<?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 enrol_self;

use context_course;
use enrol_self_plugin;

defined('MOODLE_INTERNAL') || die();

global $CFG;
require_once($CFG->dirroot.'/enrol/self/lib.php');
require_once($CFG->dirroot.'/enrol/self/locallib.php');

/**
 * Self enrolment plugin tests.
 *
 * @package    enrol_self
 * @category   phpunit
 * @copyright  2012 Petr Skoda {@link http://skodak.org}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @coversDefaultClass \enrol_self_plugin
 */
final class self_test extends \advanced_testcase {

    public function test_basics(): void {
        $this->assertTrue(enrol_is_enabled('self'));
        $plugin = enrol_get_plugin('self');
        $this->assertInstanceOf('enrol_self_plugin', $plugin);
        $this->assertEquals(1, get_config('enrol_self', 'defaultenrol'));
        $this->assertEquals(ENROL_EXT_REMOVED_KEEP, get_config('enrol_self', 'expiredaction'));
    }

    public function test_sync_nothing(): void {
        global $SITE;

        $selfplugin = enrol_get_plugin('self');

        $trace = new \null_progress_trace();

        // Just make sure the sync does not throw any errors when nothing to do.
        $selfplugin->sync($trace, null);
        $selfplugin->sync($trace, $SITE->id);
    }

    public function test_longtimnosee(): void {
        global $DB;
        $this->resetAfterTest();

        $selfplugin = enrol_get_plugin('self');
        $manualplugin = enrol_get_plugin('manual');
        $this->assertNotEmpty($manualplugin);

        $now = time();

        $trace = new \progress_trace_buffer(new \text_progress_trace(), false);

        // Prepare some data.

        $studentrole = $DB->get_record('role', array('shortname'=>'student'));
        $this->assertNotEmpty($studentrole);
        $teacherrole = $DB->get_record('role', array('shortname'=>'teacher'));
        $this->assertNotEmpty($teacherrole);

        $record = array('firstaccess'=>$now-60*60*24*800);
        $record['lastaccess'] = $now-60*60*24*100;
        $user1 = $this->getDataGenerator()->create_user($record);
        $record['lastaccess'] = $now-60*60*24*10;
        $user2 = $this->getDataGenerator()->create_user($record);
        $record['lastaccess'] = $now-60*60*24*1;
        $user3 = $this->getDataGenerator()->create_user($record);
        $record['lastaccess'] = $now-10;
        $user4 = $this->getDataGenerator()->create_user($record);

        $course1 = $this->getDataGenerator()->create_course();
        $course2 = $this->getDataGenerator()->create_course();
        $course3 = $this->getDataGenerator()->create_course();
        $context1 = \context_course::instance($course1->id);
        $context2 = \context_course::instance($course2->id);
        $context3 = \context_course::instance($course3->id);

        $this->assertEquals(3, $DB->count_records('enrol', array('enrol'=>'self')));
        $instance1 = $DB->get_record('enrol', array('courseid'=>$course1->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance2 = $DB->get_record('enrol', array('courseid'=>$course2->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance3 = $DB->get_record('enrol', array('courseid'=>$course3->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $id = $selfplugin->add_instance($course3, array('status'=>ENROL_INSTANCE_ENABLED, 'roleid'=>$teacherrole->id));
        $instance3b = $DB->get_record('enrol', array('id'=>$id), '*', MUST_EXIST);
        unset($id);

        $this->assertEquals($studentrole->id, $instance1->roleid);
        $instance1->customint2 = 60*60*24*14;
        $DB->update_record('enrol', $instance1);
        $selfplugin->enrol_user($instance1, $user1->id, $studentrole->id);
        $selfplugin->enrol_user($instance1, $user2->id, $studentrole->id);
        $selfplugin->enrol_user($instance1, $user3->id, $studentrole->id);
        $this->assertEquals(3, $DB->count_records('user_enrolments'));
        $DB->insert_record('user_lastaccess', array('userid'=>$user2->id, 'courseid'=>$course1->id, 'timeaccess'=>$now-60*60*24*20));
        $DB->insert_record('user_lastaccess', array('userid'=>$user3->id, 'courseid'=>$course1->id, 'timeaccess'=>$now-60*60*24*2));
        $DB->insert_record('user_lastaccess', array('userid'=>$user4->id, 'courseid'=>$course1->id, 'timeaccess'=>$now-60));

