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<?php// This file is part of Moodle - http://moodle.org///// Moodle 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.//// Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>./*** core_text unit tests.** @package core* @category phpunit* @copyright 2012 Petr Skoda {@link http://skodak.org}* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later*/defined('MOODLE_INTERNAL') || die();/*** Unit tests for our utf-8 aware text processing.** @package core* @category phpunit* @copyright 2010 Petr Skoda (http://skodak.org)* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later* @coversDefaultClass \core_text**/class text_test extends advanced_testcase {/*** Tests the static parse charset method.** @covers ::parse_charset()*/public function test_parse_charset(): void {$this->assertSame('windows-1250', core_text::parse_charset('Cp1250'));// Some encoding moodle does not use.$this->assertSame('windows-1252', core_text::parse_charset('ms-ansi'));}/*** Tests the static convert method.** @covers ::convert()*/public function test_convert(): void {$this->assertSame('', core_text::convert('', 'utf-8', 'utf-8'));$utf8 = "Žluťoučký koníček";$iso2 = pack("H*", "ae6c75bb6f75e86bfd206b6f6eede8656b");$win = pack("H*", "8e6c759d6f75e86bfd206b6f6eede8656b");$this->assertSame($iso2, core_text::convert($utf8, 'utf-8', 'iso-8859-2'));$this->assertSame($utf8, core_text::convert($iso2, 'iso-8859-2', 'utf-8'));$this->assertSame($win, core_text::convert($utf8, 'utf-8', 'win-1250'));$this->assertSame($utf8, core_text::convert($win, 'win-1250', 'utf-8'));$this->assertSame($iso2, core_text::convert($win, 'win-1250', 'iso-8859-2'));$this->assertSame($win, core_text::convert($iso2, 'iso-8859-2', 'win-1250'));$this->assertSame($iso2, core_text::convert($iso2, 'iso-8859-2', 'iso-8859-2'));$this->assertSame($win, core_text::convert($win, 'win-1250', 'cp1250'));$this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));$utf8 = '言語設定';$str = pack("H*", "b8c0b8ecc0dfc4ea"); // EUC-JP$this->assertSame($str, core_text::convert($utf8, 'utf-8', 'EUC-JP'));$this->assertSame($utf8, core_text::convert($str, 'EUC-JP', 'utf-8'));$this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));$str = pack("H*", "1b24423840386c405f446a1b2842"); // ISO-2022-JP$this->assertSame($str, core_text::convert($utf8, 'utf-8', 'ISO-2022-JP'));$this->assertSame($utf8, core_text::convert($str, 'ISO-2022-JP', 'utf-8'));$this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));$str = pack("H*", "8cbe8cea90dd92e8"); // SHIFT-JIS$this->assertSame($str, core_text::convert($utf8, 'utf-8', 'SHIFT-JIS'));$this->assertSame($utf8, core_text::convert($str, 'SHIFT-JIS', 'utf-8'));$this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));$utf8 = '简体中文';$str = pack("H*", "bcf2cce5d6d0cec4"); // GB2312$this->assertSame($str, core_text::convert($utf8, 'utf-8', 'GB2312'));$this->assertSame($utf8, core_text::convert($str, 'GB2312', 'utf-8'));$this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));$str = pack("H*", "bcf2cce5d6d0cec4"); // GB18030$this->assertSame($str, core_text::convert($utf8, 'utf-8', 'GB18030'));$this->assertSame($utf8, core_text::convert($str, 'GB18030', 'utf-8'));$this->assertSame($utf8, core_text::convert($utf8, 'utf-8', 'utf-8'));$utf8 = "Žluťoučký koníček";$this->assertSame('Zlutoucky konicek', core_text::convert($utf8, 'utf-8', 'ascii'));$this->assertSame($utf8, core_text::convert($utf8.chr(130), 'utf-8', 'utf-8'));$utf8 = "Der eine stößt den Speer zum Mann";$this->assertSame('Der eine stosst den Speer zum Mann', core_text::convert($utf8, 'utf-8', 'ascii'));$iso1 = core_text::convert($utf8, 'utf-8', 'iso-8859-1');$this->assertSame('Der eine stosst den Speer zum Mann', core_text::convert($iso1, 'iso-8859-1', 'ascii'));$utf8 = "A æ Übérmensch på høyeste nivå! И я люблю PHP! есть. アクセシビリティ. fi";$this->assertSame("A ae Ubermensch pa hoyeste niva! I a lublu PHP! est'. akuseshibiriti. fi",core_text::convert($utf8, 'utf-8', 'ascii'));// Check that null argument is allowed.