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✏️ Editing: weblib_test.php

<?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/>.

/**
 * Weblib tests.
 *
 * @package    core
 * @category   phpunit
 * @copyright  &copy; 2006 The Open University
 * @author     T.J.Hunt@open.ac.uk
 * @license    http://www.gnu.org/copyleft/gpl.html GNU Public License
 */
class weblib_test extends advanced_testcase {
    /**
     * @covers ::s
     */
    public function test_s() {
        // Special cases.
        $this->assertSame('0', s(0));
        $this->assertSame('0', s('0'));
        $this->assertSame('0', s(false));
        $this->assertSame('', s(null));

// Normal cases.
 $this->assertSame('This Breaks &quot; Strict', s('This Breaks " Strict'));
 $this->assertSame('This Breaks &lt;a&gt;&quot; Strict&lt;/a&gt;', s('This Breaks <a>" Strict</a>'));

// Unicode characters.
        $this->assertSame('Café', s('Café'));
        $this->assertSame('一, 二, 三', s('一, 二, 三'));

// Don't escape already-escaped numeric entities. (Note, this behaviour
        // may not be desirable. Perhaps we should remove these tests and that
        // functionality, but we can only do that if we understand why it was added.)
        $this->assertSame('An entity: &#x09ff;.', s('An entity: &#x09ff;.'));
        $this->assertSame('An entity: &#1073;.', s('An entity: &#1073;.'));
        $this->assertSame('An entity: &amp;amp;.', s('An entity: &amp;.'));
        $this->assertSame('Not an entity: &amp;amp;#x09ff;.', s('Not an entity: &amp;#x09ff;.'));

// Test all ASCII characters (0-127).
 for ($i = 0; $i <= 127; $i++) {
 $character = chr($i);
 $result = s($character);
 switch ($character) {
 case '"' :
 $this->assertSame('&quot;', $result);
 break;
 case '&' :
 $this->assertSame('&amp;', $result);
 break;
 case "'" :
 $this->assertSame('&#039;', $result);
 break;
 case '<' :
 $this->assertSame('&lt;', $result);
 break;
 case '>' :
 $this->assertSame('&gt;', $result);
 break;
 default:
 $this->assertSame($character, $result);
 break;
 }
 }
 }

/**
     * Test the format_string illegal options handling.
     *
     * @covers ::format_string
     * @dataProvider format_string_illegal_options_provider
     */
    public function test_format_string_illegal_options(
        string $input,
        string $result,
        mixed $options,
        string $pattern,
    ): void {
        $this->assertEquals(
            $result,
            format_string($input, false, $options),
        );

$messages = $this->getDebuggingMessages();
        $this->assertdebuggingcalledcount(1);
        $this->assertMatchesRegularExpression(
            "/{$pattern}/",
            $messages[0]->message,
        );
    }

/**
     * Data provider for test_format_string_illegal_options.
     * @return array
     */
    public static function format_string_illegal_options_provider(): array {
        return [
            [
                'Example',
                'Example',
                \core\context\system::instance(),
                preg_quote('The options argument should not be a context object directly.'),
            ],
            [
                'Example',
                'Example',
                true,
                preg_quote('The options argument should be an Array, or stdclass. boolean passed.'),
            ],
            [
                'Example',
                'Example',
                false,
                preg_quote('The options argument should be an Array, or stdclass. boolean passed.'),
            ],
        ];
    }

/**
     * Ensure that if format_string is called with a context as the third param, that a debugging notice is emitted.
     *
     * @covers ::format_string
     */
    public function test_format_string_context(): void {
        global $CFG;

$this->resetAfterTest(true);

// Disable the formatstringstriptags option to ensure that the HTML tags are not stripped.
        $CFG->stringfilters = 'multilang';

// Enable filters.
        $CFG->filterall = true;

$course = $this->getDataGenerator()->create_course();
        $coursecontext = \core\context\course::instance($course->id);

// Set up the multilang filter at the system context, but disable it at the course.
        filter_set_global_state('multilang', TEXTFILTER_ON);
        filter_set_local_state('multilang', $coursecontext->id, TEXTFILTER_OFF);

// Previously, if a context was passed, it was converted into an Array, and ignored.
 // The PAGE context was used instead -- often this is the system context.
 $input = 'I really do not do not like this!';

$result = format_string(
            $input,
            true,
            $coursecontext,
        );

// We emit a debugging notice to alert that the context has been moved to the options.
        $this->assertdebuggingcalledcount(1);

// Check the result was _not_ filtered.
        $this->assertEquals(
            // Tags are stripped out due to striptags.
            "I really do not do not like this!",
            $result,
        );

// But it should be filtered if called with the system context.
        $result = format_string(
            $input,
            true,
            ['context' => \core\context\system::instance()],
        );
        $this->assertEquals(
            'I really do not like this!',
            $result,
        );
    }

/**
 * @covers ::format_text_email
 */
 public function test_format_text_email() {
 $this->assertSame("This is a TEST\n",
 format_text_email('This is a test', FORMAT_HTML));
 $this->assertSame("This is a TEST\n",
 format_text_email('This is a test', FORMAT_HTML));
 $this->assertSame('& so is this',
 format_text_email('&amp; so is this', FORMAT_HTML));
 $this->assertSame('Two bullets: ' . core_text::code2utf8(8226) . ' ' . core_text::code2utf8(8226),
 format_text_email('Two bullets: &#x2022; &#8226;', FORMAT_HTML));
 $this->assertSame(core_text::code2utf8(0x7fd2).core_text::code2utf8(0x7fd2),
 format_text_email('&#x7fd2;&#x7FD2;', FORMAT_HTML));
 }

