Proyectos de Subversion Moodle

<?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/>.

namespace core;

use lang_string;

/**

 * Unit tests for (some of) ../moodlelib.php.

 *

 * @package    core

 * @category   phpunit

 * @copyright  © 2006 The Open University

 * @author     T.J.Hunt@open.ac.uk

 * @author     nicolas@moodle.com

 */

final class moodlelib_test extends \advanced_testcase {

    /**

     * Define a local decimal separator.

     *

     * It is not possible to directly change the result of get_string in

     * a unit test. Instead, we create a language pack for language 'xx' in

     * dataroot and make langconfig.php with the string we need to change.

     * The default example separator used here is 'X'; on PHP 5.3 and before this

     * must be a single byte character due to PHP bug/limitation in

     * number_format, so you can't use UTF-8 characters.

     *

     * @param string $decsep Separator character. Defaults to `'X'`.

     */

    protected function define_local_decimal_separator(string $decsep = 'X') {

        global $SESSION, $CFG;

        $SESSION->lang = 'xx';

        $langconfig = "<?php\n\$string['decsep'] = '$decsep';";

        $langfolder = $CFG->dataroot . '/lang/xx';

        check_dir_exists($langfolder);

        file_put_contents($langfolder . '/langconfig.php', $langconfig);

        // Ensure the new value is picked up and not taken from the cache.

        $stringmanager = get_string_manager();

        $stringmanager->reset_caches(true);

    }

    public function test_cleanremoteaddr(): void {

        // IPv4.

        $this->assertNull(cleanremoteaddr('1023.121.234.1'));

        $this->assertSame('123.121.234.1', cleanremoteaddr('123.121.234.01 '));

        // IPv6.

        $this->assertNull(cleanremoteaddr('0:0:0:0:0:0:0:0:0'));

        $this->assertNull(cleanremoteaddr('0:0:0:0:0:0:0:abh'));

        $this->assertNull(cleanremoteaddr('0:0:0:::0:0:1'));

        $this->assertSame('::', cleanremoteaddr('0:0:0:0:0:0:0:0', true));

        $this->assertSame('::1:1', cleanremoteaddr('0:0:0:0:0:0:1:1', true));

        $this->assertSame('abcd:ef::', cleanremoteaddr('abcd:00ef:0:0:0:0:0:0', true));

        $this->assertSame('1::1', cleanremoteaddr('1:0:0:0:0:0:0:1', true));

        $this->assertSame('0:0:0:0:0:0:10:1', cleanremoteaddr('::10:1', false));

        $this->assertSame('1:1:0:0:0:0:0:0', cleanremoteaddr('01:1::', false));

        $this->assertSame('10:0:0:0:0:0:0:10', cleanremoteaddr('10::10', false));

        $this->assertSame('::ffff:c0a8:11', cleanremoteaddr('::ffff:192.168.1.1', true));

    }

    public function test_address_in_subnet(): void {

        // 1: xxx.xxx.xxx.xxx/nn or xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx/nnn (number of bits in net mask).

        $this->assertTrue(address_in_subnet('123.121.234.1', '123.121.234.1/32'));

        $this->assertFalse(address_in_subnet('123.121.23.1', '123.121.23.0/32'));

        $this->assertTrue(address_in_subnet('10.10.10.100',  '123.121.23.45/0'));

        $this->assertTrue(address_in_subnet('123.121.234.1', '123.121.234.0/24'));

        $this->assertFalse(address_in_subnet('123.121.34.1', '123.121.234.0/24'));

        $this->assertTrue(address_in_subnet('123.121.234.1', '123.121.234.0/30'));

        $this->assertFalse(address_in_subnet('123.121.23.8', '123.121.23.0/30'));

        $this->assertTrue(address_in_subnet('baba:baba::baba', 'baba:baba::baba/128'));

        $this->assertFalse(address_in_subnet('bab:baba::baba', 'bab:baba::cece/128'));

        $this->assertTrue(address_in_subnet('baba:baba::baba', 'cece:cece::cece/0'));

        $this->assertTrue(address_in_subnet('baba:baba::baba', 'baba:baba::baba/128'));

        $this->assertTrue(address_in_subnet('baba:baba::00ba', 'baba:baba::/120'));

        $this->assertFalse(address_in_subnet('baba:baba::aba', 'baba:baba::/120'));

        $this->assertTrue(address_in_subnet('baba::baba:00ba', 'baba::baba:0/112'));

        $this->assertFalse(address_in_subnet('baba::aba:00ba', 'baba::baba:0/112'));

        $this->assertFalse(address_in_subnet('aba::baba:0000', 'baba::baba:0/112'));

        // Fixed input.

        $this->assertTrue(address_in_subnet('123.121.23.1   ', ' 123.121.23.0 / 24'));

        $this->assertTrue(address_in_subnet('::ffff:10.1.1.1', ' 0:0:0:000:0:ffff:a1:10 / 126'));

        // Incorrect input.

        $this->assertFalse(address_in_subnet('123.121.234.1', '123.121.234.1/-2'));

        $this->assertFalse(address_in_subnet('123.121.234.1', '123.121.234.1/64'));

        $this->assertFalse(address_in_subnet('123.121.234.x', '123.121.234.1/24'));

        $this->assertFalse(address_in_subnet('123.121.234.0', '123.121.234.xx/24'));

        $this->assertFalse(address_in_subnet('123.121.234.1', '123.121.234.1/xx0'));

        $this->assertFalse(address_in_subnet('::1', '::aa:0/xx0'));

        $this->assertFalse(address_in_subnet('::1', '::aa:0/-5'));

        $this->assertFalse(address_in_subnet('::1', '::aa:0/130'));

        $this->assertFalse(address_in_subnet('x:1', '::aa:0/130'));

        $this->assertFalse(address_in_subnet('::1', '::ax:0/130'));

        // 2: xxx.xxx.xxx.xxx-yyy or  xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx::xxxx-yyyy (a range of IP addresses in the last group).