$this->assertSame('', core_text::convert(null, 'utf-8', 'ascii'));}/*** Tests the static sub string method.** @covers ::substr()*/public function test_substr(): void {$str = "Žluťoučký koníček";$this->assertSame($str, core_text::substr($str, 0));$this->assertSame('luťoučký koníček', core_text::substr($str, 1));$this->assertSame('luť', core_text::substr($str, 1, 3));$this->assertSame($str, core_text::substr($str, 0, 100));$this->assertSame('če', core_text::substr($str, -3, 2));$iso2 = pack("H*", "ae6c75bb6f75e86bfd206b6f6eede8656b");$this->assertSame(core_text::convert('luť', 'utf-8', 'iso-8859-2'), core_text::substr($iso2, 1, 3, 'iso-8859-2'));$this->assertSame(core_text::convert($str, 'utf-8', 'iso-8859-2'), core_text::substr($iso2, 0, 100, 'iso-8859-2'));$this->assertSame(core_text::convert('če', 'utf-8', 'iso-8859-2'), core_text::substr($iso2, -3, 2, 'iso-8859-2'));$win = pack("H*", "8e6c759d6f75e86bfd206b6f6eede8656b");$this->assertSame(core_text::convert('luť', 'utf-8', 'cp1250'), core_text::substr($win, 1, 3, 'cp1250'));$this->assertSame(core_text::convert($str, 'utf-8', 'cp1250'), core_text::substr($win, 0, 100, 'cp1250'));$this->assertSame(core_text::convert('če', 'utf-8', 'cp1250'), core_text::substr($win, -3, 2, 'cp1250'));$str = pack("H*", "b8c0b8ecc0dfc4ea"); // EUC-JP$s = pack("H*", "b8ec"); // EUC-JP$this->assertSame($s, core_text::substr($str, 1, 1, 'EUC-JP'));$str = pack("H*", "1b24423840386c405f446a1b2842"); // ISO-2022-JP$s = pack("H*", "1b2442386c1b2842"); // ISO-2022-JP$this->assertSame($s, core_text::substr($str, 1, 1, 'ISO-2022-JP'));$str = pack("H*", "8cbe8cea90dd92e8"); // SHIFT-JIS$s = pack("H*", "8cea"); // SHIFT-JIS$this->assertSame($s, core_text::substr($str, 1, 1, 'SHIFT-JIS'));$str = pack("H*", "bcf2cce5d6d0cec4"); // GB2312$s = pack("H*", "cce5"); // GB2312$this->assertSame($s, core_text::substr($str, 1, 1, 'GB2312'));$str = pack("H*", "bcf2cce5d6d0cec4"); // GB18030$s = pack("H*", "cce5"); // GB18030$this->assertSame($s, core_text::substr($str, 1, 1, 'GB18030'));// Check that null argument is allowed.$this->assertSame('', core_text::substr(null, 1, 1));$this->assertSame('', core_text::substr(null, 1));$this->assertSame('', core_text::substr(null, 1, 1, 'cp1250'));$this->assertSame('', core_text::substr(null, 1, null, 'cp1250'));}/*** Tests the static string length method.** @covers ::strlen()*/public function test_strlen(): void {$str = "Žluťoučký koníček";$this->assertSame(17, core_text::strlen($str));$iso2 = pack("H*", "ae6c75bb6f75e86bfd206b6f6eede8656b");$this->assertSame(17, core_text::strlen($iso2, 'iso-8859-2'));$win = pack("H*", "8e6c759d6f75e86bfd206b6f6eede8656b");$this->assertSame(17, core_text::strlen($win, 'cp1250'));$str = pack("H*", "b8ec"); // EUC-JP$this->assertSame(1, core_text::strlen($str, 'EUC-JP'));$str = pack("H*", "b8c0b8ecc0dfc4ea"); // EUC-JP$this->assertSame(4, core_text::strlen($str, 'EUC-JP'));$str = pack("H*", "1b2442386c1b2842"); // ISO-2022-JP$this->assertSame(1, core_text::strlen($str, 'ISO-2022-JP'));$str = pack("H*", "1b24423840386c405f446a1b2842"); // ISO-2022-JP$this->assertSame(4, core_text::strlen($str, 'ISO-2022-JP'));$str = pack("H*", "8cea"); // SHIFT-JIS$this->assertSame(1, core_text::strlen($str, 'SHIFT-JIS'));$str = pack("H*", "8cbe8cea90dd92e8"); // SHIFT-JIS$this->assertSame(4, core_text::strlen($str, 'SHIFT-JIS'));$str = pack("H*", "cce5"); // GB2312$this->assertSame(1, core_text::strlen($str, 'GB2312'));$str = pack("H*", "bcf2cce5d6d0cec4"); // GB2312$this->assertSame(4, core_text::strlen($str, 'GB2312'));$str = pack("H*", "cce5"); // GB18030$this->assertSame(1, core_text::strlen($str, 'GB18030'));$str = pack("H*", "bcf2cce5d6d0cec4"); // GB18030$this->assertSame(4, core_text::strlen($str, 'GB18030'));// Check that null argument is allowed.$this->assertSame(0, core_text::strlen(null));$this->assertSame(0, core_text::strlen(null, 'cp1250'));}/*** Test unicode safe string truncation.** @covers ::str_max_bytes()*/public function test_str_max_bytes(): void {// These are all 3 byte characters, so this is a 12-byte string.$str = '言語設定';$this->assertEquals(12, strlen($str));// Step back, shortening the string 1 byte at a time. Should remove in 1 char chunks.$conv = core_text::str_max_bytes($str, 12);$this->assertEquals(12, strlen($conv));$this->assertSame('言語設定', $conv);$conv = core_text::str_max_bytes($str, 11);$this->assertEquals(9, strlen($conv));$this->assertSame('言語設', $conv);$conv = core_text::str_max_bytes($str, 10);$this->assertEquals(9, strlen($conv));$this->assertSame('言語設', $conv);$conv = core_text::str_max_bytes($str, 9);$this->assertEquals(9, strlen($conv));$this->assertSame('言語設', $conv);$conv = core_text::str_max_bytes($str, 8);$this->assertEquals(6, strlen($conv));$this->assertSame('言語', $conv);// Now try a mixed byte string.$str = '言語設a定';$this->assertEquals(13, strlen($str));$conv = core_text::str_max_bytes($str, 11);$this->assertEquals(10, strlen($conv));$this->assertSame('言語設a', $conv);$conv = core_text::str_max_bytes($str, 10);$this->assertEquals(10, strlen($conv));$this->assertSame('言語設a', $conv);$conv = core_text::str_max_bytes($str, 9);$this->assertEquals(9, strlen($conv));$this->assertSame('言語設', $conv);$conv = core_text::str_max_bytes($str, 8);$this->assertEquals(6, strlen($conv));$this->assertSame('言語', $conv);// Test 0 byte case.$conv = core_text::str_max_bytes($str, 0);$this->assertEquals(0, strlen($conv));$this->assertSame('', $conv);// Check that null argument is allowed.$this->assertSame('', core_text::str_max_bytes(null, 1));}/*** Tests the static strtolower method.** @covers ::strtolower()*/public function test_strtolower(): void {$str = "Žluťoučký koníček";$low = 'žluťoučký koníček';$this->assertSame($low, core_text::strtolower($str));$iso2 = pack("H*", "ae6c75bb6f75e86bfd206b6f6eede8656b");$this->assertSame(core_text::convert($low, 'utf-8', 'iso-8859-2'), core_text::strtolower($iso2, 'iso-8859-2'));$win = pack("H*", "8e6c759d6f75e86bfd206b6f6eede8656b");$this->assertSame(core_text::convert($low, 'utf-8', 'cp1250'), core_text::strtolower($win, 'cp1250'));$str = '言語設定';$this->assertSame($str, core_text::strtolower($str));$str = '简体中文';$this->assertSame($str, core_text::strtolower($str));$str = pack("H*", "1b24423840386c405f446a1b2842"); // ISO-2022-JP$this->assertSame($str, core_text::strtolower($str, 'ISO-2022-JP'));$str = pack("H*", "8cbe8cea90dd92e8"); // SHIFT-JIS$this->assertSame($str, core_text::strtolower($str, 'SHIFT-JIS'));$str = pack("H*", "bcf2cce5d6d0cec4"); // GB2312$this->assertSame($str, core_text::strtolower($str, 'GB2312'));$str = pack("H*", "bcf2cce5d6d0cec4"); // GB18030$this->assertSame($str, core_text::strtolower($str, 'GB18030'));$str = 1309528800;$this->assertSame((string)$str, core_text::strtolower($str));// Check that null argument is allowed.