/**
     * @covers ::obfuscate_email
     */
    public function test_obfuscate_email() {
        $email = 'some.user@example.com';
        $obfuscated = obfuscate_email($email);
        $this->assertNotSame($email, $obfuscated);
        $back = core_text::entities_to_utf8(urldecode($email), true);
        $this->assertSame($email, $back);
    }

/**
     * @covers ::obfuscate_text
     */
    public function test_obfuscate_text() {
        $text = 'Žluťoučký koníček 32131';
        $obfuscated = obfuscate_text($text);
        $this->assertNotSame($text, $obfuscated);
        $back = core_text::entities_to_utf8($obfuscated, true);
        $this->assertSame($text, $back);
    }

/**
 * @covers ::highlight
 */
 public function test_highlight() {
 $this->assertSame('This is good',
 highlight('good', 'This is good'));

$this->assertSame('span',
 highlight('SpaN', 'span'));

$this->assertSame('SpaN',
 highlight('span', 'SpaN'));

$this->assertSame('span',
 highlight('span', 'span'));

$this->assertSame('He is good',
 highlight('good is', 'He is good'));

$this->assertSame('This is good',
 highlight('+good', 'This is good'));

$this->assertSame('This is good',
                highlight('-good', 'This is good'));

$this->assertSame('This is goodness',
                highlight('+good', 'This is goodness'));

$this->assertSame('This is goodness',
 highlight('good', 'This is goodness'));

$this->assertSame('test 11',
 highlight('test 1', 'test 11', false, '', ''));

$this->assertSame('test 11',
 highlight('test +1', 'test 11', false, '', ''));

$this->assertSame('test 11',
 highlight('test -1', 'test 11', false, '', ''));
 }

/**
     * @covers ::replace_ampersands_not_followed_by_entity
     */
    public function test_replace_ampersands() {
        $this->assertSame("This &amp; that &nbsp;", replace_ampersands_not_followed_by_entity("This & that &nbsp;"));
        $this->assertSame("This &amp;nbsp that &nbsp;", replace_ampersands_not_followed_by_entity("This &nbsp that &nbsp;"));
    }

/**
 * @covers ::strip_links
 */
 public function test_strip_links() {
 $this->assertSame('this is a link', strip_links('this is a <a href="http://someaddress.com/query">link</a>'));
 }

/**
 * @covers ::wikify_links
 */
 public function test_wikify_links() {
 $this->assertSame('this is a link [ http://someaddress.com/query ]', wikify_links('this is a <a href="http://someaddress.com/query">link</a>'));
 }

/**
 * @covers ::clean_text
 */
 public function test_clean_text() {
 $text = "lala <applet>xx</applet>";
 $this->assertSame($text, clean_text($text, FORMAT_PLAIN));
 $this->assertSame('lala xx', clean_text($text, FORMAT_MARKDOWN));
 $this->assertSame('lala xx', clean_text($text, FORMAT_MOODLE));
 $this->assertSame('lala xx', clean_text($text, FORMAT_HTML));
 }

/**
     * Test trusttext enabling.
     *
     * @covers ::trusttext_active
     */
    public function test_trusttext_active() {
        global $CFG;
        $this->resetAfterTest();

$this->assertFalse(trusttext_active());
        $CFG->enabletrusttext = '1';
        $this->assertTrue(trusttext_active());
    }

/**
     * Test trusttext detection.
     *
     * @covers ::trusttext_trusted
     */
    public function test_trusttext_trusted() {
        global $CFG;
        $this->resetAfterTest();

$syscontext = context_system::instance();
        $course = $this->getDataGenerator()->create_course();
        $coursecontext = context_course::instance($course->id);
        $user1 = $this->getDataGenerator()->create_user();
        $user2 = $this->getDataGenerator()->create_user();
        $this->getDataGenerator()->enrol_user($user2->id, $course->id, 'editingteacher');

$this->setAdminUser();

$CFG->enabletrusttext = '0';
        $this->assertFalse(trusttext_trusted($syscontext));
        $this->assertFalse(trusttext_trusted($coursecontext));

$CFG->enabletrusttext = '1';
        $this->assertTrue(trusttext_trusted($syscontext));
        $this->assertTrue(trusttext_trusted($coursecontext));

$this->setUser($user1);

$CFG->enabletrusttext = '0';
        $this->assertFalse(trusttext_trusted($syscontext));
        $this->assertFalse(trusttext_trusted($coursecontext));

$CFG->enabletrusttext = '1';
        $this->assertFalse(trusttext_trusted($syscontext));
        $this->assertFalse(trusttext_trusted($coursecontext));

$this->setUser($user2);

$CFG->enabletrusttext = '0';
        $this->assertFalse(trusttext_trusted($syscontext));
        $this->assertFalse(trusttext_trusted($coursecontext));

$CFG->enabletrusttext = '1';
        $this->assertFalse(trusttext_trusted($syscontext));
        $this->assertTrue(trusttext_trusted($coursecontext));
    }

/**
     * Data provider for trusttext_pre_edit() tests.
     */
    public function trusttext_pre_edit_provider(): array {
        return [
            [true, 0, 'editingteacher', FORMAT_HTML, 1],
            [true, 0, 'editingteacher', FORMAT_MOODLE, 1],
            [false, 0, 'editingteacher', FORMAT_MARKDOWN, 1],
            [false, 0, 'editingteacher', FORMAT_PLAIN, 1],

[false, 1, 'editingteacher', FORMAT_HTML, 1],
            [false, 1, 'editingteacher', FORMAT_MOODLE, 1],
            [false, 1, 'editingteacher', FORMAT_MARKDOWN, 1],
            [false, 1, 'editingteacher', FORMAT_PLAIN, 1],

