Fixed #29082 -- Allowed the test client to encode JSON request data.

tests/test_client/tests.py

@@ -21,6 +21,7 @@ rather than the HTML rendered to the end-user.
 """
 import itertools
 import tempfile
+from unittest import mock
 
 from django.contrib.auth.models import User
 from django.core import mail
@@ -86,6 +87,31 @@ class ClientTest(TestCase):
         self.assertEqual(response.templates[0].name, 'POST Template')
         self.assertContains(response, 'Data received')
 
+    def test_json_serialization(self):
+        """The test client serializes JSON data."""
+        methods = ('post', 'put', 'patch', 'delete')
+        for method in methods:
+            with self.subTest(method=method):
+                client_method = getattr(self.client, method)
+                method_name = method.upper()
+                response = client_method('/json_view/', {'value': 37}, content_type='application/json')
+                self.assertEqual(response.status_code, 200)
+                self.assertEqual(response.context['data'], 37)
+                self.assertContains(response, 'Viewing %s page.' % method_name)
+
+    def test_json_encoder_argument(self):
+        """The test Client accepts a json_encoder."""
+        mock_encoder = mock.MagicMock()
+        mock_encoding = mock.MagicMock()
+        mock_encoder.return_value = mock_encoding
+        mock_encoding.encode.return_value = '{"value": 37}'
+
+        client = self.client_class(json_encoder=mock_encoder)
+        # Vendored tree JSON content types are accepted.
+        client.post('/json_view/', {'value': 37}, content_type='application/vnd.api+json')
+        self.assertTrue(mock_encoder.called)
+        self.assertTrue(mock_encoding.encode.called)
+
     def test_trace(self):
         """TRACE a view"""
         response = self.client.trace('/trace_view/')