        $this->assertTrue(address_in_subnet('123.121.234.12', '123.121.234.12-14'));

        $this->assertTrue(address_in_subnet('123.121.234.13', '123.121.234.12-14'));

        $this->assertTrue(address_in_subnet('123.121.234.14', '123.121.234.12-14'));

        $this->assertFalse(address_in_subnet('123.121.234.1', '123.121.234.12-14'));

        $this->assertFalse(address_in_subnet('123.121.234.20', '123.121.234.12-14'));

        $this->assertFalse(address_in_subnet('123.121.23.12', '123.121.234.12-14'));

        $this->assertFalse(address_in_subnet('123.12.234.12', '123.121.234.12-14'));

        $this->assertTrue(address_in_subnet('baba:baba::baba', 'baba:baba::baba-babe'));

        $this->assertTrue(address_in_subnet('baba:baba::babc', 'baba:baba::baba-babe'));

        $this->assertTrue(address_in_subnet('baba:baba::babe', 'baba:baba::baba-babe'));

        $this->assertFalse(address_in_subnet('bab:baba::bab0', 'bab:baba::baba-babe'));

        $this->assertFalse(address_in_subnet('bab:baba::babf', 'bab:baba::baba-babe'));

        $this->assertFalse(address_in_subnet('bab:baba::bfbe', 'bab:baba::baba-babe'));

        $this->assertFalse(address_in_subnet('bfb:baba::babe', 'bab:baba::baba-babe'));

        // Fixed input.

        $this->assertTrue(address_in_subnet('123.121.234.12', '123.121.234.12 - 14 '));

        $this->assertTrue(address_in_subnet('bab:baba::babe', 'bab:baba::baba - babe  '));

        // Incorrect input.

        $this->assertFalse(address_in_subnet('123.121.234.12', '123.121.234.12-234.14'));

        $this->assertFalse(address_in_subnet('123.121.234.12', '123.121.234.12-256'));

        $this->assertFalse(address_in_subnet('123.121.234.12', '123.121.234.12--256'));

        // 3: xxx.xxx or xxx.xxx. or xxx:xxx:xxxx or xxx:xxx:xxxx. (incomplete address, a bit non-technical ;-).

        $this->assertTrue(address_in_subnet('123.121.234.12', '123.121.234.12'));

        $this->assertFalse(address_in_subnet('123.121.23.12', '123.121.23.13'));

        $this->assertTrue(address_in_subnet('123.121.234.12', '123.121.234.'));

        $this->assertTrue(address_in_subnet('123.121.234.12', '123.121.234'));

        $this->assertTrue(address_in_subnet('123.121.234.12', '123.121'));

        $this->assertTrue(address_in_subnet('123.121.234.12', '123'));

        $this->assertFalse(address_in_subnet('123.121.234.1', '12.121.234.'));

        $this->assertFalse(address_in_subnet('123.121.234.1', '12.121.234'));

        $this->assertTrue(address_in_subnet('baba:baba::bab', 'baba:baba::bab'));

        $this->assertFalse(address_in_subnet('baba:baba::ba', 'baba:baba::bc'));

        $this->assertTrue(address_in_subnet('baba:baba::bab', 'baba:baba'));

        $this->assertTrue(address_in_subnet('baba:baba::bab', 'baba:'));

        $this->assertFalse(address_in_subnet('bab:baba::bab', 'baba:'));

        // Multiple subnets.

        $this->assertTrue(address_in_subnet('123.121.234.12', '::1/64, 124., 123.121.234.10-30'));

        $this->assertTrue(address_in_subnet('124.121.234.12', '::1/64, 124., 123.121.234.10-30'));

        $this->assertTrue(address_in_subnet('::2',            '::1/64, 124., 123.121.234.10-30'));

        $this->assertFalse(address_in_subnet('12.121.234.12', '::1/64, 124., 123.121.234.10-30'));

        // Other incorrect input.

        $this->assertFalse(address_in_subnet('123.123.123.123', ''));

    }

    public function test_fix_utf8(): void {

        // Make sure valid data including other types is not changed.

        $this->assertSame(null, fix_utf8(null));

        $this->assertSame(1, fix_utf8(1));

        $this->assertSame(1.1, fix_utf8(1.1));

        $this->assertSame(true, fix_utf8(true));

        $this->assertSame('', fix_utf8(''));

        $this->assertSame('abc', fix_utf8('abc'));

        $array = array('do', 're', 'mi');

        $this->assertSame($array, fix_utf8($array));

        $object = new \stdClass();

        $object->a = 'aa';

        $object->b = 'bb';

        $this->assertEquals($object, fix_utf8($object));

        // valid utf8 string

        $this->assertSame("žlutý koníček přeskočil potůček \n\t\r", fix_utf8("žlutý koníček přeskočil potůček \n\t\r\0"));

        // Invalid utf8 string.

        $this->assertSame('aš', fix_utf8('a'.chr(130).'š'), 'This fails with buggy iconv() when mbstring extenstion is not available as fallback.');

        $this->assertSame('Hello ', fix_utf8('Hello ï¿¿'));

    }

    public function test_optional_param(): void {

        global $CFG;

        $_POST['username'] = 'post_user';

        $_GET['username'] = 'get_user';

        $this->assertSame($_POST['username'], optional_param('username', 'default_user', PARAM_RAW));

        unset($_POST['username']);

        $this->assertSame($_GET['username'], optional_param('username', 'default_user', PARAM_RAW));

        unset($_GET['username']);

        $this->assertSame('default_user', optional_param('username', 'default_user', PARAM_RAW));

        // Make sure warning is displayed if array submitted - TODO: throw exception in Moodle 2.3.