[true, 0, 'student', FORMAT_HTML, 1],
            [true, 0, 'student', FORMAT_MOODLE, 1],
            [false, 0, 'student', FORMAT_MARKDOWN, 1],
            [false, 0, 'student', FORMAT_PLAIN, 1],

[true, 1, 'student', FORMAT_HTML, 1],
            [true, 1, 'student', FORMAT_MOODLE, 1],
            [false, 1, 'student', FORMAT_MARKDOWN, 1],
            [false, 1, 'student', FORMAT_PLAIN, 1],
        ];
    }

/**
     * Test text cleaning before editing.
     *
     * @dataProvider trusttext_pre_edit_provider
     * @covers ::trusttext_pre_edit
     *
     * @param bool $expectedsanitised
     * @param int $enabled
     * @param string $rolename
     * @param string $format
     * @param int $trust
     */
    public function test_trusttext_pre_edit(bool $expectedsanitised, int $enabled, string $rolename,
                                            string $format, int $trust) {
        global $CFG, $DB;
        $this->resetAfterTest();

$exploit = "abc<script>alert('xss')</script> < > &";
 $sanitised = purify_html($exploit);

$course = $this->getDataGenerator()->create_course();
        $context = context_course::instance($course->id);

$user = $this->getDataGenerator()->create_user();
        $this->getDataGenerator()->enrol_user($user->id, $course->id, $rolename);

$this->setUser($user);

$CFG->enabletrusttext = (string)$enabled;

$object = new stdClass();
        $object->some = $exploit;
        $object->someformat = $format;
        $object->sometrust = (string)$trust;
        $result = trusttext_pre_edit(clone($object), 'some', $context);

if ($expectedsanitised) {
            $message = "sanitisation is expected for: $enabled, $rolename, $format, $trust";
            $this->assertSame($sanitised, $result->some, $message);
        } else {
            $message = "sanitisation is not expected for: $enabled, $rolename, $format, $trust";
            $this->assertSame($exploit, $result->some, $message);
        }
    }

/**
     * Test removal of legacy trusttext flag.
     * @covers ::trusttext_strip
     */
    public function test_trusttext_strip() {
        $this->assertSame('abc', trusttext_strip('abc'));
        $this->assertSame('abc', trusttext_strip('ab#####TRUSTTEXT#####c'));
    }

/**
     * Test trust option of format_text().
     * @covers ::format_text
     */
    public function test_format_text_trusted() {
        global $CFG;
        $this->resetAfterTest();

$text = "lala <object>xx</object>";

$CFG->enabletrusttext = 0;

$this->assertSame(s($text),
 format_text($text, FORMAT_PLAIN, ['trusted' => true]));
 $this->assertSame("lala xx\n",
 format_text($text, FORMAT_MARKDOWN, ['trusted' => true]));
 $this->assertSame('<div class="text_to_html">lala xx</div>',
 format_text($text, FORMAT_MOODLE, ['trusted' => true]));
 $this->assertSame('lala xx',
 format_text($text, FORMAT_HTML, ['trusted' => true]));

$this->assertSame(s($text),
 format_text($text, FORMAT_PLAIN, ['trusted' => false]));
 $this->assertSame("lala xx\n",
 format_text($text, FORMAT_MARKDOWN, ['trusted' => false]));
 $this->assertSame('<div class="text_to_html">lala xx</div>',
 format_text($text, FORMAT_MOODLE, ['trusted' => false]));
 $this->assertSame('lala xx',
 format_text($text, FORMAT_HTML, ['trusted' => false]));

$CFG->enabletrusttext = 1;

$this->assertSame(s($text),
 format_text($text, FORMAT_PLAIN, ['trusted' => true]));
 $this->assertSame("lala xx\n",
 format_text($text, FORMAT_MARKDOWN, ['trusted' => true]));
 $this->assertSame('<div class="text_to_html">lala <object>xx</object></div>',
 format_text($text, FORMAT_MOODLE, ['trusted' => true]));
 $this->assertSame('lala <object>xx</object>',
 format_text($text, FORMAT_HTML, ['trusted' => true]));

$this->assertSame("lala <object>xx</object>\n",
 format_text($text, FORMAT_MARKDOWN, ['trusted' => true, 'noclean' => true]));
 $this->assertSame("lala <object>xx</object>\n",
 format_text($text, FORMAT_MARKDOWN, ['trusted' => false, 'noclean' => true]));
 }

/**
     * @covers ::qualified_me
     */
    public function test_qualified_me() {
        global $PAGE, $FULLME, $CFG;
        $this->resetAfterTest();

$PAGE = new moodle_page();

$FULLME = $CFG->wwwroot.'/course/view.php?id=1&xx=yy';
        $this->assertSame($FULLME, qualified_me());

$PAGE->set_url('/course/view.php', array('id'=>1));
        $this->assertSame($CFG->wwwroot.'/course/view.php?id=1', qualified_me());
    }

/**
     * @covers \null_progress_trace
     */
    public function test_null_progress_trace() {
        $this->resetAfterTest(false);

$trace = new null_progress_trace();
        $trace->output('do');
        $trace->output('re', 1);
        $trace->output('mi', 2);
        $trace->finished();
        $output = ob_get_contents();
        $this->assertSame('', $output);
        $this->expectOutputString('');
    }

/**
     * @covers \null_progress_trace
     */
    public function test_text_progress_trace() {
        $this->resetAfterTest(false);

$trace = new text_progress_trace();
        $trace->output('do');
        $trace->output('re', 1);
        $trace->output('mi', 2);
        $trace->finished();
        $this->expectOutputString("do\n  re\n    mi\n");
    }

