<?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;
/**
> 
 * Unit tests for /lib/externallib.php.
> // phpcs:disable moodle.PHPUnit.TestCaseNames.Missing



<  * Unit tests for /lib/externallib.php.



>  * Just a wrapper to access protected apis for testing.
>  *
>  * Note: This is deprecated. Please use Reflection instead.


 * @package    core
 * @subpackage phpunit
 * @copyright  2009 Petr Skoda {@link http://skodak.org}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

< 
< defined('MOODLE_INTERNAL') || die();
< 
< global $CFG;
< require_once($CFG->libdir . '/externallib.php');
< 
< 
< class core_externallib_testcase extends advanced_testcase {
<     protected $DB;
< 
<     public function setUp(): void {
<         $this->DB = null;
<     }
< 
<     public function tearDown(): void {
<         global $DB;
<         if ($this->DB !== null) {
<             $DB = $this->DB;
<         }
<     }
< 
<     /**
<      * Tests for external_settings class.
<      */
<     public function test_external_settings() {
< 
<         $settings = \external_settings::get_instance();
<         $currentraw = $settings->get_raw();
<         $currentfilter = $settings->get_filter();
<         $currentfile = $settings->get_file();
<         $currentfileurl = $settings->get_fileurl();
< 
<         $this->assertInstanceOf('external_settings', $settings);
< 
<         // Check apis.
<         $settings->set_file('plugin.php');
<         $this->assertEquals('plugin.php', $settings->get_file());
<         $settings->set_filter(false);
<         $this->assertFalse($settings->get_filter());
<         $settings->set_fileurl(false);
<         $this->assertFalse($settings->get_fileurl());
<         $settings->set_raw(true);
<         $this->assertTrue($settings->get_raw());
< 
<         // Restore original values.
<         $settings->set_file($currentfile);
<         $settings->set_filter($currentfilter);
<         $settings->set_fileurl($currentfileurl);
<         $settings->set_raw($currentraw);
<     }
< 
<     public function test_validate_params() {
<         $params = array('text'=>'aaa', 'someid'=>'6');
<         $description = new external_function_parameters(array('someid' => new external_value(PARAM_INT, 'Some int value'),
<             'text'   => new external_value(PARAM_ALPHA, 'Some text value')));
<         $result = external_api::validate_parameters($description, $params);
<         $this->assertCount(2, $result);
<         reset($result);
<         $this->assertSame('someid', key($result));
<         $this->assertSame(6, $result['someid']);
<         $this->assertSame('aaa', $result['text']);
< 
<         $params = array('someids'=>array('1', 2, 'a'=>'3'), 'scalar'=>666);
<         $description = new external_function_parameters(array('someids' => new external_multiple_structure(new external_value(PARAM_INT, 'Some ID')),
<             'scalar'  => new external_value(PARAM_ALPHANUM, 'Some text value')));
<         $result = external_api::validate_parameters($description, $params);
<         $this->assertCount(2, $result);
<         reset($result);
<         $this->assertSame('someids', key($result));
<         $this->assertEquals(array(0=>1, 1=>2, 2=>3), $result['someids']);
<         $this->assertSame('666', $result['scalar']);
< 
<         $params = array('text'=>'aaa');
<         $description = new external_function_parameters(array('someid' => new external_value(PARAM_INT, 'Some int value', false),
<             'text'   => new external_value(PARAM_ALPHA, 'Some text value')));
<         $result = external_api::validate_parameters($description, $params);
<         $this->assertCount(2, $result);
<         reset($result);
<         $this->assertSame('someid', key($result));
<         $this->assertNull($result['someid']);
<         $this->assertSame('aaa', $result['text']);
< 
<         $params = array('text'=>'aaa');
<         $description = new external_function_parameters(array('someid' => new external_value(PARAM_INT, 'Some int value', false, 6),
<             'text'   => new external_value(PARAM_ALPHA, 'Some text value')));
<         $result = external_api::validate_parameters($description, $params);
<         $this->assertCount(2, $result);
