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#!/usr/bin/guile \
-s
!#
(add-to-load-path (dirname (dirname (current-filename))))
(use-modules (srfi srfi-64))
(use-modules (monad)
(monad optional))
(define (div d)
(if (zero? d)
(nothing)
(just (/ 1 d))))
(test-begin "mapM-test")
(test-assert (equal? (mapM div '(1 2 3))
(just '(1 1/2 1/3))))
(test-assert (equal? (mapM div (map just '(1 2 3)))
(just '(1 1/2 1/3))))
;;; --------------------------------------------------
(test-assert (equal? (mapM div '(0 1 2 3))
(nothing)))
(test-assert (equal? (mapM div (map just '(0 1 2 3)))
(nothing)))
(test-end "mapM-test")
(test-begin "state-test")
(use-modules (monad state)
(monad stack))
(test-equal (run-state (return-state 10) 20)
'(10 20))
(test-equal
(car
(run-state
(do let y = 7
(modify (lambda (x) (+ x y)))
(get))
10))
17)
(test-end "state-test")
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