lib/tests/text_test.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * core_text unit tests.
  19  *
  20  * @package    core
  21  * @category   phpunit
  22  * @copyright  2012 Petr Skoda {@link http://skodak.org}
  23  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26 defined('MOODLE_INTERNAL') || die();
  27
  28
  29 /**
  30  * Unit tests for our utf-8 aware text processing.
  31  *
  32  * @package    core
  33  * @category   phpunit
  34  * @copyright  2010 Petr Skoda (http://skodak.org)
  35  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  36  */
  37 class core_text_testcase extends advanced_testcase {
  38
  39     /**
  40      * Tests the static parse charset method.
  41      */
  42     public function test_parse_charset() {
  43         $this->assertSame('windows-1250', core_text::parse_charset('Cp1250'));
  44         // Does typo3 work? Some encoding moodle does not use.
  45         $this->assertSame('windows-1252', core_text::parse_charset('ms-ansi'));
  46     }
  47
  48     /**
  49      * Tests the static convert method.
  50      */
  51     public function test_convert() {
  52         $utf8 = "Žluťoučký koníček";
  53         $iso2 = pack("H*", "ae6c75bb6f75e86bfd206b6f6eede8656b");
  54         $win  = pack("H*", "8e6c759d6f75e86bfd206b6f6eede8656b");
  55         $this->assertSame($iso2, core_text::convert($utf8, 'utf-8', 'iso-8859-2'));
  56         $this->assertSame($utf8, core_text::convert($iso2, 'iso-8859-2', 'utf-8'));
  57         $this->assertSame($win, core_text::convert($utf8, 'utf-8', 'win-1250'));
  58         $this->assertSame($utf8, core_text::convert($win, 'win-1250', 'utf-8'));
  59         $this->assertSame($iso2, core_text::convert($win, 'win-1250', 'iso-8859-2'));
  60         $this->assertSame($win, core_text::convert($iso2, 'iso-8859-2', 'win-1250'));
  61         $this->assertSame($iso2, core_text::convert($iso2, 'iso-8859-2', 'iso-8859-2'));
  62         $this->assertSame($win, core_text::convert($win, 'win-1250', 'cp1250'));
  63         $this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));
  64
  65         $utf8 = '言語設定';
  66         $str = pack("H*", "b8c0b8ecc0dfc4ea"); // EUC-JP
  67         $this->assertSame($str, core_text::convert($utf8, 'utf-8', 'EUC-JP'));
  68         $this->assertSame($utf8, core_text::convert($str, 'EUC-JP', 'utf-8'));
  69         $this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));
  70
  71         $str = pack("H*", "1b24423840386c405f446a1b2842"); // ISO-2022-JP
  72         $this->assertSame($str, core_text::convert($utf8, 'utf-8', 'ISO-2022-JP'));
  73         $this->assertSame($utf8, core_text::convert($str, 'ISO-2022-JP', 'utf-8'));
  74         $this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));
  75
  76         $str = pack("H*", "8cbe8cea90dd92e8"); // SHIFT-JIS
  77         $this->assertSame($str, core_text::convert($utf8, 'utf-8', 'SHIFT-JIS'));
  78         $this->assertSame($utf8, core_text::convert($str, 'SHIFT-JIS', 'utf-8'));
  79         $this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));
  80
  81         $utf8 = '简体中文';
  82         $str = pack("H*", "bcf2cce5d6d0cec4"); // GB2312
  83         $this->assertSame($str, core_text::convert($utf8, 'utf-8', 'GB2312'));
  84         $this->assertSame($utf8, core_text::convert($str, 'GB2312', 'utf-8'));
  85         $this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));
  86
  87         $str = pack("H*", "bcf2cce5d6d0cec4"); // GB18030
  88         $this->assertSame($str, core_text::convert($utf8, 'utf-8', 'GB18030'));
  89         $this->assertSame($utf8, core_text::convert($str, 'GB18030', 'utf-8'));
  90         $this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));
  91
  92         $utf8 = "Žluťoučký koníček";
  93         $this->assertSame('Zlutoucky konicek', core_text::convert($utf8, 'utf-8', 'ascii'));
  94         $this->assertSame($utf8, core_text::convert($utf8.chr(130), 'utf-8', 'utf-8'));
  95         $utf8 = "Der eine stößt den Speer zum Mann";
  96         $this->assertSame('Der eine stoesst den Speer zum Mann', core_text::convert($utf8, 'utf-8', 'ascii'));
  97         $iso1 = core_text::convert($utf8, 'utf-8', 'iso-8859-1');
  98         $this->assertSame('Der eine stoesst den Speer zum Mann', core_text::convert($iso1, 'iso-8859-1', 'ascii'));
  99     }
 100
 101     /**
 102      * Tests the static sub string method.
