Writing the tests

Now that you have written your image processing code, it is a good time to write the tests.

Let's just check if we can generate a thumbnail. Create a new thumbnails.thumbnail-test namespace, in the tests.

Remember, if you create the file, it must be named test/thumbnails/thumbnail_test.clj.

Add the following contents to it:

(ns thumbnails.thumbnail-test
  (:require [clojure.test :refer :all]
            [clojure.java.io :as io]
            [thumbnails.image :refer :all]))

(deftest test-image-width
  (testing "We should be able to get the image with"
    (let [image-stream (io/input-stream "http://imgs.xkcd.com/comics/angular_momentum.jpg")
          image (load-image image-stream)]
      (save-image image "xkcd-width.png")
      (is (= 600 (get-image-width (io/input-stream "xkcd-width.png")))))))

(deftest test-load-image
  (testing "We should be able to generate thumbnails"
    (let [image-stream (io/input-stream "http://imgs.xkcd.com/comics/angular_momentum.jpg")
      ...