        $_POST['username'] = array('a'=>'a');

        try {

            optional_param('username', 'default_user', PARAM_RAW);

            $this->fail('coding_exception expected');

        } catch (\coding_exception $e) {

        }

    }

    public function test_optional_param_array(): void {

        global $CFG;

        $_POST['username'] = array('a'=>'post_user');

        $_GET['username'] = array('a'=>'get_user');

        $this->assertSame($_POST['username'], optional_param_array('username', array('a'=>'default_user'), PARAM_RAW));

        unset($_POST['username']);

        $this->assertSame($_GET['username'], optional_param_array('username', array('a'=>'default_user'), PARAM_RAW));

        unset($_GET['username']);

        $this->assertSame(array('a'=>'default_user'), optional_param_array('username', array('a'=>'default_user'), PARAM_RAW));

        // Do not allow nested arrays.

        try {

            $_POST['username'] = array('a'=>array('b'=>'post_user'));

            optional_param_array('username', array('a'=>'default_user'), PARAM_RAW);

            $this->fail('coding_exception expected');

        } catch (\coding_exception $ex) {

            $this->assertTrue(true);

        }

        // Do not allow non-arrays.

        $_POST['username'] = 'post_user';

        $this->assertSame(array('a'=>'default_user'), optional_param_array('username', array('a'=>'default_user'), PARAM_RAW));

        $this->assertDebuggingCalled();

        // Make sure array keys are sanitised.

        $_POST['username'] = array('abc123_;-/*-+ '=>'arrggh', 'a1_-'=>'post_user');

        $this->assertSame(array('a1_-'=>'post_user'), optional_param_array('username', array(), PARAM_RAW));

        $this->assertDebuggingCalled();

    }

    public function test_required_param(): void {

        $_POST['username'] = 'post_user';

        $_GET['username'] = 'get_user';

        $this->assertSame('post_user', required_param('username', PARAM_RAW));

        unset($_POST['username']);

        $this->assertSame('get_user', required_param('username', PARAM_RAW));

        unset($_GET['username']);

        try {

            $this->assertSame('default_user', required_param('username', PARAM_RAW));

            $this->fail('moodle_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('moodle_exception', $ex);

        }

        try {

            required_param('', PARAM_RAW);

            $this->fail('coding_exception expected');

        } catch (\moodle_exception $ex) {

        }

        // Make sure warning is displayed if array submitted - TODO: throw exception in Moodle 2.3.

        $_POST['username'] = array('a'=>'a');

        try {

            required_param('username', PARAM_RAW);

            $this->fail('coding_exception expected');

        } catch (\coding_exception $e) {

        }

    }

    public function test_required_param_array(): void {

        global $CFG;

        $_POST['username'] = array('a'=>'post_user');

        $_GET['username'] = array('a'=>'get_user');

        $this->assertSame($_POST['username'], required_param_array('username', PARAM_RAW));

        unset($_POST['username']);

        $this->assertSame($_GET['username'], required_param_array('username', PARAM_RAW));

        // Do not allow nested arrays.

        try {

            $_POST['username'] = array('a'=>array('b'=>'post_user'));

            required_param_array('username', PARAM_RAW);

            $this->fail('coding_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('coding_exception', $ex);

        }

        // Do not allow non-arrays.

        try {

            $_POST['username'] = 'post_user';

            required_param_array('username', PARAM_RAW);

            $this->fail('moodle_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('moodle_exception', $ex);

        }

        // Make sure array keys are sanitised.

        $_POST['username'] = array('abc123_;-/*-+ '=>'arrggh', 'a1_-'=>'post_user');

        $this->assertSame(array('a1_-'=>'post_user'), required_param_array('username', PARAM_RAW));

        $this->assertDebuggingCalled();

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param(): void {

        // Forbid objects and arrays.

        try {

            clean_param(array('x', 'y'), PARAM_RAW);

            $this->fail('coding_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('coding_exception', $ex);

        }

        try {

            $param = new \stdClass();

            $param->id = 1;

            clean_param($param, PARAM_RAW);

            $this->fail('coding_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('coding_exception', $ex);

        }

        // Require correct type.

        try {

            clean_param('x', 'xxxxxx');

            $this->fail('moodle_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('moodle_exception', $ex);

        }

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_array(): void {

        $this->assertSame(array(), clean_param_array(null, PARAM_RAW));

        $this->assertSame(array('a', 'b'), clean_param_array(array('a', 'b'), PARAM_RAW));

        $this->assertSame(array('a', array('b')), clean_param_array(array('a', array('b')), PARAM_RAW, true));

        // Require correct type.

        try {

            clean_param_array(array('x'), 'xxxxxx');

            $this->fail('moodle_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('moodle_exception', $ex);

        }

        try {

            clean_param_array(array('x', array('y')), PARAM_RAW);

            $this->fail('coding_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('coding_exception', $ex);

        }

        // Test recursive.

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_raw(): void {

        $this->assertSame(

            '#()*#,9789\'".,<42897></?$(*DSFMO#$*)(SDJ)($*)',

            clean_param('#()*#,9789\'".,<42897></?$(*DSFMO#$*)(SDJ)($*)', PARAM_RAW));

        $this->assertSame(null, clean_param(null, PARAM_RAW));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_trim(): void {

        $this->assertSame('Frog toad', clean_param("   Frog toad   \r\n  ", PARAM_RAW_TRIMMED));

        $this->assertSame('', clean_param(null, PARAM_RAW_TRIMMED));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_clean(): void {

        // PARAM_CLEAN is an ugly hack, do not use in new code (skodak),

        // instead use more specific type, or submit sothing that can be verified properly.

        $this->assertSame('xx', clean_param('xx<script>', PARAM_CLEAN));

        $this->assertSame('', clean_param(null, PARAM_CLEAN));

        $this->assertSame('', clean_param(null, PARAM_CLEANHTML));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_alpha(): void {

        $this->assertSame('DSFMOSDJ', clean_param('#()*#,9789\'".,<42897></?$(*DSFMO#$*)(SDJ)($*)', PARAM_ALPHA));

        $this->assertSame('', clean_param(null, PARAM_ALPHA));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_alphanum(): void {

        $this->assertSame('978942897DSFMOSDJ', clean_param('#()*#,9789\'".,<42897></?$(*DSFMO#$*)(SDJ)($*)', PARAM_ALPHANUM));

        $this->assertSame('', clean_param(null, PARAM_ALPHANUM));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_alphaext(): void {

        $this->assertSame('DSFMOSDJ', clean_param('#()*#,9789\'".,<42897></?$(*DSFMO#$*)(SDJ)($*)', PARAM_ALPHAEXT));

        $this->assertSame('', clean_param(null, PARAM_ALPHAEXT));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_sequence(): void {

        $this->assertSame(',9789,42897', clean_param('#()*#,9789\'".,<42897></?$(*DSFMO#$*)(SDJ)($*)', PARAM_SEQUENCE));

        $this->assertSame('', clean_param(null, PARAM_SEQUENCE));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_component(): void {

        // Please note the cleaning of component names is very strict, no guessing here.