$this->assertSame('', core_text::strtolower(null));$this->assertSame('', core_text::strtolower(null, 'cp1250'));}/*** Tests the static strtoupper.** @covers ::strtoupper()*/public function test_strtoupper(): void {$str = "Žluťoučký koníček";$up = 'ŽLUŤOUČKÝ KONÍČEK';$this->assertSame($up, core_text::strtoupper($str));$iso2 = pack("H*", "ae6c75bb6f75e86bfd206b6f6eede8656b");$this->assertSame(core_text::convert($up, 'utf-8', 'iso-8859-2'), core_text::strtoupper($iso2, 'iso-8859-2'));$win = pack("H*", "8e6c759d6f75e86bfd206b6f6eede8656b");$this->assertSame(core_text::convert($up, 'utf-8', 'cp1250'), core_text::strtoupper($win, 'cp1250'));$str = '言語設定';$this->assertSame($str, core_text::strtoupper($str));$str = '简体中文';$this->assertSame($str, core_text::strtoupper($str));$str = pack("H*", "1b24423840386c405f446a1b2842"); // ISO-2022-JP$this->assertSame($str, core_text::strtoupper($str, 'ISO-2022-JP'));$str = pack("H*", "8cbe8cea90dd92e8"); // SHIFT-JIS$this->assertSame($str, core_text::strtoupper($str, 'SHIFT-JIS'));$str = pack("H*", "bcf2cce5d6d0cec4"); // GB2312$this->assertSame($str, core_text::strtoupper($str, 'GB2312'));$str = pack("H*", "bcf2cce5d6d0cec4"); // GB18030$this->assertSame($str, core_text::strtoupper($str, 'GB18030'));// Check that null argument is allowed.$this->assertSame('', core_text::strtoupper(null));$this->assertSame('', core_text::strtoupper(null, 'cp1250'));}/*** Test the strrev method.** @covers ::strrev()*/public function test_strrev(): void {$strings = array("Žluťoučký koníček" => "kečínok ýkčuoťulŽ",'ŽLUŤOUČKÝ KONÍČEK' => "KEČÍNOK ÝKČUOŤULŽ",'言語設定' => '定設語言','简体中文' => '文中体简',"Der eine stößt den Speer zum Mann" => "nnaM muz reepS ned tßöts enie reD");foreach ($strings as $before => $after) {// Make sure we can reverse it both ways and that it comes out the same.$this->assertSame($after, core_text::strrev($before));$this->assertSame($before, core_text::strrev($after));// Reverse it twice to be doubly sure.$this->assertSame($after, core_text::strrev(core_text::strrev($after)));}// Check that null argument is allowed.$this->assertSame('', core_text::strrev(null));}/*** Tests the static strpos method.** @covers ::strpos()*/public function test_strpos(): void {$str = "Žluťoučký koníček";$this->assertSame(10, core_text::strpos($str, 'koníč'));// Check that null argument is allowed.$this->assertSame(false, core_text::strpos(null, 'a'));}/*** Tests the static strrpos.** @covers ::strrpos()*/public function test_strrpos(): void {$str = "Žluťoučký koníček";$this->assertSame(11, core_text::strrpos($str, 'o'));// Check that null argument is allowed.$this->assertSame(false, core_text::strrpos(null, 'o'));}/*** Tests the static specialtoascii method.** @covers ::specialtoascii()*/public function test_specialtoascii(): void {$str = "Žluťoučký koníček";$this->assertSame('Zlutoucky konicek', core_text::specialtoascii($str));$utf8 = "Der eine stößt den Speer zum Mann";$iso1 = core_text::convert($utf8, 'utf-8', 'iso-8859-1');$this->assertSame('Der eine stosst den Speer zum Mann', core_text::specialtoascii($utf8));$this->assertSame('Der eine stosst den Speer zum Mann', core_text::specialtoascii($iso1, 'iso-8859-1'));$str = 'àáâãäçèéêëìíîïñòóôõöùúûüýÿÀÁÂÃÄÇÈÉÊËÌÍÎÏÑÒÓÔÕÖÙÚÛÜÝ';$this->assertSame('aaaaaceeeeiiiinooooouuuuyyAAAAACEEEEIIIINOOOOOUUUUY', core_text::specialtoascii($str));$utf8 = 'A æ Übérmensch på høyeste nivå! И я люблю PHP! есть. fi';$this->assertSame('A ae Ubermensch pa hoyeste niva! I a lublu PHP! est\'. fi', core_text::specialtoascii($utf8, 'utf8'));$utf8 = 'キャンパス Αλφαβητικός Κατάλογος Лорем ипсум долор сит амет';$this->assertSame('kyanpasu Alphabetikos Katalogos Lorem ipsum dolor sit amet', core_text::specialtoascii($utf8));// Check that null argument is allowed.