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;; Test routines for monads.clj
;; by Konrad Hinsen
;; last updated March 19, 2009
;; Copyright (c) Konrad Hinsen, 2008. All rights reserved. The use
;; and distribution terms for this software are covered by the Eclipse
;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
;; which can be found in the file epl-v10.html at the root of this
;; distribution. By using this software in any fashion, you are
;; agreeing to be bound by the terms of this license. You must not
;; remove this notice, or any other, from this software.
(ns clojure.contrib.test-contrib.monads
(:use [clojure.contrib.test-is :only (deftest are run-tests)]
[clojure.contrib.monads
:only (with-monad domonad m-lift m-seq m-chain
sequence-m maybe-m maybe-t)]))
(deftest sequence-monad
(with-monad sequence-m
(are (= _1 _2)
(domonad [x (range 3) y (range 2)] (+ x y))
'(0 1 1 2 2 3)
(domonad [x (range 5) y (range (+ 1 x)) :when (= (+ x y) 2)] (list x y))
'((1 1) (2 0))
((m-lift 2 #(list %1 %2)) (range 3) (range 2))
'((0 0) (0 1) (1 0) (1 1) (2 0) (2 1))
(m-seq (replicate 3 (range 2)))
'((0 0 0) (0 0 1) (0 1 0) (0 1 1) (1 0 0) (1 0 1) (1 1 0) (1 1 1))
((m-chain (replicate 3 range)) 5)
'(0 0 0 1 0 0 1 0 1 2)
(m-plus (range 3) (range 2))
'(0 1 2 0 1))))
(deftest maybe-monad
(with-monad maybe-m
(let [m+ (m-lift 2 +)
mdiv (fn [x y] (domonad [a x b y :when (not (zero? b))] (/ a b)))]
(are (= _1 _2)
(m+ (m-result 1) (m-result 3))
(m-result 4)
(mdiv (m-result 1) (m-result 3))
(m-result (/ 1 3))
(m+ 1 (mdiv (m-result 1) (m-result 0)))
m-zero
(m-plus m-zero (m-result 1) m-zero (m-result 2))
(m-result 1)))))
(deftest seq-maybe-monad
(with-monad (maybe-t sequence-m)
(letfn [(pairs [xs] ((m-lift 2 #(list %1 %2)) xs xs))]
(are (= _1 _2)
((m-lift 1 inc) (for [n (range 10)] (when (odd? n) n)))
'(nil 2 nil 4 nil 6 nil 8 nil 10)
(pairs (for [n (range 5)] (when (odd? n) n)))
'(nil nil (1 1) nil (1 3) nil nil nil (3 1) nil (3 3) nil nil)))))
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