Decoupled test client encoding tests from JSON handling

Using JSON as non-UTF-8 content is controversial, and the RFC 7159
discourages it.
Thanks Tim Graham for the review.

tests/test_client_regress/tests.py

@@ -1268,35 +1268,32 @@ class QueryStringTests(SimpleTestCase):
 
 
 @override_settings(ROOT_URLCONF='test_client_regress.urls')
-class UnicodePayloadTests(SimpleTestCase):
-
-    def test_simple_unicode_payload(self):
-        "A simple ASCII-only JSON document can be POSTed"
-        # Regression test for #10571
-        json_str = '{"english": "mountain pass"}'
-        response = self.client.post("/parse_unicode_json/", json_str, content_type="application/json")
-        self.assertEqual(response.content, json_str.encode())
-
-    def test_unicode_payload_utf8(self):
-        "A non-ASCII unicode data encoded as UTF-8 can be POSTed"
-        # Regression test for #10571
-        json_str = '{"dog": "собака"}'
-        response = self.client.post("/parse_unicode_json/", json_str, content_type="application/json; charset=utf-8")
-        self.assertEqual(response.content, json_str.encode())
-
-    def test_unicode_payload_utf16(self):
-        "A non-ASCII unicode data encoded as UTF-16 can be POSTed"
-        # Regression test for #10571
-        json_str = '{"dog": "собака"}'
-        response = self.client.post("/parse_unicode_json/", json_str, content_type="application/json; charset=utf-16")
-        self.assertEqual(response.content, json_str.encode('utf-16'))
-
-    def test_unicode_payload_non_utf(self):
-        "A non-ASCII unicode data as a non-UTF based encoding can be POSTed"
-        # Regression test for #10571
-        json_str = '{"dog": "собака"}'
-        response = self.client.post("/parse_unicode_json/", json_str, content_type="application/json; charset=koi8-r")
-        self.assertEqual(response.content, json_str.encode('koi8-r'))
+class PayloadEncodingTests(SimpleTestCase):
+    """Regression tests for #10571."""
+
+    def test_simple_payload(self):
+        """A simple ASCII-only text can be POSTed."""
+        text = 'English: mountain pass'
+        response = self.client.post('/parse_encoded_text/', text, content_type='text/plain')
+        self.assertEqual(response.content, text.encode())
+
+    def test_utf8_payload(self):
+        """Non-ASCII data encoded as UTF-8 can be POSTed."""
+        text = 'dog: собака'
+        response = self.client.post('/parse_encoded_text/', text, content_type='text/plain; charset=utf-8')
+        self.assertEqual(response.content, text.encode())
+
+    def test_utf16_payload(self):
+        """Non-ASCII data encoded as UTF-16 can be POSTed."""
+        text = 'dog: собака'
+        response = self.client.post('/parse_encoded_text/', text, content_type='text/plain; charset=utf-16')
+        self.assertEqual(response.content, text.encode('utf-16'))
+
+    def test_non_utf_payload(self):
+        """Non-ASCII data as a non-UTF based encoding can be POSTed."""
+        text = 'dog: собака'
+        response = self.client.post('/parse_encoded_text/', text, content_type='text/plain; charset=koi8-r')
+        self.assertEqual(response.content, text.encode('koi8-r'))
 
 
 class DummyFile:

tests/test_client_regress/urls.py

@@ -31,7 +31,7 @@ urlpatterns = [
     url(r'^check_unicode/$', views.return_unicode),
     url(r'^check_binary/$', views.return_undecodable_binary),
     url(r'^json_response/$', views.return_json_response),
-    url(r'^parse_unicode_json/$', views.return_json_file),
+    url(r'^parse_encoded_text/$', views.return_text_file),
     url(r'^check_headers/$', views.check_headers),
     url(r'^check_headers_redirect/$', RedirectView.as_view(url='/check_headers/')),
     url(r'^body/$', views.body),

tests/test_client_regress/views.py

-import json
 from urllib.parse import urlencode
 
 from django.conf import settings
 from django.contrib.auth.decorators import login_required
-from django.core.serializers.json import DjangoJSONEncoder
 from django.http import HttpResponse, HttpResponseRedirect, JsonResponse
 from django.shortcuts import render
 from django.template.loader import render_to_string
@@ -111,20 +109,15 @@ def return_json_response(request):
     return JsonResponse({'key': 'value'}, **kwargs)
 
 
-def return_json_file(request):
-    "A view that parses and returns a JSON string as a file."
+def return_text_file(request):
+    "A view that parses and returns text as a file."
     match = CONTENT_TYPE_RE.match(request.META['CONTENT_TYPE'])
     if match:
         charset = match.group(1)
     else:
         charset = settings.DEFAULT_CHARSET
 
-    # This just checks that the uploaded data is JSON
-    obj_dict = json.loads(request.body.decode(charset))
-    obj_json = json.dumps(obj_dict, cls=DjangoJSONEncoder, ensure_ascii=False)
-    response = HttpResponse(obj_json.encode(charset), status=200,
-                            content_type='application/json; charset=%s' % charset)
-    response['Content-Disposition'] = 'attachment; filename=testfile.json'
+    response = HttpResponse(request.body, status=200, content_type='text/plain; charset=%s' % charset)
     return response