/**
     * @covers \html_progress_trace
     */
    public function test_html_progress_trace() {
        $this->resetAfterTest(false);

$trace = new html_progress_trace();
 $trace->output('do');
 $trace->output('re', 1);
 $trace->output('mi', 2);
 $trace->finished();
 $this->expectOutputString("do\n&#160;&#160;re\n&#160;&#160;&#160;&#160;mi\n");
 }

/**
     * @covers \html_list_progress_trace
     */
    public function test_html_list_progress_trace() {
        $this->resetAfterTest(false);

$trace = new html_list_progress_trace();
 $trace->output('do');
 $trace->output('re', 1);
 $trace->output('mi', 2);
 $trace->finished();
 $this->expectOutputString("<ul>\n<li>do<ul>\n<li>re<ul>\n<li>mi</li>\n</ul>\n</li>\n</ul>\n</li>\n</ul>\n");
 }

/**
     * @covers \progress_trace_buffer
     */
    public function test_progress_trace_buffer() {
        $this->resetAfterTest(false);

$trace = new progress_trace_buffer(new html_progress_trace());
 ob_start();
 $trace->output('do');
 $trace->output('re', 1);
 $trace->output('mi', 2);
 $trace->finished();
 $output = ob_get_contents();
 ob_end_clean();
 $this->assertSame("do\n&#160;&#160;re\n&#160;&#160;&#160;&#160;mi\n", $output);
 $this->assertSame($output, $trace->get_buffer());

$trace = new progress_trace_buffer(new html_progress_trace(), false);
 $trace->output('do');
 $trace->output('re', 1);
 $trace->output('mi', 2);
 $trace->finished();
 $this->assertSame("do\n&#160;&#160;re\n&#160;&#160;&#160;&#160;mi\n", $trace->get_buffer());
 $this->assertSame("do\n&#160;&#160;re\n&#160;&#160;&#160;&#160;mi\n", $trace->get_buffer());
 $trace->reset_buffer();
 $this->assertSame('', $trace->get_buffer());
 $this->expectOutputString('');
 }

/**
     * @covers \combined_progress_trace
     */
    public function test_combined_progress_trace() {
        $this->resetAfterTest(false);

$trace1 = new progress_trace_buffer(new html_progress_trace(), false);
        $trace2 = new progress_trace_buffer(new text_progress_trace(), false);

$trace = new combined_progress_trace(array($trace1, $trace2));
 $trace->output('do');
 $trace->output('re', 1);
 $trace->output('mi', 2);
 $trace->finished();
 $this->assertSame("do\n&#160;&#160;re\n&#160;&#160;&#160;&#160;mi\n", $trace1->get_buffer());
 $this->assertSame("do\n re\n mi\n", $trace2->get_buffer());
 $this->expectOutputString('');
 }

/**
     * @covers ::set_debugging
     */
    public function test_set_debugging() {
        global $CFG;

$this->resetAfterTest();

$this->assertEquals(DEBUG_DEVELOPER, $CFG->debug);
        $this->assertTrue($CFG->debugdeveloper);
        $this->assertNotEmpty($CFG->debugdisplay);

set_debugging(DEBUG_DEVELOPER, true);
        $this->assertEquals(DEBUG_DEVELOPER, $CFG->debug);
        $this->assertTrue($CFG->debugdeveloper);
        $this->assertNotEmpty($CFG->debugdisplay);

set_debugging(DEBUG_DEVELOPER, false);
        $this->assertEquals(DEBUG_DEVELOPER, $CFG->debug);
        $this->assertTrue($CFG->debugdeveloper);
        $this->assertEmpty($CFG->debugdisplay);

set_debugging(-1);
        $this->assertEquals(-1, $CFG->debug);
        $this->assertTrue($CFG->debugdeveloper);

set_debugging(DEBUG_ALL);
        $this->assertEquals(DEBUG_ALL, $CFG->debug);
        $this->assertFalse($CFG->debugdeveloper);

set_debugging(DEBUG_NORMAL);
        $this->assertEquals(DEBUG_NORMAL, $CFG->debug);
        $this->assertFalse($CFG->debugdeveloper);

set_debugging(DEBUG_MINIMAL);
        $this->assertEquals(DEBUG_MINIMAL, $CFG->debug);
        $this->assertFalse($CFG->debugdeveloper);

set_debugging(DEBUG_NONE);
        $this->assertEquals(DEBUG_NONE, $CFG->debug);
        $this->assertFalse($CFG->debugdeveloper);
    }

/**
 * @covers ::strip_pluginfile_content
 */
 public function test_strip_pluginfile_content() {
 $source = <<<SOURCE
Hello!

I'm writing to you from the Moodle Majlis in Muscat, Oman, where we just had several days of Moodle community goodness.

URL outside a tag: https://moodle.org/logo/logo-240x60.gif
Plugin url outside a tag: @@PLUGINFILE@@/logo-240x60.gif

External link 1:<img src='https://moodle.org/logo/logo-240x60.gif' alt='Moodle'/>
External link 2:<img alt="Moodle" src="https://moodle.org/logo/logo-240x60.gif"/>
Internal link 1:<img src='@@PLUGINFILE@@/logo-240x60.gif' alt='Moodle'/>
Internal link 2:<img alt="Moodle" src="@@PLUGINFILE@@logo-240x60.gif"/>
Anchor link 1:<a href="@@PLUGINFILE@@logo-240x60.gif" alt="bananas">Link text</a>
Anchor link 2:<a title="bananas" href="../logo-240x60.gif">Link text</a>
Anchor + ext. img:<a title="bananas" href="../logo-240x60.gif"><img alt="Moodle" src="@@PLUGINFILE@@logo-240x60.gif"/></a>
Ext. anchor + img:<a href="@@PLUGINFILE@@logo-240x60.gif"><img alt="Moodle" src="https://moodle.org/logo/logo-240x60.gif"/></a>
SOURCE;
 $expected = <<<EXPECTED
Hello!