<         reset($result);
<         $this->assertSame('someid', key($result));
<         $this->assertSame(6, $result['someid']);
<         $this->assertSame('aaa', $result['text']);
<     }
< 
<     public function test_external_format_text() {
<         $settings = external_settings::get_instance();
< 
<         $currentraw = $settings->get_raw();
<         $currentfilter = $settings->get_filter();
< 
<         $settings->set_raw(true);
<         $settings->set_filter(false);
<         $context = context_system::instance();
< 
<         $test = '$$ \pi $$';
<         $testformat = FORMAT_MARKDOWN;
<         $correct = array($test, $testformat);
<         // Function external_format_text should work with context id or context instance.
<         $this->assertSame(external_format_text($test, $testformat, $context->id, 'core', '', 0), $correct);
<         $this->assertSame(external_format_text($test, $testformat, $context, 'core', '', 0), $correct);
< 
<         $settings->set_raw(false);
<         $settings->set_filter(true);
< 
<         $test = '$$ \pi $$';
<         $testformat = FORMAT_MARKDOWN;
<         $correct = array('<span class="filter_mathjaxloader_equation"><p><span class="nolink">$$ \pi $$</span></p>
< </span>', FORMAT_HTML);
<         // Function external_format_text should work with context id or context instance.
<         $this->assertSame(external_format_text($test, $testformat, $context->id, 'core', '', 0), $correct);
<         $this->assertSame(external_format_text($test, $testformat, $context, 'core', '', 0), $correct);
< 
<         // Filters can be opted out from by the developer.
<         $test = '$$ \pi $$';
<         $testformat = FORMAT_MARKDOWN;
<         $correct = array('<p>$$ \pi $$</p>
< ', FORMAT_HTML);
<         // Function external_format_text should work with context id or context instance.
<         $this->assertSame(external_format_text($test, $testformat, $context->id, 'core', '', 0, ['filter' => false]), $correct);
<         $this->assertSame(external_format_text($test, $testformat, $context, 'core', '', 0, ['filter' => false]), $correct);
< 
<         $test = '<p><a id="test"></a><a href="#test">Text</a></p>';
<         $testformat = FORMAT_HTML;
<         $correct = array($test, FORMAT_HTML);
<         $options = array('allowid' => true);
<         // Function external_format_text should work with context id or context instance.
<         $this->assertSame(external_format_text($test, $testformat, $context->id, 'core', '', 0, $options), $correct);
<         $this->assertSame(external_format_text($test, $testformat, $context, 'core', '', 0, $options), $correct);
< 
<         $test = '<p><a id="test"></a><a href="#test">Text</a></p>';
<         $testformat = FORMAT_HTML;
<         $correct = array('<p><a></a><a href="#test">Text</a></p>', FORMAT_HTML);
<         $options = new StdClass();
<         $options->allowid = false;
<         // Function external_format_text should work with context id or context instance.
<         $this->assertSame(external_format_text($test, $testformat, $context->id, 'core', '', 0, $options), $correct);
<         $this->assertSame(external_format_text($test, $testformat, $context, 'core', '', 0, $options), $correct);
< 
<         $test = '<p><a id="test"></a><a href="#test">Text</a></p>'."\n".'Newline';
<         $testformat = FORMAT_MOODLE;
<         $correct = array('<p><a id="test"></a><a href="#test">Text</a></p> Newline', FORMAT_HTML);
<         $options = new StdClass();
<         $options->newlines = false;
<         // Function external_format_text should work with context id or context instance.
<         $this->assertSame(external_format_text($test, $testformat, $context->id, 'core', '', 0, $options), $correct);
<         $this->assertSame(external_format_text($test, $testformat, $context, 'core', '', 0, $options), $correct);
< 
<         $test = '<p><a id="test"></a><a href="#test">Text</a></p>';
<         $testformat = FORMAT_MOODLE;
<         $correct = array('<div class="text_to_html">'.$test.'</div>', FORMAT_HTML);
<         $options = new StdClass();
<         $options->para = true;
<         // Function external_format_text should work with context id or context instance.