        $this->assertSame('mod_forum', clean_param('mod_forum', PARAM_COMPONENT));

        $this->assertSame('block_online_users', clean_param('block_online_users', PARAM_COMPONENT));

        $this->assertSame('block_blond_online_users', clean_param('block_blond_online_users', PARAM_COMPONENT));

        $this->assertSame('mod_something2', clean_param('mod_something2', PARAM_COMPONENT));

        $this->assertSame('forum', clean_param('forum', PARAM_COMPONENT));

        $this->assertSame('user', clean_param('user', PARAM_COMPONENT));

        $this->assertSame('rating', clean_param('rating', PARAM_COMPONENT));

        $this->assertSame('feedback360', clean_param('feedback360', PARAM_COMPONENT));

        $this->assertSame('mod_feedback360', clean_param('mod_feedback360', PARAM_COMPONENT));

        $this->assertSame('', clean_param('mod_2something', PARAM_COMPONENT));

        $this->assertSame('', clean_param('2mod_something', PARAM_COMPONENT));

        $this->assertSame('', clean_param('mod_something_xx', PARAM_COMPONENT));

        $this->assertSame('', clean_param('auth_something__xx', PARAM_COMPONENT));

        $this->assertSame('', clean_param('mod_Something', PARAM_COMPONENT));

        $this->assertSame('', clean_param('mod_somethíng', PARAM_COMPONENT));

        $this->assertSame('', clean_param('mod__something', PARAM_COMPONENT));

        $this->assertSame('', clean_param('auth_xx-yy', PARAM_COMPONENT));

        $this->assertSame('', clean_param('_auth_xx', PARAM_COMPONENT));

        $this->assertSame('a2uth_xx', clean_param('a2uth_xx', PARAM_COMPONENT));

        $this->assertSame('', clean_param('auth_xx_', PARAM_COMPONENT));

        $this->assertSame('', clean_param('auth_xx.old', PARAM_COMPONENT));

        $this->assertSame('', clean_param('_user', PARAM_COMPONENT));

        $this->assertSame('', clean_param('2rating', PARAM_COMPONENT));

        $this->assertSame('', clean_param('user_', PARAM_COMPONENT));

        $this->assertSame('', clean_param(null, PARAM_COMPONENT));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_localisedfloat(): void {

        $this->assertSame(0.5, clean_param('0.5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('0X5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(0.5, clean_param('.5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('X5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(10.5, clean_param('10.5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('10X5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(1000.5, clean_param('1 000.5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('1 000X5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('1.000.5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('1X000X5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('nan', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('10.6blah', PARAM_LOCALISEDFLOAT));

        $this->assertSame(null, clean_param(null, PARAM_LOCALISEDFLOAT));

        // Tests with a localised decimal separator.

        $this->define_local_decimal_separator();

        $this->assertSame(0.5, clean_param('0.5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(0.5, clean_param('0X5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(0.5, clean_param('.5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(0.5, clean_param('X5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(10.5, clean_param('10.5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(10.5, clean_param('10X5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(1000.5, clean_param('1 000.5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(1000.5, clean_param('1 000X5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('1.000.5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('1X000X5', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('nan', PARAM_LOCALISEDFLOAT));

        $this->assertSame(false, clean_param('10X6blah', PARAM_LOCALISEDFLOAT));

    }

    public function test_is_valid_plugin_name(): void {

        $this->assertTrue(is_valid_plugin_name('forum'));

        $this->assertTrue(is_valid_plugin_name('forum2'));

        $this->assertTrue(is_valid_plugin_name('feedback360'));

        $this->assertTrue(is_valid_plugin_name('online_users'));

        $this->assertTrue(is_valid_plugin_name('blond_online_users'));

        $this->assertFalse(is_valid_plugin_name('online__users'));

        $this->assertFalse(is_valid_plugin_name('forum '));

        $this->assertFalse(is_valid_plugin_name('forum.old'));

        $this->assertFalse(is_valid_plugin_name('xx-yy'));

        $this->assertFalse(is_valid_plugin_name('2xx'));

        $this->assertFalse(is_valid_plugin_name('Xx'));

        $this->assertFalse(is_valid_plugin_name('_xx'));

        $this->assertFalse(is_valid_plugin_name('xx_'));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_plugin(): void {

        // Please note the cleaning of plugin names is very strict, no guessing here.

        $this->assertSame('forum', clean_param('forum', PARAM_PLUGIN));

        $this->assertSame('forum2', clean_param('forum2', PARAM_PLUGIN));

        $this->assertSame('feedback360', clean_param('feedback360', PARAM_PLUGIN));

        $this->assertSame('online_users', clean_param('online_users', PARAM_PLUGIN));

        $this->assertSame('blond_online_users', clean_param('blond_online_users', PARAM_PLUGIN));

        $this->assertSame('', clean_param('online__users', PARAM_PLUGIN));

        $this->assertSame('', clean_param('forum ', PARAM_PLUGIN));

        $this->assertSame('', clean_param('forum.old', PARAM_PLUGIN));

        $this->assertSame('', clean_param('xx-yy', PARAM_PLUGIN));

        $this->assertSame('', clean_param('2xx', PARAM_PLUGIN));

        $this->assertSame('', clean_param('Xx', PARAM_PLUGIN));

        $this->assertSame('', clean_param('_xx', PARAM_PLUGIN));

        $this->assertSame('', clean_param('xx_', PARAM_PLUGIN));

        $this->assertSame('', clean_param(null, PARAM_PLUGIN));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_area(): void {

        // Please note the cleaning of area names is very strict, no guessing here.