I'm writing to you from the Moodle Majlis in Muscat, Oman, where we just had several days of Moodle community goodness.

URL outside a tag: https://moodle.org/logo/logo-240x60.gif
Plugin url outside a tag: @@PLUGINFILE@@/logo-240x60.gif

External link 1:<img src="https://moodle.org/logo/logo-240x60.gif" alt="Moodle" />
External link 2:<img alt="Moodle" src="https://moodle.org/logo/logo-240x60.gif" />
Internal link 1:
Internal link 2:
Anchor link 1:Link text
Anchor link 2:<a title="bananas" href="../logo-240x60.gif">Link text</a>
Anchor + ext. img:<a title="bananas" href="../logo-240x60.gif"></a>
Ext. anchor + img:<img alt="Moodle" src="https://moodle.org/logo/logo-240x60.gif" />
EXPECTED;
 $this->assertSame($expected, strip_pluginfile_content($source));
 }

/**
     * @covers \purify_html
     */
    public function test_purify_html_ruby() {

$this->resetAfterTest();

$ruby =
 "<ruby><rb>京都</rb><rp>(</rp><rt>きょうと</rt><rp>)</rp></ruby>は" .
 "<ruby><rb>日本</rb><rp>(</rp><rt>にほん</rt><rp>)</rp></ruby>の" .
 "<ruby><rb>都</rb><rp>(</rp><rt>みやこ</rt><rp>)</rp></ruby>です。";
 $illegal = '<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>';

$cleaned = purify_html($ruby . $illegal);
        $this->assertEquals($ruby, $cleaned);

}

/**
     * Tests for content_to_text.
     *
     * @param string    $content   The content
     * @param int|false $format    The content format
     * @param string    $expected  Expected value
     * @dataProvider provider_content_to_text
     * @covers ::content_to_text
     */
    public function test_content_to_text($content, $format, $expected) {
        $content = content_to_text($content, $format);
        $this->assertEquals($expected, $content);
    }

/**
 * Data provider for test_content_to_text.
 */
 public static function provider_content_to_text() {
 return array(
 array('asd', false, 'asd'),
 // Trim '\r\n '.
 array("Note that:\n\n3 > 1 ", FORMAT_PLAIN, "Note that:\n\n3 > 1"),
 array("Note that:\n\n3 > 1\r\n", FORMAT_PLAIN, "Note that:\n\n3 > 1"),
 // Multiple spaces to one.
 array('京都 -> hehe', FORMAT_HTML, '京都 -> hehe'),
 array('京都 -> hehe', false, '京都 -> hehe'),
 array('asd asd', false, 'asd asd'),
 // From markdown to html and html to text.
 array('asd __lera__ con la', FORMAT_MARKDOWN, 'asd LERA con la'),
 // HTML to text.
 array('This is a test', FORMAT_HTML, 'This is a TEST'),
 array("english
català
español
français", FORMAT_HTML, "english català español français")
 );
 }

/**
     * Data provider for validate_email() function.
     *
     * @return array Returns aray of test data for the test_validate_email function
     */
    public function data_validate_email() {
        return [
            // Test addresses that should pass.
            [
                'email' => 'moodle@example.com',
                'result' => true
            ],
            [
                'email' => 'moodle@localhost.local',
                'result' => true
            ],
            [
                'email' => 'verp_email+is=mighty@moodle.org',
                'result' => true
            ],
            [
                'email' => "but_potentially'dangerous'too@example.org",
                'result' => true
            ],
            [
                'email' => 'posts+AAAAAAAAAAIAAAAAAAAGQQAAAAABFSXz1eM/P/lR2bYyljM+@posts.moodle.org',
                'result' => true
            ],

// Test addresses that should NOT pass.
 [
 'email' => 'moodle@localhost',
 'result' => false
 ],
 [
 'email' => '"attacker\\" -oQ/tmp/ -X/var/www/vhost/moodle/backdoor.php some"@email.com',
 'result' => false
 ],
 [
 'email' => "moodle@example.com>\r\nRCPT TO:<victim@example.com",
 'result' => false
 ],
 [
 'email' => 'greater>than@example.com',
 'result' => false
 ],
 [
 'email' => 'less<than@example.com',
 'result' => false
 ],
 [
 'email' => '"this<is>validbutwerejectit"@example.com',
 'result' => false
 ],

// Empty e-mail addresess are not valid.
            [
                'email' => '',
                'result' => false,
            ],
            [
                'email' => null,
                'result' => false,
            ],
            [
                'email' => false,
                'result' => false,
            ],

// Extra email addresses from Wikipedia page on Email Addresses.
            // Valid.
            [
                'email' => 'simple@example.com',
                'result' => true
            ],
            [
                'email' => 'very.common@example.com',
                'result' => true
            ],
            [
                'email' => 'disposable.style.email.with+symbol@example.com',
                'result' => true
            ],
            [
                'email' => 'other.email-with-hyphen@example.com',
                'result' => true
            ],
            [
                'email' => 'fully-qualified-domain@example.com',
                'result' => true
            ],
            [
                'email' => 'user.name+tag+sorting@example.com',
                'result' => true
            ],
            // One-letter local-part.
            [
                'email' => 'x@example.com',
                'result' => true
            ],
            [
                'email' => 'example-indeed@strange-example.com',
                'result' => true
            ],
            // See the List of Internet top-level domains.
            [
                'email' => 'example@s.example',
                'result' => true
            ],
            // Quoted double dot.
            [
                'email' => '"john..doe"@example.org',
                'result' => true
            ],

