Testing in Clojure

Clojure already comes with a unit testing support built-in, as a matter of fact Leiningen has already created a test for us; let's take a look at it right now.

Open the test/ns_playground/core_test.clj file, you should be able to see this code:

(ns ns-playground.core-test
  (:require [clojure.test :refer :all]
            [ns-playground.core :refer :all]))
(deftest a-test
  (testing "FIXME, I fail."
(is (= 0 1))))

Again, as you can see, we are using :require to include functions from the clojure.test and the ns-playground.core packages.

Note

Remember, the :refer :all works similar to how char import static clojure.test.* will work in Java.

Testing from the command line

Let's first learn how to run these tests. From the command line, you can run:

lein test

You should get the following output:

lein test ns-playground.core-test

lein test :only ns-playground.core-test/a-test

FAIL in (a-test) (core_test.clj:7)
FIXME, I fail.
expected: (= 0 1)
  actual: (not (= 0 1))

Ran 1 tests containing...