with-redefs not replacing valid Compojure route function call in clojure.test

I want to test my Compojure endpoints and see that the required method is called. However, with-redefs-fn is not replacing the method.

Test method-

(ns project-name.handler-test
  (:require [clojure.test :refer :all]
        [project-name.handler :as handler :refer [retrieve-records test-handler]]
        [ring.mock.request :as mock]))

(deftest fn-handler-routes
  (with-redefs-fn {#'handler/retrieve-records (fn [arg] :test)} 
    (let [response {:status 200 :body :test}] 
    (let [mock-handler (test-handler)]
    (is (= response (mock-handler (mock/request :get "/records/name"))))))))

I am guessing routes are static, and thus the method fires and returns actual data instead of calling the redefined function. test-handler is a failing attempt to try to circumvent -- it fires okay, but does not use with-redefs and returns repo data.

Pertinent Source Code-

(defn retrieve-records [arg] (repo/get-records arg))

(defroutes routes
  (GET "/" [] (resource-response "index.html" {:root "public"}))
  (context "/records" []
    (GET "/name" [] (retrieve-records :lastname)))
  (resources "/"))

(defn test-handler []
  (-> #'routes wrap-reload))

Related Issues

I suspect a similar underlying issue as this SO question about Midje but I am using clojure.test and not midje.

This question is different from a very similar SO question in that the Compojure route is legitimate and I want to return something in the :body, not just test the status (already tried that answer).

This question is different from an integration test question in that it is a handler unit test, though probably the same underlying issue.

Any help would be greatly appreciated.