// Invalid.
 // No @ character.
 [
 'email' => 'Abc.example.com',
 'result' => false
 ],
 // Only one @ is allowed outside quotation marks.
 [
 'email' => 'A@b@c@example.com',
 'result' => false
 ],
 // None of the special characters in this local-part are allowed outside quotation marks.
 [
 'email' => 'a"b(c)d,e:f;g<h>i[j\k]l@example.com',
 'result' => false
 ],
 // Quoted strings must be dot separated or the only element making up the local-part.
 [
 'email' => 'just"not"right@example.com',
 'result' => false
 ],
 // Spaces, quotes, and backslashes may only exist when within quoted strings and preceded by a backslash.
 [
 'email' => 'this is"not\allowed@example.com',
 'result' => false
 ],
 // Even if escaped (preceded by a backslash), spaces, quotes, and backslashes must still be contained by quotes.
 [
 'email' => 'this\ still\"not\\allowed@example.com',
 'result' => false
 ],
 // Local part is longer than 64 characters.
 [
 'email' => '1234567890123456789012345678901234567890123456789012345678901234+x@example.com',
 'result' => false
 ],
 ];
 }

/**
     * Tests valid and invalid email address using the validate_email() function.
     *
     * @param string $email the email address to test
     * @param boolean $result Expected result (true or false)
     * @dataProvider    data_validate_email
     * @covers ::validate_email
     */
    public function test_validate_email($email, $result) {
        if ($result) {
            $this->assertTrue(validate_email($email));
        } else {
            $this->assertFalse(validate_email($email));
        }
    }

/**
     * Data provider for test_get_file_argument.
     */
    public static function provider_get_file_argument() {
        return array(
            // Serving SCORM content w/o HTTP GET params.
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php/3854/mod_scorm/content/1/swf.html',
                    'SCRIPT_NAME' => '/pluginfile.php',
                    'PATH_INFO' => '/3854/mod_scorm/content/1/swf.html',
                ), 0, '/3854/mod_scorm/content/1/swf.html'),
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php/3854/mod_scorm/content/1/swf.html',
                    'SCRIPT_NAME' => '/pluginfile.php',
                    'PATH_INFO' => '/3854/mod_scorm/content/1/swf.html',
                ), 1, '/3854/mod_scorm/content/1/swf.html'),
            // Serving SCORM content w/ HTTP GET 'file' as first param.
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php/3854/mod_scorm/content/1/swf.html?file=video_.swf',
                    'SCRIPT_NAME' => '/pluginfile.php',
                    'PATH_INFO' => '/3854/mod_scorm/content/1/swf.html',
                ), 0, '/3854/mod_scorm/content/1/swf.html'),
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php/3854/mod_scorm/content/1/swf.html?file=video_.swf',
                    'SCRIPT_NAME' => '/pluginfile.php',
                    'PATH_INFO' => '/3854/mod_scorm/content/1/swf.html',
                ), 1, '/3854/mod_scorm/content/1/swf.html'),
            // Serving SCORM content w/ HTTP GET 'file' not as first param.
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php/3854/mod_scorm/content/1/swf.html?foo=bar&file=video_.swf',
                    'SCRIPT_NAME' => '/pluginfile.php',
                    'PATH_INFO' => '/3854/mod_scorm/content/1/swf.html',
                ), 0, '/3854/mod_scorm/content/1/swf.html'),
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php/3854/mod_scorm/content/1/swf.html?foo=bar&file=video_.swf',
                    'SCRIPT_NAME' => '/pluginfile.php',
                    'PATH_INFO' => '/3854/mod_scorm/content/1/swf.html',
                ), 1, '/3854/mod_scorm/content/1/swf.html'),
            // Serving content from a generic activity w/ HTTP GET 'file', still forcing slash arguments.
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php/3854/whatever/content/1/swf.html?file=video_.swf',
                    'SCRIPT_NAME' => '/pluginfile.php',
                    'PATH_INFO' => '/3854/whatever/content/1/swf.html',
                ), 0, '/3854/whatever/content/1/swf.html'),
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php/3854/whatever/content/1/swf.html?file=video_.swf',
                    'SCRIPT_NAME' => '/pluginfile.php',
                    'PATH_INFO' => '/3854/whatever/content/1/swf.html',
                ), 1, '/3854/whatever/content/1/swf.html'),
            // Serving content from a generic activity w/ HTTP GET 'file', still forcing slash arguments (edge case).
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php/?file=video_.swf',
                    'SCRIPT_NAME' => '/pluginfile.php',
                    'PATH_INFO' => '/',
                ), 0, 'video_.swf'),
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php/?file=video_.swf',
                    'SCRIPT_NAME' => '/pluginfile.php',
                    'PATH_INFO' => '/',
                ), 1, 'video_.swf'),
            // Serving content from a generic activity w/ HTTP GET 'file', w/o forcing slash arguments.
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php?file=%2F3854%2Fwhatever%2Fcontent%2F1%2Fswf.html%3Ffile%3Dvideo_.swf',
                    'SCRIPT_NAME' => '/pluginfile.php',
                ), 0, '/3854/whatever/content/1/swf.html?file=video_.swf'),
            array(array(
                    'SERVER_SOFTWARE' => 'Apache',
                    'SERVER_PORT' => '80',
                    'REQUEST_METHOD' => 'GET',
                    'REQUEST_URI' => '/pluginfile.php?file=%2F3854%2Fwhatever%2Fcontent%2F1%2Fswf.html%3Ffile%3Dvideo_.swf',
                    'SCRIPT_NAME' => '/pluginfile.php',
                ), 1, '/3854/whatever/content/1/swf.html?file=video_.swf'),
        );
    }

