putenv tests (was: native Win32 guile 1.7.0)

[Kevin Ryde <user42@zip.com.au>]

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I think I'll add some small test cases for putenv and friends,

	* tests/posix.test: New file.
	* Makefile.am (SCM_TESTS): Add it.

I don't want to gratuitously provoke failures, but the tests reflect
the documentation and systems with problems need to be identified :-).


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;;;; posix.test --- Test suite for Guile POSIX functions. -*- scheme -*-
;;;;
;;;; Copyright 2003 Free Software Foundation, Inc.
;;;;
;;;; This program 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 2, or (at your option)
;;;; any later version.
;;;;
;;;; This program 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 this software; see the file COPYING.  If not, write to
;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
;;;; Boston, MA 02111-1307 USA

(use-modules (test-suite lib))


;;
;; putenv
;;

(with-test-prefix "putenv"
  
  (pass-if "something"
    (putenv "FOO=something")
    (equal? "something" (getenv "FOO")))
  
  (pass-if "replacing"
    (putenv "FOO=one")
    (putenv "FOO=two")
    (equal? "two" (getenv "FOO")))
  
  (pass-if "empty"
    (putenv "FOO=")
    (equal? "" (getenv "FOO")))
  
  (pass-if "removing"
    (putenv "FOO=bar")
    (putenv "FOO")
    (not (getenv "FOO")))
  
  (pass-if "modifying string doesn't change env"
    (let ((s (string-copy "FOO=bar")))
      (putenv s)
      (string-set! s 5 #\x)
      (equal? "bar" (getenv "FOO")))))

;;
;; setenv
;;

(with-test-prefix "setenv"
  
  (pass-if "something"
    (setenv "FOO" "something")
    (equal? "something" (getenv "FOO")))
  
  (pass-if "replacing"
    (setenv "FOO" "one")
    (setenv "FOO" "two")
    (equal? "two" (getenv "FOO")))

  (pass-if "empty"
    (setenv "FOO" "")
    (equal? "" (getenv "FOO")))
  
  (pass-if "removing"
    (setenv "FOO" "something")
    (setenv "FOO" #f)
    (not (getenv "FOO"))))
  
;;
;; unsetenv
;;

(with-test-prefix "unsetenv"
  
  (pass-if "something"
    (putenv "FOO=something")
    (unsetenv "FOO")
    (not (getenv "FOO")))
  
  (pass-if "empty"
    (putenv "FOO=")
    (unsetenv "FOO")
    (not (getenv "FOO"))))

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