<         $this->assertSame(external_format_text($test, $testformat, $context->id, 'core', '', 0, $options), $correct);
<         $this->assertSame(external_format_text($test, $testformat, $context, 'core', '', 0, $options), $correct);
< 
<         $test = '<p><a id="test"></a><a href="#test">Text</a></p>';
<         $testformat = FORMAT_MOODLE;
<         $correct = array($test, FORMAT_HTML);
<         $options = new StdClass();
<         $options->context = $context;
<         // Function external_format_text should work with context id or context instance.
<         $this->assertSame(external_format_text($test, $testformat, $context->id, 'core', '', 0, $options), $correct);
<         $this->assertSame(external_format_text($test, $testformat, $context, 'core', '', 0, $options), $correct);
< 
<         $settings->set_raw($currentraw);
<         $settings->set_filter($currentfilter);
<     }
< 
<     public function test_external_format_string() {
<         $this->resetAfterTest();
<         $settings = external_settings::get_instance();
<         $currentraw = $settings->get_raw();
<         $currentfilter = $settings->get_filter();
< 
<         // Enable multilang filter to on content and heading.
<         filter_set_global_state('multilang', TEXTFILTER_ON);
<         filter_set_applies_to_strings('multilang', 1);
<         $filtermanager = filter_manager::instance();
<         $filtermanager->reset_caches();
< 
<         $settings->set_raw(true);
<         $settings->set_filter(true);
<         $context = context_system::instance();
< 
<         $test = '<span lang="en" class="multilang">EN</span><span lang="fr" class="multilang">FR</span> ' .
<             '<script>hi</script> <h3>there</h3>!';
<         $correct = $test;
<         // Function external_format_string should work with context id or context instance.
<         $this->assertSame($correct, external_format_string($test, $context->id));
<         $this->assertSame($correct, external_format_string($test, $context));
< 
<         $settings->set_raw(false);
<         $settings->set_filter(false);
< 
<         $test = '<span lang="en" class="multilang">EN</span><span lang="fr" class="multilang">FR</span> ' .
<             '<script>hi</script> <h3>there</h3>?';
<         $correct = 'ENFR hi there?';
<         // Function external_format_string should work with context id or context instance.
<         $this->assertSame($correct, external_format_string($test, $context->id));
<         $this->assertSame($correct, external_format_string($test, $context));
< 
<         $settings->set_filter(true);
< 
<         $test = '<span lang="en" class="multilang">EN</span><span lang="fr" class="multilang">FR</span> ' .
<             '<script>hi</script> <h3>there</h3>@';
<         $correct = 'EN hi there@';
<         // Function external_format_string should work with context id or context instance.
<         $this->assertSame($correct, external_format_string($test, $context->id));
<         $this->assertSame($correct, external_format_string($test, $context));
< 
<         // Filters can be opted out.
<         $test = '<span lang="en" class="multilang">EN</span><span lang="fr" class="multilang">FR</span> ' .
<             '<script>hi</script> <h3>there</h3>%';
<         $correct = 'ENFR hi there%';
<         // Function external_format_string should work with context id or context instance.
<         $this->assertSame($correct, external_format_string($test, $context->id, false, ['filter' => false]));
<         $this->assertSame($correct, external_format_string($test, $context, false, ['filter' => false]));
< 
<         $this->assertSame("& < > \" '", format_string("& < > \" '", true, ['escape' => false]));
< 
<         $settings->set_raw($currentraw);
<         $settings->set_filter($currentfilter);
<     }
< 
<     /**
<      * Test for clean_returnvalue() for testing that returns the PHP type.
<      */
<     public function test_clean_returnvalue_return_php_type() {
< 
<         $returndesc = new external_single_structure(
<             array(
<                 'value' => new external_value(PARAM_RAW, 'Some text', VALUE_OPTIONAL, null, NULL_NOT_ALLOWED)
<             )