        $this->assertSame('something', clean_param('something', PARAM_AREA));

        $this->assertSame('something2', clean_param('something2', PARAM_AREA));

        $this->assertSame('some_thing', clean_param('some_thing', PARAM_AREA));

        $this->assertSame('some_thing_xx', clean_param('some_thing_xx', PARAM_AREA));

        $this->assertSame('feedback360', clean_param('feedback360', PARAM_AREA));

        $this->assertSame('', clean_param('_something', PARAM_AREA));

        $this->assertSame('', clean_param('something_', PARAM_AREA));

        $this->assertSame('', clean_param('2something', PARAM_AREA));

        $this->assertSame('', clean_param('Something', PARAM_AREA));

        $this->assertSame('', clean_param('some-thing', PARAM_AREA));

        $this->assertSame('', clean_param('somethííng', PARAM_AREA));

        $this->assertSame('', clean_param('something.x', PARAM_AREA));

        $this->assertSame('', clean_param(null, PARAM_AREA));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_text(): void {

        // Standard.

        $this->assertSame('xx<lang lang="en">aa</lang><lang lang="yy">pp</lang>', clean_param('xx<lang lang="en">aa</lang><lang lang="yy">pp</lang>', PARAM_TEXT));

        $this->assertSame('<span lang="en" class="multilang">aa</span><span lang="xy" class="multilang">bb</span>', clean_param('<span lang="en" class="multilang">aa</span><span lang="xy" class="multilang">bb</span>', PARAM_TEXT));

        $this->assertSame('xx<lang lang="en">aa'."\n".'</lang><lang lang="yy">pp</lang>', clean_param('xx<lang lang="en">aa'."\n".'</lang><lang lang="yy">pp</lang>', PARAM_TEXT));

        // Malformed.

        $this->assertSame('<span lang="en" class="multilang">aa</span>', clean_param('<span lang="en" class="multilang">aa</span>', PARAM_TEXT));

        $this->assertSame('aa', clean_param('<span lang="en" class="nothing" class="multilang">aa</span>', PARAM_TEXT));

        $this->assertSame('aa', clean_param('<lang lang="en" class="multilang">aa</lang>', PARAM_TEXT));

        $this->assertSame('aa', clean_param('<lang lang="en!!">aa</lang>', PARAM_TEXT));

        $this->assertSame('aa', clean_param('<span lang="en==" class="multilang">aa</span>', PARAM_TEXT));

        $this->assertSame('abc', clean_param('a<em>b</em>c', PARAM_TEXT));

        $this->assertSame('a>c>', clean_param('a><xx >c>', PARAM_TEXT)); // Standard strip_tags() behaviour.

        $this->assertSame('a', clean_param('a<b', PARAM_TEXT));

        $this->assertSame('a>b', clean_param('a>b', PARAM_TEXT));

        $this->assertSame('<lang lang="en">a>a</lang>', clean_param('<lang lang="en">a>a</lang>', PARAM_TEXT)); // Standard strip_tags() behaviour.

        $this->assertSame('a', clean_param('<lang lang="en">a<a</lang>', PARAM_TEXT));

        $this->assertSame('<lang lang="en">aa</lang>', clean_param('<lang lang="en">a<br>a</lang>', PARAM_TEXT));

        $this->assertSame('', clean_param(null, PARAM_TEXT));

    }

    /**

     * Data provider for {@see test_clean_param_host}

     *

     * @return array

     */

    public static function clean_param_host_provider(): array {

        return [

            'Valid (low octets)' => ['0.0.0.0', '0.0.0.0'],

            'Valid (high octets)' => ['255.255.255.255', '255.255.255.255'],

            'Invalid first octet' => ['256.1.1.1', ''],

            'Invalid second octet' => ['1.256.1.1', ''],

            'Invalid third octet' => ['1.1.256.1', ''],

            'Invalid fourth octet' => ['1.1.1.256', ''],

            'Valid host' => ['moodle.org', 'moodle.org'],

            'Invalid host' => ['.example.com', ''],

        ];

    }

    /**

     * Testing cleaning parameters with PARAM_HOST

     *

     * @param string $param

     * @param string $expected

     *

     * @dataProvider clean_param_host_provider

     *

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_host(string $param, string $expected): void {

        $this->assertEquals($expected, clean_param($param, PARAM_HOST));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_url(): void {

        // Test PARAM_URL and PARAM_LOCALURL a bit.

        // Valid URLs.

        $this->assertSame('http://google.com/', clean_param('http://google.com/', PARAM_URL));

        $this->assertSame('http://some.very.long.and.silly.domain/with/a/path/', clean_param('http://some.very.long.and.silly.domain/with/a/path/', PARAM_URL));

        $this->assertSame('http://localhost/', clean_param('http://localhost/', PARAM_URL));

        $this->assertSame('http://0.255.1.1/numericip.php', clean_param('http://0.255.1.1/numericip.php', PARAM_URL));

        $this->assertSame('https://google.com/', clean_param('https://google.com/', PARAM_URL));

        $this->assertSame('https://some.very.long.and.silly.domain/with/a/path/', clean_param('https://some.very.long.and.silly.domain/with/a/path/', PARAM_URL));

        $this->assertSame('https://localhost/', clean_param('https://localhost/', PARAM_URL));

        $this->assertSame('https://0.255.1.1/numericip.php', clean_param('https://0.255.1.1/numericip.php', PARAM_URL));

        $this->assertSame('ftp://ftp.debian.org/debian/', clean_param('ftp://ftp.debian.org/debian/', PARAM_URL));

        $this->assertSame('/just/a/path', clean_param('/just/a/path', PARAM_URL));

        // Invalid URLs.

