Function call verification for use with clojure.test
Add the following dependency to your project.clj file:
(ns my-tests
(:require [clojure.test :refer :all]
[wedge.core :refer :all]))
(defn assert-some-param [param]
(assert (integer? param) "param needs to be an integer"))
(defn helper-fn [amount param]
(+ amount param))
(defn main-fn [param]
(assert-some-param param)
(if (odd? (helper-fn 1 param))
(* param param)
(dec param)))
(deftest main-fn-tests
(with-wedge [assert-some-param assert-counter
helper-fn helper-counter]
(is (= 9 (main-fn 2)))
;; was assert-some-param called at all?
(is (called? assert-counter))
(is (= 1 (main-fn 1)))
;; count the total number of times helper-fn was called
(is (= 2 (total-calls helper-counter)))
;; count the total number of times helper-fn was call with '1' for both arguments
(is (= 1 (call-count helper-counter [1 1])))
;; count the total number of times helper-fn was call with '1' for the first argument
(is (= 2 (call-count helper-counter [1 ?])))
;; count the total number of times helper-fn was call with '1' for the first argument
;; and any second argument greater than 0
(is (= 2 (call-count helper-counter [1 [? #(< 0 %)]])))))
Often times our code is composed of fns for which there are already tests. Assertions, validations, helper functions, etc. When writing a test for a top level fn, or a fn composed of other fns for which their are already tests, we don't want to attempt to test the logic in the helper fns, we simply want to verify that the helper fn is called. The helper fn test is responsible for verifying the helper fn, not the test we are currently writing.
To this end, wedge. Hopefuly most of the time called? is sufficient for a majority of needs, but there is some flexibility added in case you need to
test a range of parameters, such as Moq, or some similar library.
Copyright © 2015 Chris LaVoie
Distributed under the Eclipse Public License, the same as Clojure.
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