$this->assertSame('', core_text::specialtoascii(null));$this->assertSame('', core_text::specialtoascii(null, 'ascii'));}/*** Tests the static encode_mimeheader method.** @covers ::encode_mimeheader()* @covers \moodle_phpmailer::encodeHeader()*/public function test_encode_mimeheader(): void {global $CFG;require_once($CFG->libdir.'/phpmailer/moodle_phpmailer.php');$mailer = new moodle_phpmailer();// Encode short string with non-latin characters.$str = "Žluťoučký koníček";$encodedstr = '=?utf-8?B?xb1sdcWlb3XEjWvDvSBrb27DrcSNZWs=?=';$this->assertSame($encodedstr, core_text::encode_mimeheader($str));$this->assertSame($encodedstr, $mailer->encodeHeader($str));$this->assertSame('"' . $encodedstr . '"', $mailer->encodeHeader($str, 'phrase'));// Encode short string without non-latin characters. Make sure the quotes are escaped in quoted email headers.$latinstr = 'text"with quotes';$this->assertSame($latinstr, core_text::encode_mimeheader($latinstr));$this->assertSame($latinstr, $mailer->encodeHeader($latinstr));$this->assertSame('"text\\"with quotes"', $mailer->encodeHeader($latinstr, 'phrase'));// Encode long string without non-latin characters.$longlatinstr = 'This is a very long text that still should not be split into several lines in the email headers because '.'it does not have any non-latin characters. The "quotes" and \\backslashes should be escaped only if it\'s a part of email address';$this->assertSame($longlatinstr, core_text::encode_mimeheader($longlatinstr));$this->assertSame($longlatinstr, $mailer->encodeHeader($longlatinstr));$longlatinstrwithslash = preg_replace(['/\\\\/', "/\"/"], ['\\\\\\', '\\"'], $longlatinstr);$this->assertSame('"' . $longlatinstrwithslash . '"', $mailer->encodeHeader($longlatinstr, 'phrase'));// Encode long string with non-latin characters.$longstr = "Неопознанная ошибка в файле C:\\tmp\\: \"Не пользуйтесь виндоуз\"";$encodedlongstr = "=?utf-8?B?0J3QtdC+0L/QvtC30L3QsNC90L3QsNGPINC+0YjQuNCx0LrQsCDQsiDRhNCw?==?utf-8?B?0LnQu9C1IEM6XHRtcFw6ICLQndC1INC/0L7Qu9GM0LfRg9C50YLQtdGB?==?utf-8?B?0Ywg0LLQuNC90LTQvtGD0Lci?=";$this->assertSame($encodedlongstr, $mailer->encodeHeader($longstr));$this->assertSame('"' . $encodedlongstr . '"', $mailer->encodeHeader($longstr, 'phrase'));// Check that null argument is allowed.$this->assertSame('', core_text::encode_mimeheader(null));}/*** Tests the static entities_to_utf8 method.** @covers ::entities_to_utf8()*/public function test_entities_to_utf8(): void {$str = "Žluťoučký koníček©"&<>§«";$this->assertSame("Žluťoučký koníček©\"&<>§«", core_text::entities_to_utf8($str));// Check that null argument is allowed.$this->assertSame('', core_text::entities_to_utf8(null));}/*** Tests the static utf8_to_entities method.** @covers ::utf8_to_entities()*/public function test_utf8_to_entities(): void {$str = "Žluťoučký koníček©"&<>§«";$this->assertSame("Žluťoučký koníček©"&<>§«", core_text::utf8_to_entities($str));$this->assertSame("Žluťoučký koníček©"&<>§«", core_text::utf8_to_entities($str, true));$str = "Žluťoučký koníček©"&<>§«";$this->assertSame("Žluťoučký koníček©\"&<>§«", core_text::utf8_to_entities($str, false, true));$this->assertSame("Žluťoučký koníček©\"&<>§«", core_text::utf8_to_entities($str, true, true));// Check that null argument is allowed.$this->assertSame('', core_text::utf8_to_entities(null));$this->assertSame('', core_text::utf8_to_entities(null, true));}/*** Tests the static trim_utf8_bom method.