stdlib wsgiref requires argument for read()

[suola]

PEP3333 says:

A server should allow read() to be called without an argument, and
return the remainder of the client's input stream.

However, Python standard library wsgiref does not allow calling read
without arguments. Falcon test client falcon.testing.TestClient uses
wsgiref - therefore content length should be passed an argument to
read.

[suola]

Short example on how to reproduce:

import falcon
import falcon.testing
import webargs
from webargs.falconparser import use_kwargs
from marshmallow import Schema


class MySchema(Schema):
    name = webargs.fields.Str()


class Resource:
    @use_kwargs(MySchema)
    def on_post(self, req, resp):
        pass


api = falcon.API()
api.add_route("/", Resource())
client = falcon.testing.TestClient(api)
resp = client.simulate_post("/", json={"name": "richard feynman"})

[lafrech]

I think you're right.

Could you please add a test for this?

And add yourself to AUTHORS file.

Thanks.

[suola]

Added a test, please let me know if it's ok for webargs and/or if the patch needs anything else.

[lafrech]

I don't think testapp is needed, here. Is it?

[suola]

You're right, it's not - updated.

[lafrech]

Thanks.