Add support for HttpResponse.text

[cuu508]

Django 5.2 added the HttpResponse.text field.

This field would be handy to use in tests, but _MonkeyPatchedWSGIResponse does not yet know about it.

I wanted to make a quick PR adding support for it, but ended up a little over my head :-)

I added the text field to the HttpResponse stub:

--- a/django-stubs/http/response.pyi
+++ b/django-stubs/http/response.pyi
@@ -6,6 +6,7 @@ from json import JSONEncoder
 from typing import Any, Literal, TypeVar, overload, type_check_only
 
 from django.utils.datastructures import CaseInsensitiveMapping, _PropertyDescriptor
+from django.utils.functional import cached_property
 
 class BadHeaderError(ValueError): ...
 
@@ -102,6 +103,8 @@ class HttpResponse(HttpResponseBase, Iterable[bytes]):
     __bytes__ = serialize
     def __iter__(self) -> Iterator[bytes]: ...
     def getvalue(self) -> bytes: ...
+    @cached_property
+    def text(self) -> str: ...

However, _MonkeyPatchedWSGIResponse inherits from HttpResponseBase not from HttpResponse, and so if I access it in tests, I get type errors.

I think this is a similar situation as in #968 –

• The easy fix would be to add text to the _MonkeyPatchedWSGIResponse as well. Doing so would not be quite correct though, as HttpResponseBase subclasses other than HttpResponse should not have the text field.
• Same as in Support content attribute for a Testing Response. #968, the alternative would be to have multiple variants of _MonkeyPatchedWSGIResponse, and in tests assert which specific variant we expect. This would be more correct but more clumsy.

I'm not sure how to proceed here.

[cuu508]

I created a PR for the "easy fix" option here: #2622