** @covers ::trim_utf8_bom()*/public function test_trim_utf8_bom(): void {$bom = "\xef\xbb\xbf";$str = "Žluťoučký koníček";$this->assertSame($str.$bom, core_text::trim_utf8_bom($bom.$str.$bom));// Check that null argument is allowed.$this->assertSame(null, core_text::trim_utf8_bom(null));}/*** Tests the static remove_unicode_non_characters method.** @covers ::remove_unicode_non_characters()*/public function test_remove_unicode_non_characters(): void {// Confirm that texts which don't contain these characters are unchanged.$this->assertSame('Frogs!', core_text::remove_unicode_non_characters('Frogs!'));// Even if they contain some very scary characters.$example = html_entity_decode('A�𝅘𝅥B', ENT_COMPAT);$this->assertSame($example, core_text::remove_unicode_non_characters($example));// Non-characters are removed wherever they may be, with other characters left.$example = html_entity_decode('ABCD�E', ENT_COMPAT);$expected = html_entity_decode('ABCD�E', ENT_COMPAT);$this->assertSame($expected, core_text::remove_unicode_non_characters($example));// If you only have a non-character, you get empty string.$example = html_entity_decode('', ENT_COMPAT);$this->assertSame('', core_text::remove_unicode_non_characters($example));// Check that null argument is allowed.$this->assertSame(null, core_text::trim_utf8_bom(null));}/*** Tests the static get_encodings method.** @covers ::get_encodings()*/public function test_get_encodings(): void {$encodings = core_text::get_encodings();$this->assertTrue(is_array($encodings));$this->assertTrue(count($encodings) > 1);$this->assertTrue(isset($encodings['UTF-8']));}/*** Tests the static code2utf8 method.** @covers ::code2utf8()*/public function test_code2utf8(): void {$this->assertSame('Ž', core_text::code2utf8(381));}/*** Tests the static utf8ord method.** @covers ::utf8ord()*/public function test_utf8ord(): void {$this->assertSame(ord(''), core_text::utf8ord(''));$this->assertSame(ord('f'), core_text::utf8ord('f'));$this->assertSame(0x03B1, core_text::utf8ord('α'));$this->assertSame(0x0439, core_text::utf8ord('й'));$this->assertSame(0x2FA1F, core_text::utf8ord('𯨟'));$this->assertSame(381, core_text::utf8ord('Ž'));// Check that null argument is allowed.$this->assertSame(ord(''), core_text::utf8ord(null));}/*** Tests the static strtotitle method.** @covers ::strtotitle()*/public function test_strtotitle(): void {$str = "žluťoučký koníček";$this->assertSame("Žluťoučký Koníček", core_text::strtotitle($str));// Check that null argument is allowed.$this->assertSame(null, core_text::strtotitle(null));}/*** Test strrchr.** @covers ::strrchr()*/public function test_strrchr(): void {$str = "Žluťoučký koníček";$this->assertSame('koníček', core_text::strrchr($str, 'koní'));$this->assertSame('Žluťoučký ', core_text::strrchr($str, 'koní', true));$this->assertFalse(core_text::strrchr($str, 'A'));$this->assertFalse(core_text::strrchr($str, 'ç', true));// Check that null argument is allowed.$this->assertSame(false, core_text::strrchr(null, 'o'));}/*** Tests the static checker is_charset_supported** @dataProvider is_charset_supported_provider()* @param string $charset* @param bool $expected* @covers ::is_charset_supported()*/public function test_is_charset_supported(string $charset, bool $expected): void {$charset = core_text::parse_charset($charset);$this->assertEquals($expected, core_text::is_charset_supported($charset));}/*** Provider for the test_is_charset_supported()* @return array[]*/public function is_charset_supported_provider() {return ["Check unsupported windows charset" => ["cp1250", false],"Check supported windows charset" => ["cp1252", true]];}}