 103      */
 104     public function test_substr() {
 105         $str = "Žluťoučký koníček";
 106         $this->assertSame($str, core_text::substr($str, 0));
 107         $this->assertSame('luťoučký koníček', core_text::substr($str, 1));
 108         $this->assertSame('luť', core_text::substr($str, 1, 3));
 109         $this->assertSame($str, core_text::substr($str, 0, 100));
 110         $this->assertSame('če', core_text::substr($str, -3, 2));
 111
 112         $iso2 = pack("H*", "ae6c75bb6f75e86bfd206b6f6eede8656b");
 113         $this->assertSame(core_text::convert('luť', 'utf-8', 'iso-8859-2'), core_text::substr($iso2, 1, 3, 'iso-8859-2'));
 114         $this->assertSame(core_text::convert($str, 'utf-8', 'iso-8859-2'), core_text::substr($iso2, 0, 100, 'iso-8859-2'));
 115         $this->assertSame(core_text::convert('če', 'utf-8', 'iso-8859-2'), core_text::substr($iso2, -3, 2, 'iso-8859-2'));
 116
 117         $win  = pack("H*", "8e6c759d6f75e86bfd206b6f6eede8656b");
 118         $this->assertSame(core_text::convert('luť', 'utf-8', 'cp1250'), core_text::substr($win, 1, 3, 'cp1250'));
 119         $this->assertSame(core_text::convert($str, 'utf-8', 'cp1250'), core_text::substr($win, 0, 100, 'cp1250'));
 120         $this->assertSame(core_text::convert('če', 'utf-8', 'cp1250'), core_text::substr($win, -3, 2, 'cp1250'));
 121
 122         $str = pack("H*", "b8c0b8ecc0dfc4ea"); // EUC-JP
 123         $s = pack("H*", "b8ec"); // EUC-JP
 124         $this->assertSame($s, core_text::substr($str, 1, 1, 'EUC-JP'));
 125
 126         $str = pack("H*", "1b24423840386c405f446a1b2842"); // ISO-2022-JP
 127         $s = pack("H*", "1b2442386c1b2842"); // ISO-2022-JP
 128         $this->assertSame($s, core_text::substr($str, 1, 1, 'ISO-2022-JP'));
 129
 130         $str = pack("H*", "8cbe8cea90dd92e8"); // SHIFT-JIS
 131         $s = pack("H*", "8cea"); // SHIFT-JIS
 132         $this->assertSame($s, core_text::substr($str, 1, 1, 'SHIFT-JIS'));
 133
 134         $str = pack("H*", "bcf2cce5d6d0cec4"); // GB2312
 135         $s = pack("H*", "cce5"); // GB2312
 136         $this->assertSame($s, core_text::substr($str, 1, 1, 'GB2312'));
 137
 138         $str = pack("H*", "bcf2cce5d6d0cec4"); // GB18030
 139         $s = pack("H*", "cce5"); // GB18030
 140         $this->assertSame($s, core_text::substr($str, 1, 1, 'GB18030'));
 141     }
 142
 143     /**
 144      * Tests the static string length method.