        $this->assertSame('', clean_param('funny:thing', PARAM_URL));

        $this->assertSame('', clean_param('http://example.ee/sdsf"f', PARAM_URL));

        $this->assertSame('', clean_param('javascript://comment%0Aalert(1)', PARAM_URL));

        $this->assertSame('', clean_param('rtmp://example.com/livestream', PARAM_URL));

        $this->assertSame('', clean_param('rtmp://example.com/live&foo', PARAM_URL));

        $this->assertSame('', clean_param('rtmp://example.com/fms&mp4:path/to/file.mp4', PARAM_URL));

        $this->assertSame('', clean_param('mailto:support@moodle.org', PARAM_URL));

        $this->assertSame('', clean_param('mailto:support@moodle.org?subject=Hello%20Moodle', PARAM_URL));

        $this->assertSame('', clean_param('mailto:support@moodle.org?subject=Hello%20Moodle&cc=feedback@moodle.org', PARAM_URL));

        $this->assertSame('', clean_param(null, PARAM_URL));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_localurl(): void {

        global $CFG;

        $this->resetAfterTest();

        // External, invalid.

        $this->assertSame('', clean_param('funny:thing', PARAM_LOCALURL));

        $this->assertSame('', clean_param('http://google.com/', PARAM_LOCALURL));

        $this->assertSame('', clean_param('https://google.com/?test=true', PARAM_LOCALURL));

        $this->assertSame('', clean_param('http://some.very.long.and.silly.domain/with/a/path/', PARAM_LOCALURL));

        // Local absolute.

        $this->assertSame(clean_param($CFG->wwwroot, PARAM_LOCALURL), $CFG->wwwroot);

        $this->assertSame($CFG->wwwroot . '/with/something?else=true',

            clean_param($CFG->wwwroot . '/with/something?else=true', PARAM_LOCALURL));

        // Local relative.

        $this->assertSame('/just/a/path', clean_param('/just/a/path', PARAM_LOCALURL));

        $this->assertSame('course/view.php?id=3', clean_param('course/view.php?id=3', PARAM_LOCALURL));

        // Local absolute HTTPS in a non HTTPS site.

        $CFG->wwwroot = str_replace('https:', 'http:', $CFG->wwwroot); // Need to simulate non-https site.

        $httpsroot = str_replace('http:', 'https:', $CFG->wwwroot);

        $this->assertSame('', clean_param($httpsroot, PARAM_LOCALURL));

        $this->assertSame('', clean_param($httpsroot . '/with/something?else=true', PARAM_LOCALURL));

        // Local absolute HTTPS in a HTTPS site.

        $CFG->wwwroot = str_replace('http:', 'https:', $CFG->wwwroot);

        $httpsroot = $CFG->wwwroot;

        $this->assertSame($httpsroot, clean_param($httpsroot, PARAM_LOCALURL));

        $this->assertSame($httpsroot . '/with/something?else=true',

            clean_param($httpsroot . '/with/something?else=true', PARAM_LOCALURL));

        // Test open redirects are not possible.

        $CFG->wwwroot = 'http://www.example.com';

        $this->assertSame('', clean_param('http://www.example.com.evil.net/hack.php', PARAM_LOCALURL));

        $CFG->wwwroot = 'https://www.example.com';

        $this->assertSame('', clean_param('https://www.example.com.evil.net/hack.php', PARAM_LOCALURL));

        $this->assertSame('', clean_param('', PARAM_LOCALURL));

        $this->assertSame('', clean_param(null, PARAM_LOCALURL));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_file(): void {

        $this->assertSame('correctfile.txt', clean_param('correctfile.txt', PARAM_FILE));

        $this->assertSame('badfile.txt', clean_param('b\'a<d`\\/fi:l>e.t"x|t', PARAM_FILE));

        $this->assertSame('..parentdirfile.txt', clean_param('../parentdirfile.txt', PARAM_FILE));

        $this->assertSame('....grandparentdirfile.txt', clean_param('../../grandparentdirfile.txt', PARAM_FILE));

        $this->assertSame('..winparentdirfile.txt', clean_param('..\winparentdirfile.txt', PARAM_FILE));

        $this->assertSame('....wingrandparentdir.txt', clean_param('..\..\wingrandparentdir.txt', PARAM_FILE));

        $this->assertSame('myfile.a.b.txt', clean_param('myfile.a.b.txt', PARAM_FILE));

        $this->assertSame('myfile..a..b.txt', clean_param('myfile..a..b.txt', PARAM_FILE));

        $this->assertSame('myfile.a..b...txt', clean_param('myfile.a..b...txt', PARAM_FILE));

        $this->assertSame('myfile.a.txt', clean_param('myfile.a.txt', PARAM_FILE));

        $this->assertSame('myfile...txt', clean_param('myfile...txt', PARAM_FILE));

        $this->assertSame('...jpg', clean_param('...jpg', PARAM_FILE));

        $this->assertSame('.a.b.', clean_param('.a.b.', PARAM_FILE));

        $this->assertSame('', clean_param('.', PARAM_FILE));

        $this->assertSame('', clean_param('..', PARAM_FILE));

        $this->assertSame('...', clean_param('...', PARAM_FILE));

        $this->assertSame('. . . .', clean_param('. . . .', PARAM_FILE));

        $this->assertSame('dontrtrim.me. .. .. . ', clean_param('dontrtrim.me. .. .. . ', PARAM_FILE));

        $this->assertSame(' . .dontltrim.me', clean_param(' . .dontltrim.me', PARAM_FILE));

        $this->assertSame('here is a tab.txt', clean_param("here is a tab\t.txt", PARAM_FILE));

        $this->assertSame('here is a linebreak.txt', clean_param("here is a line\r\nbreak.txt", PARAM_FILE));

        $this->assertSame('', clean_param(null, PARAM_FILE));

        // The following behaviours have been maintained although they seem a little odd.

