(self):
          self.user = create_user(
              email="test@example.com",
              password="testpassword123",
              name="Test User",
          )
          self.client = APIClient()
          self.client.force_authenticate(user=self.user)
  
      def test_retrieve_profile_success(self):
          """Test retrieveing profile for logged in user"""
          response = self.client.get(ME_URL)
  
          self.assertEqual(response.status_code, status.HTTP_200_OK)
          self.assertEqual(
              response.data,
              {
                  "name": self.user.name,
                  "email": self.user.email,
              },
          )
  
      def test_post_me_not_allowed(self):
          """Test that POST is not allowed on the me 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 authentated user"""
          payload = {
              "name": "New name",
              "password": "newpassword123",
          }
          response = 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(response.status_code, status.HTTP_200_OK)
  