i18n: Add case mapping and case-insensitive string comparison tests.

Thanks to Mark H Weaver <mhw@netris.org> for coming up with most of the
examples.

* test-suite/tests/i18n.test (%german-utf8-locale-name,
  %greek-utf8-locale-name): New variables.
  (under-german-utf8-locale-or-unresolved,
  under-greek-utf8-locale-or-unresolved): New procedures.
  ("text collation (German)", "text collation (Greek)"): New tests
  prefixes.
  ("string mapping")["string-locale-upcase German",
  "string-locale-upcase Greek", "string-locale-upcase Greek (two
  sigmas)", "string-locale-downcase Greek", "string-locale-downcase
  Greek (two sigmas)"]: New tests.

test-suite/tests/i18n.test

@@ -1,6 +1,6 @@
 ;;;; i18n.test --- Exercise the i18n API.  -*- coding: utf-8; mode: scheme; -*-
 ;;;;
-;;;; Copyright (C) 2006, 2007, 2009, 2010 Free Software Foundation, Inc.
+;;;; Copyright (C) 2006, 2007, 2009, 2010, 2011 Free Software Foundation, Inc.
 ;;;; Ludovic Courtès
 ;;;;
 ;;;; This library is free software; you can redistribute it and/or
@@ -88,6 +88,12 @@
 (define %turkish-utf8-locale-name
   "tr_TR.UTF-8")
 
+(define %german-utf8-locale-name
+  "de_DE.UTF-8")
+
+(define %greek-utf8-locale-name
+  "el_GR.UTF-8")
+
 (define %french-locale
   (false-if-exception
    (make-locale (list LC_CTYPE LC_COLLATE LC_NUMERIC LC_TIME)
@@ -124,6 +130,12 @@
 (define (under-turkish-utf8-locale-or-unresolved thunk)
   (under-locale-or-unresolved %turkish-utf8-locale thunk))
 
+(define (under-german-utf8-locale-or-unresolved thunk)
+  (under-locale-or-unresolved %german-utf8-locale-name thunk))
+
+(define (under-greek-utf8-locale-or-unresolved thunk)
+  (under-locale-or-unresolved %greek-utf8-locale-name thunk))
+
 (with-test-prefix "text collation (French)"
 
   (pass-if "string-locale<?"
@@ -191,6 +203,24 @@
          (and (char-locale-ci<? #\o #\œ %french-utf8-locale)
               (char-locale-ci>? #\Π#\e %french-utf8-locale))))))
 
+
+(with-test-prefix "text collation (German)"
+
+  (pass-if "string-locale-ci=?"
+    (under-german-utf8-locale-or-unresolved
+     (lambda ()
+       (let ((de (make-locale LC_ALL %german-utf8-locale-name)))
+         (string-locale-ci=? "Straße" "STRASSE"))))))
+
+
+(with-test-prefix "text collation (Greek)"
+
+  (pass-if "string-locale-ci=?"
+    (under-greek-utf8-locale-or-unresolved
+     (lambda ()
+       (let ((gr (make-locale LC_ALL %greek-utf8-locale-name)))
+         (string-locale-ci=? "ΧΑΟΣ" "χαος" gr))))))
+
 
 (with-test-prefix "character mapping"
 
@@ -236,6 +266,41 @@
 	 (string=? "Hello, World" (string-locale-titlecase 
 				   "hello, world" (make-locale LC_ALL "C")))))
 
+  (pass-if "string-locale-upcase German"
+    (under-german-utf8-locale-or-unresolved
+     (lambda ()
+       (let ((de (make-locale LC_ALL %german-utf8-locale-name)))
+         (string=? "STRASSE"
+                   (string-locale-upcase "Straße" de))))))
+
+  (pass-if "string-locale-upcase Greek"
+    (under-greek-utf8-locale-or-unresolved
+     (lambda ()
+       (let ((el (make-locale LC_ALL %greek-utf8-locale-name)))
+         (string=? "ΧΑΟΣ"
+                   (string-locale-upcase "χαος" el))))))
+
+  (pass-if "string-locale-upcase Greek (two sigmas)"
+    (under-greek-utf8-locale-or-unresolved
+     (lambda ()
+       (let ((el (make-locale LC_ALL %greek-utf8-locale-name)))
+         (string=? "ΓΕΙΆ ΣΑΣ"
+                   (string-locale-upcase "Γειά σας" el))))))
+
+  (pass-if "string-locale-downcase Greek"
+    (under-greek-utf8-locale-or-unresolved
+     (lambda ()
+       (let ((el (make-locale LC_ALL %greek-utf8-locale-name)))
+         (string=? "χαος"
+                   (string-locale-downcase "ΧΑΟΣ" el))))))
+
+  (pass-if "string-locale-downcase Greek (two sigmas)"
+    (under-greek-utf8-locale-or-unresolved
+     (lambda ()
+       (let ((el (make-locale LC_ALL %greek-utf8-locale-name)))
+         (string=? "γειά σας"
+                   (string-locale-downcase "ΓΕΙΆ ΣΑΣ" el))))))
+
   (pass-if "string-locale-upcase Turkish"
     (under-turkish-utf8-locale-or-unresolved
      (lambda ()