> class test_exernal_api extends \core_external\external_api {
>     public static function get_context_wrapper($params) {
>         debugging(
>             'test_exernal_api::get_context_wrapper() is deprecated. Please use Reflection instead.',
>             DEBUG_DEVELOPER


        );

< 
<         // Check return type on exception because the external values does not allow NULL values.
<         $testdata = array('value' => null);
<         try {
<             $cleanedvalue = external_api::clean_returnvalue($returndesc, $testdata);
<         } catch (moodle_exception $e) {
<             $this->assertInstanceOf('invalid_response_exception', $e);
<             $this->assertStringContainsString('of PHP type "NULL"', $e->debuginfo);
<         }
<     }
< 
<     /**
<      * Test for clean_returnvalue().
<      */
<     public function test_clean_returnvalue() {
< 
<         // Build some return value decription.
<         $returndesc = new external_multiple_structure(
<             new external_single_structure(
<                 array(
<                     'object' => new external_single_structure(
<                                 array('value1' => new external_value(PARAM_INT, 'this is a int'))),
<                     'value2' => new external_value(PARAM_TEXT, 'some text', VALUE_OPTIONAL))
<             ));
< 
<         // Clean an object (it should be cast into an array).
<         $object = new stdClass();
<         $object->value1 = 1;
<         $singlestructure['object'] = $object;
<         $singlestructure['value2'] = 'Some text';
<         $testdata = array($singlestructure);
<         $cleanedvalue = external_api::clean_returnvalue($returndesc, $testdata);
<         $cleanedsinglestructure = array_pop($cleanedvalue);
<         $this->assertSame($object->value1, $cleanedsinglestructure['object']['value1']);
<         $this->assertSame($singlestructure['value2'], $cleanedsinglestructure['value2']);
< 
<         // Missing VALUE_OPTIONAL.
<         $object = new stdClass();
<         $object->value1 = 1;
<         $singlestructure = new stdClass();
<         $singlestructure->object = $object;
<         $testdata = array($singlestructure);
<         $cleanedvalue = external_api::clean_returnvalue($returndesc, $testdata);
<         $cleanedsinglestructure = array_pop($cleanedvalue);
<         $this->assertSame($object->value1, $cleanedsinglestructure['object']['value1']);
<         $this->assertArrayNotHasKey('value2', $cleanedsinglestructure);
< 
<         // Unknown attribute (the value should be ignored).
<         $object = array();
<         $object['value1'] = 1;
<         $singlestructure = array();
<         $singlestructure['object'] = $object;
<         $singlestructure['value2'] = 'Some text';
<         $singlestructure['unknownvalue'] = 'Some text to ignore';
<         $testdata = array($singlestructure);
<         $cleanedvalue = external_api::clean_returnvalue($returndesc, $testdata);
<         $cleanedsinglestructure = array_pop($cleanedvalue);
<         $this->assertSame($object['value1'], $cleanedsinglestructure['object']['value1']);
<         $this->assertSame($singlestructure['value2'], $cleanedsinglestructure['value2']);
<         $this->assertArrayNotHasKey('unknownvalue', $cleanedsinglestructure);
< 
<         // Missing required value (an exception is thrown).
<         $object = array();
<         $singlestructure = array();
<         $singlestructure['object'] = $object;
<         $singlestructure['value2'] = 'Some text';
<         $testdata = array($singlestructure);
<         $this->expectException('invalid_response_exception');
<         $cleanedvalue = external_api::clean_returnvalue($returndesc, $testdata);
<     }
<     /*
<      * Test external_api::get_context_from_params().
<      */
<     public function test_get_context_from_params() {
<         $this->resetAfterTest(true);
<         $course = $this->getDataGenerator()->create_course();
<         $realcontext = context_course::instance($course->id);
< 
<         // Use context id.
<         $fetchedcontext = test_exernal_api::get_context_wrapper(array("contextid" => $realcontext->id));
<         $this->assertEquals($realcontext, $fetchedcontext);
< 
<         // Use context level and instance id.
<         $fetchedcontext = test_exernal_api::get_context_wrapper(array("contextlevel" => "course", "instanceid" => $course->id));
<         $this->assertEquals($realcontext, $fetchedcontext);
< 
<         // Passing empty values.
<         try {
<             $fetchedcontext = test_exernal_api::get_context_wrapper(array("contextid" => 0));
<             $this->fail('Exception expected from get_context_wrapper()');
<         } catch (moodle_exception $e) {
<             $this->assertInstanceOf('invalid_parameter_exception', $e);
<         }
< 
<         try {
<             $fetchedcontext = test_exernal_api::get_context_wrapper(array("instanceid" => 0));
<             $this->fail('Exception expected from get_context_wrapper()');
<         } catch (moodle_exception $e) {
<             $this->assertInstanceOf('invalid_parameter_exception', $e);
<         }
< 
<         try {
<             $fetchedcontext = test_exernal_api::get_context_wrapper(array("contextid" => null));
<             $this->fail('Exception expected from get_context_wrapper()');
<         } catch (moodle_exception $e) {
<             $this->assertInstanceOf('invalid_parameter_exception', $e);
<         }
< 
<         // Tests for context with instanceid equal to 0 (System context).
<         $realcontext = context_system::instance();
<         $fetchedcontext = test_exernal_api::get_context_wrapper(array("contextlevel" => "system", "instanceid" => 0));
<         $this->assertEquals($realcontext, $fetchedcontext);
< 
<         // Passing wrong level.
<         $this->expectException('invalid_parameter_exception');
<         $fetchedcontext = test_exernal_api::get_context_wrapper(array("contextlevel" => "random", "instanceid" => $course->id));
<     }
< 
<     /*
<      * Test external_api::get_context()_from_params parameter validation.
<      */
<     public function test_get_context_params() {
<         global $USER;
< 
<         // Call without correct context details.
<         $this->expectException('invalid_parameter_exception');
<         test_exernal_api::get_context_wrapper(array('roleid' => 3, 'userid' => $USER->id));
<     }
< 
<     /*
<      * Test external_api::get_context()_from_params parameter validation.
<      */
<     public function test_get_context_params2() {
<         global $USER;
< 
<         // Call without correct context details.
<         $this->expectException('invalid_parameter_exception');
<         test_exernal_api::get_context_wrapper(array('roleid' => 3, 'userid' => $USER->id, 'contextlevel' => "course"));
<     }
< 
<     /*
<      * Test external_api::get_context()_from_params parameter validation.
<      */
<     public function test_get_context_params3() {
<         global $USER;
< 
<         // Call without correct context details.
<         $this->resetAfterTest(true);
<         $course = self::getDataGenerator()->create_course();
<         $this->expectException('invalid_parameter_exception');
<         test_exernal_api::get_context_wrapper(array('roleid' => 3, 'userid' => $USER->id, 'instanceid' => $course->id));
<     }
< 
<     public function all_external_info_provider() {
<         global $DB;
< 
<         // We are testing here that all the external function descriptions can be generated without
<         // producing warnings. E.g. misusing optional params will generate a debugging message which
<         // will fail this test.
<         $functions = $DB->get_records('external_functions', array(), 'name');
<         $return = array();
<         foreach ($functions as $f) {
<             $return[$f->name] = array($f);