        $this->assertSame('funnything', clean_param('funny:thing', PARAM_FILE));

        $this->assertSame('.currentdirfile.txt', clean_param('./currentdirfile.txt', PARAM_FILE));

        $this->assertSame('ctempwindowsfile.txt', clean_param('c:\temp\windowsfile.txt', PARAM_FILE));

        $this->assertSame('homeuserlinuxfile.txt', clean_param('/home/user/linuxfile.txt', PARAM_FILE));

        $this->assertSame('~myfile.txt', clean_param('~/myfile.txt', PARAM_FILE));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_path(): void {

        $this->assertSame('correctfile.txt', clean_param('correctfile.txt', PARAM_PATH));

        $this->assertSame('bad/file.txt', clean_param('b\'a<d`\\/fi:l>e.t"x|t', PARAM_PATH));

        $this->assertSame('/parentdirfile.txt', clean_param('../parentdirfile.txt', PARAM_PATH));

        $this->assertSame('/grandparentdirfile.txt', clean_param('../../grandparentdirfile.txt', PARAM_PATH));

        $this->assertSame('/winparentdirfile.txt', clean_param('..\winparentdirfile.txt', PARAM_PATH));

        $this->assertSame('/wingrandparentdir.txt', clean_param('..\..\wingrandparentdir.txt', PARAM_PATH));

        $this->assertSame('funnything', clean_param('funny:thing', PARAM_PATH));

        $this->assertSame('./here', clean_param('./././here', PARAM_PATH));

        $this->assertSame('./currentdirfile.txt', clean_param('./currentdirfile.txt', PARAM_PATH));

        $this->assertSame('c/temp/windowsfile.txt', clean_param('c:\temp\windowsfile.txt', PARAM_PATH));

        $this->assertSame('/home/user/linuxfile.txt', clean_param('/home/user/linuxfile.txt', PARAM_PATH));

        $this->assertSame('/home../user ./.linuxfile.txt', clean_param('/home../user ./.linuxfile.txt', PARAM_PATH));

        $this->assertSame('~/myfile.txt', clean_param('~/myfile.txt', PARAM_PATH));

        $this->assertSame('~/myfile.txt', clean_param('~/../myfile.txt', PARAM_PATH));

        $this->assertSame('/..b../.../myfile.txt', clean_param('/..b../.../myfile.txt', PARAM_PATH));

        $this->assertSame('..b../.../myfile.txt', clean_param('..b../.../myfile.txt', PARAM_PATH));

        $this->assertSame('/super/slashes/', clean_param('/super//slashes///', PARAM_PATH));

        $this->assertSame('', clean_param(null, PARAM_PATH));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_safepath(): void {

        $this->assertSame('folder/file', clean_param('folder/file', PARAM_SAFEPATH));

        $this->assertSame('folder//file', clean_param('folder/../file', PARAM_SAFEPATH));

        $this->assertSame('', clean_param(null, PARAM_SAFEPATH));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_username(): void {

        global $CFG;

        $currentstatus =  $CFG->extendedusernamechars;

        // Run tests with extended character == false;.

        $CFG->extendedusernamechars = false;

        $this->assertSame('johndoe123', clean_param('johndoe123', PARAM_USERNAME) );

        $this->assertSame('john.doe', clean_param('john.doe', PARAM_USERNAME));

        $this->assertSame('john-doe', clean_param('john-doe', PARAM_USERNAME));

        $this->assertSame('john-doe', clean_param('john- doe', PARAM_USERNAME));

        $this->assertSame('john_doe', clean_param('john_doe', PARAM_USERNAME));

        $this->assertSame('john@doe', clean_param('john@doe', PARAM_USERNAME));

        $this->assertSame('johndoe', clean_param('john~doe', PARAM_USERNAME));

        $this->assertSame('johndoe', clean_param('john´doe', PARAM_USERNAME));

        $this->assertSame(clean_param('john# $%&()+_^', PARAM_USERNAME), 'john_');

        $this->assertSame(clean_param(' john# $%&()+_^ ', PARAM_USERNAME), 'john_');

        $this->assertSame(clean_param('john#$%&() ', PARAM_USERNAME), 'john');

        $this->assertSame('johnd', clean_param('JOHNdóé ', PARAM_USERNAME));

        $this->assertSame(clean_param('john.,:;-_/|\ñÑ[]A_X-,D {} ~!@#$%^&*()_+ ?><[] ščřžžý ?ýáž?žý??šdoe ', PARAM_USERNAME), 'john.-_a_x-d@_doe');

        $this->assertSame('', clean_param(null, PARAM_USERNAME));

        // Test success condition, if extendedusernamechars == ENABLE;.

        $CFG->extendedusernamechars = true;

        $this->assertSame('john_doe', clean_param('john_doe', PARAM_USERNAME));

        $this->assertSame('john@doe', clean_param('john@doe', PARAM_USERNAME));

        $this->assertSame(clean_param('john# $%&()+_^', PARAM_USERNAME), 'john# $%&()+_^');

        $this->assertSame(clean_param(' john# $%&()+_^ ', PARAM_USERNAME), 'john# $%&()+_^');

        $this->assertSame('john~doe', clean_param('john~doe', PARAM_USERNAME));

        $this->assertSame('john´doe', clean_param('joHN´doe', PARAM_USERNAME));

        $this->assertSame('johndoe', clean_param('johnDOE', PARAM_USERNAME));

        $this->assertSame('johndóé', clean_param('johndóé ', PARAM_USERNAME));

        $CFG->extendedusernamechars = $currentstatus;

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_stringid(): void {

        // Test string identifiers validation.

        // Valid strings.

        $this->assertSame('validstring', clean_param('validstring', PARAM_STRINGID));

        $this->assertSame('mod/foobar:valid_capability', clean_param('mod/foobar:valid_capability', PARAM_STRINGID));

        $this->assertSame('CZ', clean_param('CZ', PARAM_STRINGID));

        $this->assertSame('application/vnd.ms-powerpoint', clean_param('application/vnd.ms-powerpoint', PARAM_STRINGID));

        $this->assertSame('grade2', clean_param('grade2', PARAM_STRINGID));

        // Invalid strings.

        $this->assertSame('', clean_param('trailing ', PARAM_STRINGID));

        $this->assertSame('', clean_param('space bar', PARAM_STRINGID));

        $this->assertSame('', clean_param('0numeric', PARAM_STRINGID));

        $this->assertSame('', clean_param('*', PARAM_STRINGID));

        $this->assertSame('', clean_param(' ', PARAM_STRINGID));

        $this->assertSame('', clean_param(null, PARAM_STRINGID));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_timezone(): void {

        // Test timezone validation.