 145      */
 146     public function test_strlen() {
 147         $str = "Žluťoučký koníček";
 148         $this->assertSame(17, core_text::strlen($str));
 149
 150         $iso2 = pack("H*", "ae6c75bb6f75e86bfd206b6f6eede8656b");
 151         $this->assertSame(17, core_text::strlen($iso2, 'iso-8859-2'));
 152
 153         $win  = pack("H*", "8e6c759d6f75e86bfd206b6f6eede8656b");
 154         $this->assertSame(17, core_text::strlen($win, 'cp1250'));
 155
 156         $str = pack("H*", "b8ec"); // EUC-JP
 157         $this->assertSame(1, core_text::strlen($str, 'EUC-JP'));
 158         $str = pack("H*", "b8c0b8ecc0dfc4ea"); // EUC-JP
 159         $this->assertSame(4, core_text::strlen($str, 'EUC-JP'));
 160
 161         $str = pack("H*", "1b2442386c1b2842"); // ISO-2022-JP
 162         $this->assertSame(1, core_text::strlen($str, 'ISO-2022-JP'));
 163         $str = pack("H*", "1b24423840386c405f446a1b2842"); // ISO-2022-JP
 164         $this->assertSame(4, core_text::strlen($str, 'ISO-2022-JP'));
 165
 166         $str = pack("H*", "8cea"); // SHIFT-JIS
 167         $this->assertSame(1, core_text::strlen($str, 'SHIFT-JIS'));
 168         $str = pack("H*", "8cbe8cea90dd92e8"); // SHIFT-JIS
 169         $this->assertSame(4, core_text::strlen($str, 'SHIFT-JIS'));
 170
 171         $str = pack("H*", "cce5"); // GB2312
 172         $this->assertSame(1, core_text::strlen($str, 'GB2312'));
 173         $str = pack("H*", "bcf2cce5d6d0cec4"); // GB2312
 174         $this->assertSame(4, core_text::strlen($str, 'GB2312'));
 175
 176         $str = pack("H*", "cce5"); // GB18030
 177         $this->assertSame(1, core_text::strlen($str, 'GB18030'));
 178         $str = pack("H*", "bcf2cce5d6d0cec4"); // GB18030
 179         $this->assertSame(4, core_text::strlen($str, 'GB18030'));
 180     }
 181
 182     /**
 183      * Test unicode safe string truncation.
 184      */
 185     public function test_str_max_bytes() {
 186         // These are all 3 byte characters, so this is a 12-byte string.
 187         $str = '言語設定';
 188
 189         $this->assertEquals(12, strlen($str));
 190
 191         // Step back, shortening the string 1 byte at a time. Should remove in 1 char chunks.
 192         $conv = core_text::str_max_bytes($str, 12);
 193         $this->assertEquals(12, strlen($conv));
 194         $this->assertSame('言語設定', $conv);
 195         $conv = core_text::str_max_bytes($str, 11);
 196         $this->assertEquals(9, strlen($conv));
 197         $this->assertSame('言語設', $conv);
 198         $conv = core_text::str_max_bytes($str, 10);
 199         $this->assertEquals(9, strlen($conv));
 200         $this->assertSame('言語設', $conv);
 201         $conv = core_text::str_max_bytes($str, 9);
 202         $this->assertEquals(9, strlen($conv));
 203         $this->assertSame('言語設', $conv);
 204         $conv = core_text::str_max_bytes($str, 8);
 205         $this->assertEquals(6, strlen($conv));
 206         $this->assertSame('言語', $conv);
 207
 208         // Now try a mixed byte string.
 209         $str = '言語設a定';
 210
 211         $this->assertEquals(13, strlen($str));
 212
 213         $conv = core_text::str_max_bytes($str, 11);
 214         $this->assertEquals(10, strlen($conv));
 215         $this->assertSame('言語設a', $conv);
 216         $conv = core_text::str_max_bytes($str, 10);
 217         $this->assertEquals(10, strlen($conv));
 218         $this->assertSame('言語設a', $conv);
 219         $conv = core_text::str_max_bytes($str, 9);
 220         $this->assertEquals(9, strlen($conv));
 221         $this->assertSame('言語設', $conv);
 222         $conv = core_text::str_max_bytes($str, 8);
 223         $this->assertEquals(6, strlen($conv));
 224         $this->assertSame('言語', $conv);
 225
 226         // Test 0 byte case.
 227         $conv = core_text::str_max_bytes($str, 0);
 228         $this->assertEquals(0, strlen($conv));
 229         $this->assertSame('', $conv);
 230     }
 231
 232     /**
 233      * Tests the static strtolower method.
