How to perform integration testing in Clojure?

Question

What are the methods and libraries for testing integration in Clojure. In particular, interaction with databases, ring applications, core.async channels, all that causes a side effect.

Answer 1

You can use ring-mock for ring applications. An example of creating a handler layout and its use:

(let [h (-> (POST "/some/url" [] some-resource)
            (wrap-defaults api-defaults))]
  (let [resp (h (-> (request :post "/some/url")
                    (header "content-type" "application/json")
                    (body (generate-string {:foo :bar}))))]
    (is (= 303 (:status resp)))
    (is (= "" (:body resp)))
    (is (= "http://some/place/foo" (get-in resp [:headers "Location"])))))

d/b with-redefs, , . , , , , .

(testing "some d/b work"
  (let [insert-data (ref {})]
    (with-redefs
      [d/insert-data<! 
       (fn [db data] (dosync (alter insert-data assoc :db db)
                             (alter insert-data assoc :data data)))]
      (let [d (your-fn your-args)]
        (is (= {:some :expected-result} d))
        (is (= {:db {:some :connection-data} :data {:some :expected-data}} @insert-data))))))

, refs, , , .

, , clojure.test, test.check. Midje , , clojure.test , . , cljs, .

core.async, .