        $testvalues = array (

            'America/Jamaica'                => 'America/Jamaica',

            'America/Argentina/Cordoba'      => 'America/Argentina/Cordoba',

            'America/Port-au-Prince'         => 'America/Port-au-Prince',

            'America/Argentina/Buenos_Aires' => 'America/Argentina/Buenos_Aires',

            'PST8PDT'                        => 'PST8PDT',

            'Wrong.Value'                    => '',

            'Wrong/.Value'                   => '',

            'Wrong(Value)'                   => '',

            '0'                              => '0',

            '0.0'                            => '0.0',

            '0.5'                            => '0.5',

            '9.0'                            => '9.0',

            '-9.0'                           => '-9.0',

            '+9.0'                           => '+9.0',

            '9.5'                            => '9.5',

            '-9.5'                           => '-9.5',

            '+9.5'                           => '+9.5',

            '12.0'                           => '12.0',

            '-12.0'                          => '-12.0',

            '+12.0'                          => '+12.0',

            '12.5'                           => '12.5',

            '-12.5'                          => '-12.5',

            '+12.5'                          => '+12.5',

            '13.0'                           => '13.0',

            '-13.0'                          => '-13.0',

            '+13.0'                          => '+13.0',

            '13.5'                           => '',

            '+13.5'                          => '',

            '-13.5'                          => '',

            '0.2'                            => '',

            ''                               => '',

        );

        foreach ($testvalues as $testvalue => $expectedvalue) {

            $actualvalue = clean_param($testvalue, PARAM_TIMEZONE);

            $this->assertEquals($expectedvalue, $actualvalue);

        }

        // Test for null.

        $this->assertEquals('', clean_param(null, PARAM_TIMEZONE));

    }

    /**

     * @covers \core\param

     * @covers \clean_param

     */

    public function test_clean_param_null_argument(): void {

        $this->assertEquals(0, clean_param(null, PARAM_INT));

        $this->assertEquals(0, clean_param(null, PARAM_FLOAT));

        $this->assertEquals(0, clean_param(null, PARAM_LOCALISEDFLOAT));

        $this->assertEquals(false, clean_param(null, PARAM_BOOL));

        $this->assertEquals('', clean_param(null, PARAM_NOTAGS));

        $this->assertEquals('', clean_param(null, PARAM_SAFEDIR));

        $this->assertEquals('', clean_param(null, PARAM_HOST));

        $this->assertEquals('', clean_param(null, PARAM_PEM));

        $this->assertEquals('', clean_param(null, PARAM_BASE64));

        $this->assertEquals('', clean_param(null, PARAM_TAG));

        $this->assertEquals('', clean_param(null, PARAM_TAGLIST));

        $this->assertEquals('', clean_param(null, PARAM_CAPABILITY));

        $this->assertEquals(0, clean_param(null, PARAM_PERMISSION));

        $this->assertEquals('', clean_param(null, PARAM_AUTH));

        $this->assertEquals('', clean_param(null, PARAM_LANG));

        $this->assertEquals('', clean_param(null, PARAM_THEME));

        $this->assertEquals('', clean_param(null, PARAM_EMAIL));

    }

    public function test_validate_param(): void {

        try {

            $param = validate_param('11a', PARAM_INT);

            $this->fail('invalid_parameter_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('invalid_parameter_exception', $ex);

        }

        $param = validate_param('11', PARAM_INT);

        $this->assertSame(11, $param);

        try {

            $param = validate_param(null, PARAM_INT, false);

            $this->fail('invalid_parameter_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('invalid_parameter_exception', $ex);

        }

        $param = validate_param(null, PARAM_INT, true);

        $this->assertSame(null, $param);

        try {

            $param = validate_param(array(), PARAM_INT);

            $this->fail('invalid_parameter_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('invalid_parameter_exception', $ex);

        }

        try {

            $param = validate_param(new \stdClass, PARAM_INT);

            $this->fail('invalid_parameter_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('invalid_parameter_exception', $ex);

        }

        $param = validate_param('1.0', PARAM_FLOAT);

        $this->assertSame(1.0, $param);

        // Make sure valid floats do not cause exception.

        validate_param(1.0, PARAM_FLOAT);

        validate_param(10, PARAM_FLOAT);

        validate_param('0', PARAM_FLOAT);

        validate_param('119813454.545464564564546564545646556564465465456465465465645645465645645645', PARAM_FLOAT);

        validate_param('011.1', PARAM_FLOAT);

        validate_param('11', PARAM_FLOAT);

        validate_param('+.1', PARAM_FLOAT);

        validate_param('-.1', PARAM_FLOAT);

        validate_param('1e10', PARAM_FLOAT);

        validate_param('.1e+10', PARAM_FLOAT);

        validate_param('1E-1', PARAM_FLOAT);

        try {

            $param = validate_param('1,2', PARAM_FLOAT);

            $this->fail('invalid_parameter_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('invalid_parameter_exception', $ex);

        }

        try {

            $param = validate_param('', PARAM_FLOAT);

            $this->fail('invalid_parameter_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('invalid_parameter_exception', $ex);

        }

        try {

            $param = validate_param('.', PARAM_FLOAT);

            $this->fail('invalid_parameter_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('invalid_parameter_exception', $ex);

        }

        try {

            $param = validate_param('e10', PARAM_FLOAT);

            $this->fail('invalid_parameter_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('invalid_parameter_exception', $ex);

        }

        try {

            $param = validate_param('abc', PARAM_FLOAT);

            $this->fail('invalid_parameter_exception expected');

        } catch (\moodle_exception $ex) {

            $this->assertInstanceOf('invalid_parameter_exception', $ex);

        }

    }

    public function test_shorten_text_no_tags_already_short_enough(): void {

        // ......12345678901234567890123456.

        $text = "short text already no tags";

        $this->assertSame($text, shorten_text($text));

    }

    public function test_shorten_text_with_tags_already_short_enough(): void {

        // .........123456...7890....12345678.......901234567.

        $text = "<p>short <b>text</b> already</p><p>with tags</p>";

        $this->assertSame($text, shorten_text($text));

    }