How do you test Django REST Framework APIs (APIClient, status codes, serializer validation)? Django REST Framework API को कैसे टेस्ट करें (APIClient, स्टेटस कोड, सीरियलाइज़र वैलिडेशन)?

DRF provides rest_framework.test.APIClient, a subclass of Django's test client tailored for APIs — it handles JSON request/response bodies naturally, supports authentication helpers like force_authenticate() to bypass real login for a test, and returns a response whose .data attribute gives the parsed response content directly.

A thorough DRF test suite checks status codes for each scenario (200/201 for success, 400 for validation errors, 401/403 for auth failures, 404 for missing resources), verifies the exact shape of the returned JSON, and separately unit-tests serializers by instantiating them directly with sample data to confirm validation rules work in isolation from any view or HTTP layer.

from rest_framework.test import APITestCase
from rest_framework import status

class ProductAPITest(APITestCase):
    def test_create_product_invalid_price(self):
        response = self.client.post('/api/products/', {'name': 'Book', 'price': -10})
        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
        self.assertIn('price', response.data)