Test a Falcon WSGI app directly using httpx

example.py

import falcon
import httpx


class TestResource:
    def on_get(self, req, resp):
        raise falcon.HTTPTooManyRequests()


def test_a_thing():
    app = falcon.App()
    app.add_route('/', TestResource())

    with httpx.Client(app=app, base_url='http://testserver') as client:
        r = client.get('/')
        assert r.status_code == 429