>         return self::get_context_from_params($params);


        }

<         return $return;


    }

    /**

<      * @dataProvider all_external_info_provider
<      */
<     public function test_all_external_info($f) {
<         $desc = external_api::external_function_info($f);
<         $this->assertNotEmpty($desc->name);
<         $this->assertNotEmpty($desc->classname);
<         $this->assertNotEmpty($desc->methodname);
<         $this->assertEquals($desc->component, clean_param($desc->component, PARAM_COMPONENT));
<         $this->assertInstanceOf('external_function_parameters', $desc->parameters_desc);
<         if ($desc->returns_desc != null) {
<             $this->assertInstanceOf('external_description', $desc->returns_desc);
<         }
<     }
< 
<     public function test_validate_courses() {
<         $this->resetAfterTest(true);
< 
<         $c1 = $this->getDataGenerator()->create_course();
<         $c2 = $this->getDataGenerator()->create_course();
<         $c3 = $this->getDataGenerator()->create_course();
<         $u1 = $this->getDataGenerator()->create_user();
<         $this->getDataGenerator()->enrol_user($u1->id, $c1->id);
<         $courseids = array($c1->id, $c2->id, $c3->id);
< 
<         $this->setAdminUser();
<         list($courses, $warnings) = external_util::validate_courses($courseids);
<         $this->assertEmpty($warnings);
<         $this->assertCount(3, $courses);
<         $this->assertArrayHasKey($c1->id, $courses);
<         $this->assertArrayHasKey($c2->id, $courses);
<         $this->assertArrayHasKey($c3->id, $courses);
<         $this->assertEquals($c1->id, $courses[$c1->id]->id);
<         $this->assertEquals($c2->id, $courses[$c2->id]->id);
<         $this->assertEquals($c3->id, $courses[$c3->id]->id);
< 
<         $this->setUser($u1);
<         list($courses, $warnings) = external_util::validate_courses($courseids);
<         $this->assertCount(2, $warnings);
<         $this->assertEquals($c2->id, $warnings[0]['itemid']);
<         $this->assertEquals($c3->id, $warnings[1]['itemid']);
<         $this->assertCount(1, $courses);
<         $this->assertArrayHasKey($c1->id, $courses);
<         $this->assertArrayNotHasKey($c2->id, $courses);
<         $this->assertArrayNotHasKey($c3->id, $courses);
<         $this->assertEquals($c1->id, $courses[$c1->id]->id);
<     }
< 
<     /**
<      * Validate courses, but still return courses even if they fail validation.



