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+;;; 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-ui)
+ #:use-module (guix ui)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-64))
+
+;; Test the (guix ui) module.
+
+(define %paragraph
+ "GNU Guile is an implementation of the Scheme programming language, with
+support for many SRFIs, packaged for use in a wide variety of environments.
+In addition to implementing the R5RS Scheme standard and a large subset of
+R6RS, Guile includes a module system, full access to POSIX system calls,
+networking support, multiple threads, dynamic linking, a foreign function call
+interface, and powerful string processing.")
+
+
+(test-begin "ui")
+
+(test-assert "fill-paragraph"
+ (every (lambda (column)
+ (every (lambda (width)
+ (every (lambda (line)
+ (<= (string-length line) width))
+ (string-split (fill-paragraph %paragraph
+ width column)
+ #\newline)))
+ '(15 30 35 40 45 50 60 70 80 90 100)))
+ '(0 5)))
+
+(test-assert "fill-paragraph, consecutive newlines"
+ (every (lambda (width)
+ (any (lambda (line)
+ (string-prefix? "When STR" line))
+ (string-split
+ (fill-paragraph (procedure-documentation fill-paragraph)
+ width)
+ #\newline)))
+ '(15 20 25 30 40 50 60)))
+
+(test-equal "fill-paragraph, large unbreakable word"
+ '("Here is a" "very-very-long-word"
+ "and that's" "it.")
+ (string-split
+ (fill-paragraph "Here is a very-very-long-word and that's it."
+ 10)
+ #\newline))
+
+(test-end "ui")
+
+
+(exit (= (test-runner-fail-count (test-runner-current)) 0))