        $this->assertEquals($studentrole->id, $instance3->roleid);
        $instance3->customint2 = 60*60*24*50;
        $DB->update_record('enrol', $instance3);
        $selfplugin->enrol_user($instance3, $user1->id, $studentrole->id);
        $selfplugin->enrol_user($instance3, $user2->id, $studentrole->id);
        $selfplugin->enrol_user($instance3, $user3->id, $studentrole->id);
        $selfplugin->enrol_user($instance3b, $user1->id, $teacherrole->id);
        $selfplugin->enrol_user($instance3b, $user4->id, $teacherrole->id);
        $this->assertEquals(8, $DB->count_records('user_enrolments'));
        $DB->insert_record('user_lastaccess', array('userid'=>$user2->id, 'courseid'=>$course3->id, 'timeaccess'=>$now-60*60*24*11));
        $DB->insert_record('user_lastaccess', array('userid'=>$user3->id, 'courseid'=>$course3->id, 'timeaccess'=>$now-60*60*24*200));
        $DB->insert_record('user_lastaccess', array('userid'=>$user4->id, 'courseid'=>$course3->id, 'timeaccess'=>$now-60*60*24*200));

        $maninstance2 = $DB->get_record('enrol', array('courseid'=>$course2->id, 'enrol'=>'manual'), '*', MUST_EXIST);
        $maninstance3 = $DB->get_record('enrol', array('courseid'=>$course3->id, 'enrol'=>'manual'), '*', MUST_EXIST);

        $manualplugin->enrol_user($maninstance2, $user1->id, $studentrole->id);
        $manualplugin->enrol_user($maninstance3, $user1->id, $teacherrole->id);

        $this->assertEquals(10, $DB->count_records('user_enrolments'));
        $this->assertEquals(9, $DB->count_records('role_assignments'));
        $this->assertEquals(7, $DB->count_records('role_assignments', array('roleid'=>$studentrole->id)));
        $this->assertEquals(2, $DB->count_records('role_assignments', array('roleid'=>$teacherrole->id)));

        // Execute sync - this is the same thing used from cron.

        $selfplugin->sync($trace, $course2->id);
        $output = $trace->get_buffer();
        $trace->reset_buffer();
        $this->assertEquals(10, $DB->count_records('user_enrolments'));
        $this->assertStringContainsString('No expired enrol_self enrolments detected', $output);
        $this->assertTrue($DB->record_exists('user_enrolments', array('enrolid'=>$instance1->id, 'userid'=>$user1->id)));
        $this->assertTrue($DB->record_exists('user_enrolments', array('enrolid'=>$instance1->id, 'userid'=>$user2->id)));
        $this->assertTrue($DB->record_exists('user_enrolments', array('enrolid'=>$instance3->id, 'userid'=>$user1->id)));
        $this->assertTrue($DB->record_exists('user_enrolments', array('enrolid'=>$instance3->id, 'userid'=>$user3->id)));

        $selfplugin->sync($trace, null);
        $output = $trace->get_buffer();
        $trace->reset_buffer();
        $this->assertEquals(6, $DB->count_records('user_enrolments'));
        $this->assertFalse($DB->record_exists('user_enrolments', array('enrolid'=>$instance1->id, 'userid'=>$user1->id)));
        $this->assertFalse($DB->record_exists('user_enrolments', array('enrolid'=>$instance1->id, 'userid'=>$user2->id)));
        $this->assertFalse($DB->record_exists('user_enrolments', array('enrolid'=>$instance3->id, 'userid'=>$user1->id)));
        $this->assertFalse($DB->record_exists('user_enrolments', array('enrolid'=>$instance3->id, 'userid'=>$user3->id)));
        $this->assertStringContainsString('unenrolling user ' . $user1->id . ' from course ' . $course1->id .
            ' as they did not log in for at least 14 days', $output);
        $this->assertStringContainsString('unenrolling user ' . $user1->id . ' from course ' . $course3->id .
            ' as they did not log in for at least 50 days', $output);
        $this->assertStringContainsString('unenrolling user ' . $user2->id . ' from course ' . $course1->id .
            ' as they did not access the course for at least 14 days', $output);
        $this->assertStringContainsString('unenrolling user ' . $user3->id . ' from course ' . $course3->id .
            ' as they did not access the course for at least 50 days', $output);
        $this->assertStringNotContainsString('unenrolling user ' . $user4->id, $output);

        $this->assertEquals(6, $DB->count_records('role_assignments'));
        $this->assertEquals(4, $DB->count_records('role_assignments', array('roleid'=>$studentrole->id)));
        $this->assertEquals(2, $DB->count_records('role_assignments', array('roleid'=>$teacherrole->id)));
    }