 234      */
 235     public function test_strtolower() {
 236         $str = "Žluťoučký koníček";
 237         $low = 'žluťoučký koníček';
 238         $this->assertSame($low, core_text::strtolower($str));
 239
 240         $iso2 = pack("H*", "ae6c75bb6f75e86bfd206b6f6eede8656b");
 241         $this->assertSame(core_text::convert($low, 'utf-8', 'iso-8859-2'), core_text::strtolower($iso2, 'iso-8859-2'));
 242
 243         $win  = pack("H*", "8e6c759d6f75e86bfd206b6f6eede8656b");
 244         $this->assertSame(core_text::convert($low, 'utf-8', 'cp1250'), core_text::strtolower($win, 'cp1250'));
 245
 246         $str = '言語設定';
 247         $this->assertSame($str, core_text::strtolower($str));
 248
 249         $str = '简体中文';
 250         $this->assertSame($str, core_text::strtolower($str));
 251
 252         $str = pack("H*", "1b24423840386c405f446a1b2842"); // ISO-2022-JP
 253         $this->assertSame($str, core_text::strtolower($str, 'ISO-2022-JP'));
 254
 255         $str = pack("H*", "8cbe8cea90dd92e8"); // SHIFT-JIS
 256         $this->assertSame($str, core_text::strtolower($str, 'SHIFT-JIS'));
 257
 258         $str = pack("H*", "bcf2cce5d6d0cec4"); // GB2312
 259         $this->assertSame($str, core_text::strtolower($str, 'GB2312'));
 260
 261         $str = pack("H*", "bcf2cce5d6d0cec4"); // GB18030
 262         $this->assertSame($str, core_text::strtolower($str, 'GB18030'));
 263
 264         // Typo3 has problems with integers.
 265         $str = 1309528800;
 266         $this->assertSame((string)$str, core_text::strtolower($str));
 267     }
 268
 269     /**
 270      * Tests the static strtoupper.
 271      */
 272     public function test_strtoupper() {
 273         $str = "Žluťoučký koníček";
 274         $up  = 'ŽLUŤOUČKÝ KONÍČEK';
 275         $this->assertSame($up, core_text::strtoupper($str));
 276
 277         $iso2 = pack("H*", "ae6c75bb6f75e86bfd206b6f6eede8656b");
 278         $this->assertSame(core_text::convert($up, 'utf-8', 'iso-8859-2'), core_text::strtoupper($iso2, 'iso-8859-2'));
 279
 280         $win  = pack("H*", "8e6c759d6f75e86bfd206b6f6eede8656b");
 281         $this->assertSame(core_text::convert($up, 'utf-8', 'cp1250'), core_text::strtoupper($win, 'cp1250'));
 282
 283         $str = '言語設定';
 284         $this->assertSame($str, core_text::strtoupper($str));
 285
 286         $str = '简体中文';
 287         $this->assertSame($str, core_text::strtoupper($str));
 288
 289         $str = pack("H*", "1b24423840386c405f446a1b2842"); // ISO-2022-JP
 290         $this->assertSame($str, core_text::strtoupper($str, 'ISO-2022-JP'));
 291
 292         $str = pack("H*", "8cbe8cea90dd92e8"); // SHIFT-JIS
 293         $this->assertSame($str, core_text::strtoupper($str, 'SHIFT-JIS'));
 294
 295         $str = pack("H*", "bcf2cce5d6d0cec4"); // GB2312
 296         $this->assertSame($str, core_text::strtoupper($str, 'GB2312'));
 297
 298         $str = pack("H*", "bcf2cce5d6d0cec4"); // GB18030
 299         $this->assertSame($str, core_text::strtoupper($str, 'GB18030'));
 300     }
 301
 302     /**
 303      * Test the strrev method.
 304      */
 305     public function test_strrev() {
 306         $strings = array(
 307             "Žluťoučký koníček" => "kečínok ýkčuoťulŽ",
 308             'ŽLUŤOUČKÝ KONÍČEK' => "KEČÍNOK ÝKČUOŤULŽ",
 309             '言語設定' => '定設語言',
 310             '简体中文' => '文中体简',
 311             "Der eine stößt den Speer zum Mann" => "nnaM muz reepS ned tßöts enie reD"
 312         );
 313         foreach ($strings as $before => $after) {
 314             // Make sure we can reverse it both ways and that it comes out the same.
 315             $this->assertSame($after, core_text::strrev($before));
 316             $this->assertSame($before, core_text::strrev($after));
 317             // Reverse it twice to be doubly sure.
 318             $this->assertSame($after, core_text::strrev(core_text::strrev($after)));
 319         }
 320     }
 321
 322     /**
 323      * Tests the static strpos method.
 324      */
 325     public function test_strpos() {
 326         $str = "Žluťoučký koníček";
 327         $this->assertSame(10, core_text::strpos($str, 'koníč'));
 328     }
 329
 330     /**
 331      * Tests the static strrpos.
