Failing test describing how interaction with middleware like wrap-params results in unexpected entries in the route-params map

bidi_test.clj

(ns bidi.bidi-test
  (:require [clojure.test :refer :all]
            [bidi.bidi :refer :all]
            [ring.mock.request :refer :all]))

(deftest route-params-hygiene-test
  (testing "other request constraints"
    (let [handler
          (make-handler [["/blog/user/" :userid "/article"]
                         (fn [req] {:status 201 :body (:route-params req)})])]

      (is handler)
      (testing "specified params like userid make it into :route-params
                but other params do not"
        (is (= (handler (-> (request :put "/blog/user/8888/article")
                            (assoc :params {"foo" "bar"})))
               {:status 201 :body {:userid "8888"}}))))))