/**
     * Tests for get_file_argument() function.
     *
     * @param array $server mockup for $_SERVER.
     * @param string $cfgslasharguments slasharguments setting.
     * @param string|false $expected Expected value.
     * @dataProvider provider_get_file_argument
     * @covers ::get_file_argument
     */
    public function test_get_file_argument($server, $cfgslasharguments, $expected) {
        global $CFG;

// Overwrite the related settings.
        $currentsetting = $CFG->slasharguments;
        $CFG->slasharguments = $cfgslasharguments;
        // Mock global $_SERVER.
        $currentserver = isset($_SERVER) ? $_SERVER : null;
        $_SERVER = $server;
        initialise_fullme();
        if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
            $this->fail('Only HTTP GET mocked request allowed.');
        }
        if (empty($_SERVER['REQUEST_URI'])) {
            $this->fail('Invalid HTTP GET mocked request.');
        }
        // Mock global $_GET.
        $currentget = isset($_GET) ? $_GET : null;
        $_GET = array();
        $querystring = parse_url($_SERVER['REQUEST_URI'], PHP_URL_QUERY);
        if (!empty($querystring)) {
            $_SERVER['QUERY_STRING'] = $querystring;
            parse_str($querystring, $_GET);
        }

$this->assertEquals($expected, get_file_argument());

// Restore the current settings and global values.
        $CFG->slasharguments = $currentsetting;
        if (is_null($currentserver)) {
            unset($_SERVER);
        } else {
            $_SERVER = $currentserver;
        }
        if (is_null($currentget)) {
            unset($_GET);
        } else {
            $_GET = $currentget;
        }
    }

/**
     * Tests for extract_draft_file_urls_from_text() function.
     *
     * @covers ::extract_draft_file_urls_from_text
     */
    public function test_extract_draft_file_urls_from_text() {
        global $CFG;

$url1 = "{$CFG->wwwroot}/draftfile.php/5/user/draft/99999999/test1.jpg";
        $url2 = "{$CFG->wwwroot}/draftfile.php/5/user/draft/99999998/test2.jpg";

$html = "This is a test.<img src=\"{$url1}\" alt=\"\">
 Test content.<img src=\"{$url2}\" alt=\"\" width=\"2048\" height=\"1536\"
 class=\"img-fluid atto_image_button_text-bottom\"> ";
 $draftareas = array(
 array(
 'urlbase' => 'draftfile.php',
 'contextid' => '5',
 'component' => 'user',
 'filearea' => 'draft',
 'itemid' => '99999999',
 'filename' => 'test1.jpg',
 0 => "{$CFG->wwwroot}/draftfile.php/5/user/draft/99999999/test1.jpg",
 1 => 'draftfile.php',
 2 => '5',
 3 => 'user',
 4 => 'draft',
 5 => '99999999',
 6 => 'test1.jpg'
 ),
 array(
 'urlbase' => 'draftfile.php',
 'contextid' => '5',
 'component' => 'user',
 'filearea' => 'draft',
 'itemid' => '99999998',
 'filename' => 'test2.jpg',
 0 => "{$CFG->wwwroot}/draftfile.php/5/user/draft/99999998/test2.jpg",
 1 => 'draftfile.php',
 2 => '5',
 3 => 'user',
 4 => 'draft',
 5 => '99999998',
 6 => 'test2.jpg'
 )
 );
 $extracteddraftareas = extract_draft_file_urls_from_text($html, false, 5, 'user', 'draft');
 $this->assertEquals($draftareas, $extracteddraftareas);
 }

/**
     * @covers ::print_password_policy
     */
    public function test_print_password_policy() {
        $this->resetAfterTest(true);
        global $CFG;

$policydisabled = '';

// Set password policy to disabled.
        $CFG->passwordpolicy = false;

// Check for empty response.
        $this->assertEquals($policydisabled, print_password_policy());

// Now set the policy to enabled with every control disabled.
        $CFG->passwordpolicy = true;
        $CFG->minpasswordlength = 0;
        $CFG->minpassworddigits = 0;
        $CFG->minpasswordlower = 0;
        $CFG->minpasswordupper = 0;
        $CFG->minpasswordnonalphanum = 0;
        $CFG->maxconsecutiveidentchars = 0;

// Check for empty response.
        $this->assertEquals($policydisabled, print_password_policy());

// Now enable some controls, and check that the policy responds with policy text.
        $CFG->minpasswordlength = 8;
        $CFG->minpassworddigits = 1;
        $CFG->minpasswordlower = 1;
        $CFG->minpasswordupper = 1;
        $CFG->minpasswordnonalphanum = 1;
        $CFG->maxconsecutiveidentchars = 1;

$this->assertNotEquals($policydisabled, print_password_policy());
    }

/**
     * Data provider for the testing get_html_lang_attribute_value().
     *
     * @return string[][]
     */
    public function get_html_lang_attribute_value_provider() {
        return [
            'Empty lang code' => ['    ', 'en'],
            'English' => ['en', 'en'],
            'English, US' => ['en_us', 'en'],
            'Unknown' => ['xx', 'en'],
        ];
    }

/**
     * Test for get_html_lang_attribute_value().
     *
     * @covers ::get_html_lang_attribute_value()
     * @dataProvider get_html_lang_attribute_value_provider
     * @param string $langcode The language code to convert.
     * @param string $expected The expected converted value.
     * @return void
     */
    public function test_get_html_lang_attribute_value(string $langcode, string $expected): void {
        $this->assertEquals($expected, get_html_lang_attribute_value($langcode));
    }