>  * Test external API functions.
>  *
>  * @package core
>  * @subpackage phpunit


     */

<     public function test_validate_courses_keepfails() {
<         $this->resetAfterTest(true);
< 
<         $c1 = $this->getDataGenerator()->create_course();
<         $c2 = $this->getDataGenerator()->create_course();
<         $c3 = $this->getDataGenerator()->create_course();
<         $u1 = $this->getDataGenerator()->create_user();
<         $this->getDataGenerator()->enrol_user($u1->id, $c1->id);
<         $courseids = array($c1->id, $c2->id, $c3->id);
< 
<         $this->setUser($u1);
<         list($courses, $warnings) = external_util::validate_courses($courseids, [], false, true);
<         $this->assertCount(2, $warnings);
<         $this->assertEquals($c2->id, $warnings[0]['itemid']);
<         $this->assertEquals($c3->id, $warnings[1]['itemid']);
<         $this->assertCount(3, $courses);
<         $this->assertTrue($courses[$c1->id]->contextvalidated);
<         $this->assertFalse($courses[$c2->id]->contextvalidated);
<         $this->assertFalse($courses[$c3->id]->contextvalidated);
<     }
< 



> class core_externallib_test extends \advanced_testcase {


    /**

<      * Validate courses can re-use an array of prefetched courses.



>      * Test the get_context_wrapper helper.
>      *
>      * @covers \core\test_exernal_api::get_context_wrapper


     */

<     public function test_validate_courses_prefetch() {
<         $this->resetAfterTest(true);
< 
<         $c1 = $this->getDataGenerator()->create_course();
<         $c2 = $this->getDataGenerator()->create_course();
<         $c3 = $this->getDataGenerator()->create_course();
<         $c4 = $this->getDataGenerator()->create_course();
<         $u1 = $this->getDataGenerator()->create_user();
<         $this->getDataGenerator()->enrol_user($u1->id, $c1->id);
<         $this->getDataGenerator()->enrol_user($u1->id, $c2->id);
< 
<         $courseids = array($c1->id, $c2->id, $c3->id);
<         $courses = array($c2->id => $c2, $c3->id => $c3, $c4->id => $c4);
< 
<         $this->setUser($u1);
<         list($courses, $warnings) = external_util::validate_courses($courseids, $courses);
<         $this->assertCount(2, $courses);
<         $this->assertCount(1, $warnings);
<         $this->assertArrayHasKey($c1->id, $courses);
<         $this->assertSame($c2, $courses[$c2->id]);
<         $this->assertArrayNotHasKey($c3->id, $courses);
<         // The extra course passed is not returned.
<         $this->assertArrayNotHasKey($c4->id, $courses);
<     }
< 
< 
<     public function test_call_external_function() {
<         global $PAGE, $COURSE, $CFG;
< 
<         $this->resetAfterTest(true);
< 
<         // Call some webservice functions and verify they are correctly handling $PAGE and $COURSE.
<         // First test a function that calls validate_context outside a course.
<         $this->setAdminUser();
<         $category = $this->getDataGenerator()->create_category();
<         $params = array(
<             'contextid' => context_coursecat::instance($category->id)->id,
<             'name' => 'aaagrrryyy',
<             'idnumber' => '',
<             'description' => ''



>     public function test_get_context_wrapper(): void {
>         $this->assertEquals(
>             \context_system::instance(),
>             \core\test_exernal_api::get_context_wrapper(['contextid' => \context_system::instance()->id])


        );

