How do I mock a PUT request using ring.mock.request - clojure

Question

How do I make this test pass:
(ns imp-rest.parser-test-rest
(:require [clojure.test :refer :all])
(:require [ring.mock.request :as mock] )
(:require [imp-rest.web :as w]))
(deftest test-parser-rest
(testing "put settings"
(w/app
(mock/request :put "/settings/coordinateName" "FOO" ))
(let [response (w/app (mock/request :get "/settings"))]
(println response )
(is (= (get (:body response) :coordinateName) "FOO")))))
it fails with:
FAIL in (test-parser-rest) (parser_test_rest.clj:30)
put settings
expected: (= (get (:body response) :coordinateName) "FOO")
actual: (not (= nil "FOO"))
Here's my handler:
(ns imp-rest.web
(:use compojure.core)
(:use ring.middleware.json-params)
(:require [clj-json.core :as json])
(:require [ring.util.response :as response])
(:require [compojure.route :as route])
(:require [imp-rest.settings :as s]))
(defn json-response [data & [status]]
{:status (or status 200)
:headers {"Content-Type" "application/json"}
:body (json/generate-string data)})
(defroutes handler
(GET "/settings" []
(json-response (s/get-settings)))
(GET "/settings/:id" [id]
(json-response (s/get-setting id)))
(PUT "/settings" [id value]
(json-response (s/put-setting id value)))
(route/not-found "Page not found") )
(def app
(-> handler
wrap-json-params))
which exposes this map (of settings):
(ns imp-rest.settings)
(def settings
(atom
{:coordinateName nil
:burnin nil
:nslices nil
:mrsd nil
}))
(defn get-settings []
#settings)
(defn get-setting [id]
(#settings (keyword id)))
(defn put-setting [id value]
(swap! settings assoc (keyword id) value)
value)
and the entry point:
(ns imp-rest.core
(:use ring.adapter.jetty)
(:require [imp-rest.web :as web]))
(defn -main
"Entry point"
[& args]
(do
(run-jetty #'web/app {:port 8080})
);END;do
);END: main
Now when I 'lein run' I can make a (working) request like this:
curl -X PUT -H "Content-Type: application/json" \
-d '{"id" : "coordinateName", "value" : "FOO"}' \
http://localhost:8080/settings
which is what I try to mock with the test. Any help appreciated.

Answer 1

If you want to have :id in your PUT /settings/:id route accepting body in format {"value": "..."}, you need to change your routes definition:
(defroutes handler
(GET "/settings" []
(json-response (s/get-settings)))
(GET "/settings/:id" [id]
(json-response (s/get-setting id)))
(PUT "/settings/:id" [id value]
(json-response (s/put-setting id value)))
(route/not-found "Page not found"))
And change how you call your PUT endpoint in the test:
(w/app
(-> (mock/request
:put
"/settings/coordinateName"
(json/generate-string {:value "FOO"}))
(mock/content-type "application/json")))
What was changed?
:id in your PUT URL route definition (/settings -> /settings/:id)
Your PUT request didn't send a correct request and content type.
If you want to have a PUT /settings route expecting {"id": "...", "value": "..."} request body, then you need to change how you create a mock request:
(w/app
(-> (mock/request
:put
"/settings"
(json/generate-string {:id "coordinateName" :value "FOO"}))
(mock/content-type "application/json"))

Answer 2

Your curl request specifies the parameters as JSON in the body of the PUT request, but your mock request tries to use URL parameters.
There are two options to resolve this:
compojure can automatically translate parameters, but only when the relevant middleware is present -- you have wrap-json-params added to your handler, but you're missing wrap-params. The answer from Piotrek Bzdyl amounts to making these params explicit in the compojure routes.
Alternatively, you can add the ID/value pair as JSON in the body of the mock request using request.mock.body.