 332      */
 333     public function test_strrpos() {
 334         $str = "Žluťoučký koníček";
 335         $this->assertSame(11, core_text::strrpos($str, 'o'));
 336     }
 337
 338     /**
 339      * Tests the static specialtoascii method.
 340      */
 341     public function test_specialtoascii() {
 342         $str = "Žluťoučký koníček";
 343         $this->assertSame('Zlutoucky konicek', core_text::specialtoascii($str));
 344     }
 345
 346     /**
 347      * Tests the static encode_mimeheader method.
 348      * This also tests method moodle_phpmailer::encodeHeader that calls core_text::encode_mimeheader
 349      */
 350     public function test_encode_mimeheader() {
 351         global $CFG;
 352         require_once($CFG->libdir.'/phpmailer/moodle_phpmailer.php');
 353         $mailer = new moodle_phpmailer();
 354
 355         // Encode short string with non-latin characters.
 356         $str = "Žluťoučký koníček";
 357         $encodedstr = '=?utf-8?B?xb1sdcWlb3XEjWvDvSBrb27DrcSNZWs=?=';
 358         $this->assertSame($encodedstr, core_text::encode_mimeheader($str));
 359         $this->assertSame($encodedstr, $mailer->encodeHeader($str));
 360         $this->assertSame('"' . $encodedstr . '"', $mailer->encodeHeader($str, 'phrase'));
 361
 362         // Encode short string without non-latin characters. Make sure the quotes are escaped in quoted email headers.
 363         $latinstr = 'text"with quotes';
 364         $this->assertSame($latinstr, core_text::encode_mimeheader($latinstr));
 365         $this->assertSame($latinstr, $mailer->encodeHeader($latinstr));
 366         $this->assertSame('"text\\"with quotes"', $mailer->encodeHeader($latinstr, 'phrase'));
 367
 368         // Encode long string without non-latin characters.
 369         $longlatinstr = 'This is a very long text that still should not be split into several lines in the email headers because '.
 370             'it does not have any non-latin characters. The "quotes" and \\backslashes should be escaped only if it\'s a part of email address';
 371         $this->assertSame($longlatinstr, core_text::encode_mimeheader($longlatinstr));
 372         $this->assertSame($longlatinstr, $mailer->encodeHeader($longlatinstr));
 373         $longlatinstrwithslash = preg_replace(['/\\\\/', "/\"/"], ['\\\\\\', '\\"'], $longlatinstr);
 374         $this->assertSame('"' . $longlatinstrwithslash . '"', $mailer->encodeHeader($longlatinstr, 'phrase'));
 375
 376         // Encode long string with non-latin characters.
 377         $longstr = "Неопознанная ошибка в файле C:\\tmp\\: \"Не пользуйтесь виндоуз\"";
 378         $encodedlongstr = "=?utf-8?B?0J3QtdC+0L/QvtC30L3QsNC90L3QsNGPINC+0YjQuNCx0LrQsCDQsiDRhNCw?=
 379  =?utf-8?B?0LnQu9C1IEM6XHRtcFw6ICLQndC1INC/0L7Qu9GM0LfRg9C50YLQtdGB?=
 380  =?utf-8?B?0Ywg0LLQuNC90LTQvtGD0Lci?=";
 381         $this->assertSame($encodedlongstr, $mailer->encodeHeader($longstr));
 382         $this->assertSame('"' . $encodedlongstr . '"', $mailer->encodeHeader($longstr, 'phrase'));
 383     }
 384
 385     /**
 386      * Tests the static entities_to_utf8 method.
 387      */
 388     public function test_entities_to_utf8() {
 389         $str = "&#x17d;lu&#x165;ou&#x10d;k&#xfd; kon&iacute;&#269;ek&copy;&quot;&amp;&lt;&gt;&sect;&laquo;";
 390         $this->assertSame("Žluťoučký koníček©\"&<>§«", core_text::entities_to_utf8($str));
 391     }
 392
 393     /**
 394      * Tests the static utf8_to_entities method.
