164 lines
5.5 KiB
Scheme
164 lines
5.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
|
||
;;;
|
||
;;; This file is part of GNU Guix.
|
||
;;;
|
||
;;; GNU Guix is free software; you can redistribute it and/or modify it
|
||
;;; under the terms of the GNU General Public License as published by
|
||
;;; the Free Software Foundation; either version 3 of the License, or (at
|
||
;;; your option) any later version.
|
||
;;;
|
||
;;; GNU Guix is distributed in the hope that it will be useful, but
|
||
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
;;; GNU General Public License for more details.
|
||
;;;
|
||
;;; You should have received a copy of the GNU General Public License
|
||
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
|
||
|
||
(define-module (test-monads)
|
||
#:use-module (guix store)
|
||
#:use-module (guix monads)
|
||
#:use-module (guix derivations)
|
||
#:use-module ((guix packages)
|
||
#:select (package-derivation %current-system))
|
||
#:use-module (gnu packages)
|
||
#:use-module (gnu packages bootstrap)
|
||
#:use-module (ice-9 match)
|
||
#:use-module (rnrs io ports)
|
||
#:use-module (srfi srfi-1)
|
||
#:use-module (srfi srfi-26)
|
||
#:use-module (srfi srfi-64))
|
||
|
||
;; Test the (guix store) module.
|
||
|
||
(define %store
|
||
(open-connection))
|
||
|
||
;; Make sure we build everything by ourselves.
|
||
(set-build-options %store #:use-substitutes? #f)
|
||
|
||
(define %monads
|
||
(list %identity-monad %store-monad))
|
||
|
||
(define %monad-run
|
||
(list identity
|
||
(cut run-with-store %store <>)))
|
||
|
||
|
||
(test-begin "monads")
|
||
|
||
;; The 3 "monad laws": <http://www.haskell.org/haskellwiki/Monad_laws>.
|
||
|
||
(test-assert "left identity"
|
||
(every (lambda (monad run)
|
||
(let ((number (random 777)))
|
||
(with-monad monad
|
||
(define (f x)
|
||
(return (* (1+ number) 2)))
|
||
|
||
(= (run (>>= (return number) f))
|
||
(run (f number))))))
|
||
%monads
|
||
%monad-run))
|
||
|
||
(test-assert "right identity"
|
||
(every (lambda (monad run)
|
||
(with-monad monad
|
||
(let ((number (return (random 777))))
|
||
(= (run (>>= number return))
|
||
(run number)))))
|
||
%monads
|
||
%monad-run))
|
||
|
||
(test-assert "associativity"
|
||
(every (lambda (monad run)
|
||
(with-monad monad
|
||
(define (f x)
|
||
(return (+ 1 x)))
|
||
(define (g x)
|
||
(return (* 2 x)))
|
||
|
||
(let ((number (return (random 777))))
|
||
(= (run (>>= (>>= number f) g))
|
||
(run (>>= number (lambda (x) (>>= (f x) g))))))))
|
||
%monads
|
||
%monad-run))
|
||
|
||
(test-assert "lift"
|
||
(every (lambda (monad run)
|
||
(let ((f (lift1 1+ monad)))
|
||
(with-monad monad
|
||
(let ((number (random 777)))
|
||
(= (run (>>= (return number) f))
|
||
(1+ number))))))
|
||
%monads
|
||
%monad-run))
|
||
|
||
(test-assert "mlet* + text-file + package-file"
|
||
(run-with-store %store
|
||
(mlet* %store-monad ((guile (package-file %bootstrap-guile "bin/guile"))
|
||
(file (text-file "monadic" guile)))
|
||
(return (equal? (call-with-input-file file get-string-all)
|
||
guile)))
|
||
#:guile-for-build (package-derivation %store %bootstrap-guile)))
|
||
|
||
(test-assert "mlet* + derivation-expression"
|
||
(run-with-store %store
|
||
(mlet* %store-monad ((guile (package-file %bootstrap-guile "bin/guile"))
|
||
(gdrv (package->derivation %bootstrap-guile))
|
||
(exp -> `(let ((out (assoc-ref %outputs "out")))
|
||
(mkdir out)
|
||
(symlink ,guile
|
||
(string-append out "/guile-rocks"))))
|
||
(drv (derivation-expression "rocks" (%current-system)
|
||
exp `(("g" ,gdrv))))
|
||
(out -> (derivation->output-path drv))
|
||
(built? (built-derivations (list drv))))
|
||
(return (and built?
|
||
(equal? guile
|
||
(readlink (string-append out "/guile-rocks"))))))
|
||
#:guile-for-build (package-derivation %store %bootstrap-guile)))
|
||
|
||
(test-assert "mapm"
|
||
(every (lambda (monad run)
|
||
(with-monad monad
|
||
(equal? (run (mapm monad (lift1 1+ monad) (map return (iota 10))))
|
||
(map 1+ (iota 10)))))
|
||
%monads
|
||
%monad-run))
|
||
|
||
(test-assert "sequence"
|
||
(every (lambda (monad run)
|
||
(let* ((input (iota 100))
|
||
(order '()))
|
||
(define (frob i)
|
||
;; The side effect here is used to keep track of the order in
|
||
;; which monadic values are bound.
|
||
(set! order (cons i order))
|
||
i)
|
||
|
||
(and (equal? input
|
||
(run (sequence monad
|
||
(map (lift1 frob monad) input))))
|
||
|
||
;; Make sure this is from left to right.
|
||
(equal? order (reverse input)))))
|
||
%monads
|
||
%monad-run))
|
||
|
||
(test-assert "listm"
|
||
(every (lambda (monad run)
|
||
(run (with-monad monad
|
||
(let ((lst (listm monad
|
||
(return 1) (return 2) (return 3))))
|
||
(mlet monad ((lst lst))
|
||
(return (equal? '(1 2 3) lst)))))))
|
||
%monads
|
||
%monad-run))
|
||
|
||
(test-end "monads")
|
||
|
||
|
||
(exit (= (test-runner-fail-count (test-runner-current)) 0))
|