ClojureCheck /

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ClojureCheck – Property based testing for Clojure

ClojureCheck is an addon for clojure.test. It adds property based testing to clojure.test following the lines of [QuickCheck][qc] for Haskell.

Properties

Testing with ClojureCheck is done via so-called properties. A property consists of a set of bindings, which vary between trials, and „normal“ clojure.test assertions. The assertions are run several times. Each time the defined locals are bound to new values generated automatically by ClojureCheck.

Example

(ns my.package
  (:use clojure.test)
  (:require [clojurecheck.core :as cc]))

(defn angular-diff
  [a b]
  (-> (- a b) (mod 180) Math/abs))

(deftest angular-diff-standard-test
  (are [x y] (= x y)
    (angular-diff   0   0) 0
    (angular-diff  90  90) 0
    (angular-diff   0  45) 45
    (angular-diff  45   0) 45
    (angular-diff   0 270) 90
    (angular-diff (* 360 2) (+ (* 360 4) 23)) 23))

(deftest angular-diff-property
  (cc/property "angular-diff is smallest angel between a and b"
    [diff (cc/float :lower -180.0 :upper 180.0)
     a    (cc/float :lower 0.0 :upper 360.0)
     n    (cc/int)]
    (let [b (+ a (* 360 n) diff)]
      (is (= (angular-diff a b) (Math/abs diff))))))

Installation

To use ClojureCheck add it to your project dependencies. lein, maven, gradle or ivy can then fetch it from clojars.

For lein:

:dev-dependencies [[clojurecheck 1.0.0]]

For gradle:

dependencies { testCompile 'clojurecheck:clojurecheck:1.0.0' }

Contact

I always appreciate feedback. Please report bugs on the tracker at bitbucket: http://bitbucket.org/kotarak/clojurecheck/issues. Also improvement ideas etc. are always welcome!

Meikel Brandmeyer mb@kotka.de Erlensee, Germany, 2010

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