 395      */
 396     public function test_utf8_to_entities() {
 397         $str = "&#x17d;luťoučký kon&iacute;ček&copy;&quot;&amp;&lt;&gt;&sect;&laquo;";
 398         $this->assertSame("&#x17d;lu&#x165;ou&#x10d;k&#xfd; kon&iacute;&#x10d;ek&copy;&quot;&amp;&lt;&gt;&sect;&laquo;", core_text::utf8_to_entities($str));
 399         $this->assertSame("&#381;lu&#357;ou&#269;k&#253; kon&iacute;&#269;ek&copy;&quot;&amp;&lt;&gt;&sect;&laquo;", core_text::utf8_to_entities($str, true));
 400
 401         $str = "&#381;luťoučký kon&iacute;ček&copy;&quot;&amp;&lt;&gt;&sect;&laquo;";
 402         $this->assertSame("&#x17d;lu&#x165;ou&#x10d;k&#xfd; kon&#xed;&#x10d;ek&#xa9;\"&<>&#xa7;&#xab;", core_text::utf8_to_entities($str, false, true));
 403         $this->assertSame("&#381;lu&#357;ou&#269;k&#253; kon&#237;&#269;ek&#169;\"&<>&#167;&#171;", core_text::utf8_to_entities($str, true, true));
 404     }
 405
 406     /**
 407      * Tests the static trim_utf8_bom method.
 408      */
 409     public function test_trim_utf8_bom() {
 410         $bom = "\xef\xbb\xbf";
 411         $str = "Žluťoučký koníček";
 412         $this->assertSame($str.$bom, core_text::trim_utf8_bom($bom.$str.$bom));
 413     }
 414
 415     /**
 416      * Tests the static remove_unicode_non_characters method.
 417      */
 418     public function test_remove_unicode_non_characters() {
 419         // Confirm that texts which don't contain these characters are unchanged.
 420         $this->assertSame('Frogs!', core_text::remove_unicode_non_characters('Frogs!'));
 421
 422         // Even if they contain some very scary characters.
 423         $example = html_entity_decode('A&#xfffd;&#x1d15f;B');
 424         $this->assertSame($example, core_text::remove_unicode_non_characters($example));
 425
 426         // Non-characters are removed wherever they may be, with other characters left.
 427         $example = html_entity_decode('&#xfffe;A&#xffff;B&#x8fffe;C&#xfdd0;D&#xfffd;E&#xfdd5;');
 428         $expected = html_entity_decode('ABCD&#xfffd;E');
 429         $this->assertSame($expected, core_text::remove_unicode_non_characters($example));
 430
 431         // If you only have a non-character, you get empty string.
 432         $example = html_entity_decode('&#xfffe;');
 433         $this->assertSame('', core_text::remove_unicode_non_characters($example));
 434     }
 435
 436     /**
 437      * Tests the static get_encodings method.
 438      */
 439     public function test_get_encodings() {
 440         $encodings = core_text::get_encodings();
 441         $this->assertTrue(is_array($encodings));
 442         $this->assertTrue(count($encodings) > 1);
 443         $this->assertTrue(isset($encodings['UTF-8']));
 444     }
 445
 446     /**
 447      * Tests the static code2utf8 method.
 448      */
 449     public function test_code2utf8() {
 450         $this->assertSame('Ž', core_text::code2utf8(381));
 451     }
 452
 453     /**
 454      * Tests the static utf8ord method.
 455      */
 456     public function test_utf8ord() {
 457         $this->assertSame(ord(''), core_text::utf8ord(''));
 458         $this->assertSame(ord('f'), core_text::utf8ord('f'));
 459         $this->assertSame(0x03B1, core_text::utf8ord('α'));
 460         $this->assertSame(0x0439, core_text::utf8ord('й'));
 461         $this->assertSame(0x2FA1F, core_text::utf8ord('𯨟'));
 462         $this->assertSame(381, core_text::utf8ord('Ž'));
 463     }
 464
 465     /**
 466      * Tests the static strtotitle method.
 467      */
 468     public function test_strtotitle() {
 469         $str = "žluťoučký koníček";
 470         $this->assertSame("Žluťoučký Koníček", core_text::strtotitle($str));
 471     }
 472
 473     /**
 474      * Test strrchr.
 475      */
 476     public function test_strrchr() {
 477         $str = "Žluťoučký koníček";
 478         $this->assertSame('koníček', core_text::strrchr($str, 'koní'));
 479         $this->assertSame('Žluťoučký ', core_text::strrchr($str, 'koní', true));
 480         $this->assertFalse(core_text::strrchr($str, 'A'));
 481         $this->assertFalse(core_text::strrchr($str, 'ç', true));
 482     }
 483 }
 484