<         $cohort1 = $this->getDataGenerator()->create_cohort($params);
<         $cohort2 = $this->getDataGenerator()->create_cohort();
< 
<         $beforepage = $PAGE;
<         $beforecourse = $COURSE;
<         $params = array('cohortids' => array($cohort1->id, $cohort2->id));
<         $result = external_api::call_external_function('core_cohort_get_cohorts', $params);
< 
<         $this->assertSame($beforepage, $PAGE);
<         $this->assertSame($beforecourse, $COURSE);
< 
<         // Now test a function that calls validate_context inside a course.
<         $course = $this->getDataGenerator()->create_course();
< 
<         $beforepage = $PAGE;
<         $beforecourse = $COURSE;
<         $params = array('courseid' => $course->id, 'options' => array());
<         $result = external_api::call_external_function('core_enrol_get_enrolled_users', $params);
< 
<         $this->assertSame($beforepage, $PAGE);
<         $this->assertSame($beforecourse, $COURSE);
< 
<         // Test a function that triggers a PHP exception.
<         require_once($CFG->dirroot . '/lib/tests/fixtures/test_external_function_throwable.php');
< 
<         // Call our test function.
<         $result = test_external_function_throwable::call_external_function('core_throw_exception', array(), false);
< 
<         $this->assertTrue($result['error']);
<         $this->assertArrayHasKey('exception', $result);
<         $this->assertEquals($result['exception']->message, 'Exception - Modulo by zero');
<     }
< 
<     /**
<      * Text external_util::get_area_files
<      */
<     public function test_external_util_get_area_files() {
<         global $CFG, $DB;
< 
<         $this->DB = $DB;
<         $DB = $this->getMockBuilder('moodle_database')->getMock();
< 
<         $content = base64_encode("Let us create a nice simple file.");
<         $timemodified = 102030405;
<         $itemid = 42;
<         $filesize = strlen($content);
< 
<         $DB->method('get_records_sql')->willReturn([
<             (object) [
<                 'filename'      => 'example.txt',
<                 'filepath'      => '/',
<                 'mimetype'      => 'text/plain',
<                 'filesize'      => $filesize,
<                 'timemodified'  => $timemodified,
<                 'itemid'        => $itemid,
<                 'pathnamehash'  => sha1('/example.txt'),
<             ],
<         ]);
< 
<         $component = 'mod_foo';
<         $filearea = 'area';
<         $context = 12345;
< 
<         $expectedfiles[] = array(
<             'filename' => 'example.txt',
<             'filepath' => '/',
<             'fileurl' => "{$CFG->wwwroot}/webservice/pluginfile.php/{$context}/{$component}/{$filearea}/{$itemid}/example.txt",
<             'timemodified' => $timemodified,
<             'filesize' => $filesize,
<             'mimetype' => 'text/plain',
<             'isexternalfile' => false,



>         $this->assertDebuggingCalled(
>             'test_exernal_api::get_context_wrapper() is deprecated. Please use Reflection instead.'


        );

<         // Get all the files for the area.
<         $files = external_util::get_area_files($context, $component, $filearea, false);
<         $this->assertEquals($expectedfiles, $files);
< 
<         $DB->method('get_in_or_equal')->willReturn([
<             '= :mock1',
<             ['mock1' => $itemid]
<         ]);
< 
<         // Get just the file indicated by $itemid.
<         $files = external_util::get_area_files($context, $component, $filearea, $itemid);
<         $this->assertEquals($expectedfiles, $files);
< 
<     }
< 
<     /**
<      * Text external files structure.
<      */
<     public function test_external_files() {
< 
<         $description = new external_files();
< 
<         // First check that the expected default values and keys are returned.
<         $expectedkeys = array_flip(array('filename', 'filepath', 'filesize', 'fileurl', 'timemodified', 'mimetype',
<             'isexternalfile', 'repositorytype'));
<         $returnedkeys = array_flip(array_keys($description->content->keys));
<         $this->assertEquals($expectedkeys, $returnedkeys);
<         $this->assertEquals('List of files.', $description->desc);
<         $this->assertEquals(VALUE_REQUIRED, $description->required);
<         foreach ($description->content->keys as $key) {
<             $this->assertEquals(VALUE_OPTIONAL, $key->required);
<         }
< 
<     }
< 
<     /**
<      * Test default time for user created tokens.
<      */
<     public function test_user_created_tokens_duration() {
<         global $CFG, $DB;
<         $this->resetAfterTest(true);
< 
<         $CFG->enablewebservices = 1;
<         $CFG->enablemobilewebservice = 1;
<         $user1 = $this->getDataGenerator()->create_user();
<         $user2 = $this->getDataGenerator()->create_user();
<         $service = $DB->get_record('external_services', array('shortname' => MOODLE_OFFICIAL_MOBILE_SERVICE, 'enabled' => 1));
< 
<         $this->setUser($user1);
<         $timenow = time();
<         $token = external_generate_token_for_current_user($service);
<         $this->assertGreaterThanOrEqual($timenow + $CFG->tokenduration, $token->validuntil);
< 
<         // Change token default time.
<         $this->setUser($user2);
<         set_config('tokenduration', DAYSECS);
<         $token = external_generate_token_for_current_user($service);
<         $timenow = time();
<         $this->assertLessThanOrEqual($timenow + DAYSECS, $token->validuntil);
<     }
< }
< 
< /*
<  * Just a wrapper to access protected apis for testing
<  */
< class test_exernal_api extends external_api {
< 
<     public static function get_context_wrapper($params) {
<         return self::get_context_from_params($params);


    }
}