/**
     * Test the coding exceptions when returning URL as relative path from $CFG->wwwroot.
     *
     * @param moodle_url $url The URL pointing to a web resource.
     * @param string $exmessage The expected output URL.
     * @throws coding_exception If called on a non-local URL.
     * @see \moodle_url::out_as_local_url()
     * @covers \moodle_url::out_as_local_url
     * @dataProvider out_as_local_url_coding_exception_provider
     */
    public function test_out_as_local_url_coding_exception(\moodle_url $url, string $exmessage) {
        $this->expectException(\coding_exception::class);
        $this->expectExceptionMessage($exmessage);
        $localurl = $url->out_as_local_url();
    }

/**
 * Data provider for throwing coding exceptions in \moodle_url::out_as_local_url().
 *
 * @return array
 * @throws moodle_exception On seriously malformed URLs (parse_url).
 * @see \moodle_url::out_as_local_url()
 * @see parse_url()
 */
 public function out_as_local_url_coding_exception_provider() {
 return [
 'Google Maps CDN (HTTPS)' => [
 new \moodle_url('https://maps.googleapis.com/maps/api/js', ['key' => 'googlemapkey3', 'sensor' => 'false']),
 'Coding error detected, it must be fixed by a programmer: out_as_local_url called on a non-local URL'
 ],
 'Google Maps CDN (HTTP)' => [
 new \moodle_url('http://maps.googleapis.com/maps/api/js', ['key' => 'googlemapkey3', 'sensor' => 'false']),
 'Coding error detected, it must be fixed by a programmer: out_as_local_url called on a non-local URL'
 ],
 ];
 }

/**
     * Test URL as relative path from $CFG->wwwroot.
     *
     * @param moodle_url $url The URL pointing to a web resource.
     * @param string $expected The expected local URL.
     * @throws coding_exception If called on a non-local URL.
     * @see \moodle_url::out_as_local_url()
     * @covers \moodle_url::out_as_local_url
     * @dataProvider out_as_local_url_provider
     */
    public function test_out_as_local_url(\moodle_url $url, string $expected) {
        $this->assertEquals($expected, $url->out_as_local_url(false));
    }

/**
 * Data provider for returning local paths via \moodle_url::out_as_local_url().
 *
 * @return array
 * @throws moodle_exception On seriously malformed URLs (parse_url).
 * @see \moodle_url::out_as_local_url()
 * @see parse_url()
 */
 public function out_as_local_url_provider() {
 global $CFG;
 $wwwroot = rtrim($CFG->wwwroot, '/');

return [
            'Environment XML file' => [
                new \moodle_url('/admin/environment.xml'),
                '/admin/environment.xml'
            ],
            'H5P JS internal resource' => [
                new \moodle_url('/h5p/js/embed.js'),
                '/h5p/js/embed.js'
            ],
            'A Moodle JS resource using the full path including the proper JS Handler' => [
                new \moodle_url($wwwroot . '/lib/javascript.php/1/lib/editor/tiny/js/tinymce/tinymce.js'),
                '/lib/javascript.php/1/lib/editor/tiny/js/tinymce/tinymce.js'
            ],
        ];
    }

/**
     * Test URL as relative path from $CFG->wwwroot.
     *
     * @param moodle_url $url The URL pointing to a web resource.
     * @param bool $expected The expected result.
     * @see \moodle_url::is_local_url()
     * @covers \moodle_url::is_local_url
     * @dataProvider is_local_url_provider
     */
    public function test_is_local_url(\moodle_url $url, bool $expected) {
        $this->assertEquals($expected, $url->is_local_url(), "'{$url}' is not a local URL!");
    }

/**
 * Data provider for testing \moodle_url::is_local_url().
 *
 * @return array
 * @see \moodle_url::is_local_url()
 */
 public function is_local_url_provider() {
 global $CFG;
 $wwwroot = rtrim($CFG->wwwroot, '/');

return [
            'Google Maps CDN (HTTPS)' => [
                new \moodle_url('https://maps.googleapis.com/maps/api/js', ['key' => 'googlemapkey3', 'sensor' => 'false']),
                false
            ],
            'Google Maps CDN (HTTP)' => [
                new \moodle_url('http://maps.googleapis.com/maps/api/js', ['key' => 'googlemapkey3', 'sensor' => 'false']),
                false
            ],
            'wwwroot' => [
                new \moodle_url($wwwroot),
                true
            ],
            'wwwroot/' => [
                new \moodle_url($wwwroot . '/'),
                true
            ],
            'Environment XML file' => [
                new \moodle_url('/admin/environment.xml'),
                true
            ],
            'H5P JS internal resource' => [
                new \moodle_url('/h5p/js/embed.js'),
                true
            ],
        ];
    }

/**
     * Data provider for strip_querystring tests.
     *
     * @return array
     */
    public function strip_querystring_provider(): array {
        return [
            'Null' => [null, ''],
            'Empty string' => ['', ''],
            'No querystring' => ['https://example.com', 'https://example.com'],
            'Querystring' => ['https://example.com?foo=bar', 'https://example.com'],
            'Querystring with fragment' => ['https://example.com?foo=bar#baz', 'https://example.com'],
            'Querystring with fragment and path' => ['https://example.com/foo/bar?foo=bar#baz', 'https://example.com/foo/bar'],
        ];
    }

/**
     * Test the strip_querystring function with various exampels.
     *
     * @dataProvider strip_querystring_provider
     * @param mixed $value
     * @param mixed $expected
     * @covers ::strip_querystring
     */
    public function test_strip_querystring($value, $expected): void {
        $this->assertEquals($expected, strip_querystring($value));
    }
}

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