    /**
     * Data provider for longtimenosee notifications tests.
     *
     * @return array
     */
    public static function longtimenosee_notifications_provider(): array {

        return [
            'No inactive period' => [
                'expirynotify' => 1,
                'notifyall' => 1,
                'expirythreshold' => DAYSECS * 3,
                'customint2' => 0,
                'numnotifications' => 2,
                'progresstrace' => true,
            ],
            'Notifications disabled' => [
                'expirynotify' => 0,
                'notifyall' => 1,
                'expirythreshold' => DAYSECS * 3,
                'customint2' => WEEKSECS,
                'numnotifications' => 0,
                'progresstrace' => true,
            ],
            'Notifications enabled' => [
                'expirynotify' => 1,
                'notifyall' => 1,
                'expirythreshold' => DAYSECS * 3,
                'customint2' => WEEKSECS,
                'numnotifications' => 4,
                'progresstrace' => false,
            ],
        ];
    }

    /**
     * Tests for the inactivity unerol notification.
     *
     * Having enrolment duration (timeend) set to 0, the notifications about enrol expiration are not sent
     *
     * @dataProvider longtimenosee_notifications_provider
     * @covers ::send_expiry_notifications
     * @param   int         $expirynotify       Whether enrolment expiry notification messages are sent
     * @param   int         $notifyall          Whether teachers and students are notified or only teachers
     * @param   int         $expirythreshold    How long before expiry are users notified (seconds)
     * @param   int         $customint2         Time of inactivity before unerolling a user (seconds)
     * @param   int         $numnotifications   Expected number of notifications sent
     * @param   bool        $progresstrace      Progress tracing object
     * @return void
     */
    public function test_longtimenosee_notifications(
        int $expirynotify,
        int $notifyall,
        int $expirythreshold,
        int $customint2,
        int $numnotifications,
        bool $progresstrace,
    ): void {
        global $DB;
        $this->resetAfterTest();
        $this->preventResetByRollback(); // Messaging does not like transactions...

        $selfplugin = enrol_get_plugin('self');

        $now = time();
        $coursestartdate = $now - WEEKSECS * 4;

        $trace = new \null_progress_trace();

        // Note: hopefully nobody executes the unit tests the last second before midnight...
        $selfplugin->set_config('expirynotifylast', $now - DAYSECS);
        $selfplugin->set_config('expirynotifyhour', 0);

        $studentrole = $DB->get_record('role', ['shortname' => 'student']);
        $this->assertNotEmpty($studentrole);
        $editingteacherrole = $DB->get_record('role', ['shortname' => 'editingteacher']);
        $this->assertNotEmpty($editingteacherrole);
        $managerrole = $DB->get_record('role', ['shortname' => 'manager']);
        $this->assertNotEmpty($managerrole);

        $user1 = $this->getDataGenerator()->create_user(['lastname' => 'xuser1']);
        $user2 = $this->getDataGenerator()->create_user(['lastname' => 'xuser2']);
        $user3 = $this->getDataGenerator()->create_user(['lastname' => 'xuser3']);
        $user4 = $this->getDataGenerator()->create_user(['lastname' => 'xuser4']);

        $course1 = $this->getDataGenerator()->create_course(['fullname' => 'xcourse1', 'startdate' => $coursestartdate]);

        $instance1 = $DB->get_record('enrol', ['courseid' => $course1->id, 'enrol' => 'self'], '*', MUST_EXIST);
        $instance1->expirythreshold = $expirythreshold;
        $instance1->expirynotify    = $expirynotify;
        $instance1->notifyall       = $notifyall;
        $instance1->status          = ENROL_INSTANCE_ENABLED;
        $instance1->customint2      = $customint2;
        $DB->update_record('enrol', $instance1);

        // Suspended users are not notified.
        $selfplugin->enrol_user($instance1, $user1->id, $studentrole->id, $coursestartdate, 0, ENROL_USER_SUSPENDED);
        // User accessed recently - should not be notified.
        $selfplugin->enrol_user($instance1, $user2->id, $studentrole->id, $coursestartdate, 0);
        $DB->insert_record('user_lastaccess', ['userid' => $user2->id, 'courseid' => $course1->id, 'timeaccess' => $now -
            DAYSECS * 3]);
        // User accessed long time ago - should be notified.
        $selfplugin->enrol_user($instance1, $user3->id, $studentrole->id, $coursestartdate, $now + DAYSECS * 2 + HOURSECS);
        $DB->insert_record('user_lastaccess', ['userid' => $user3->id, 'courseid' => $course1->id, 'timeaccess' => $now
            - DAYSECS * 20]);
        // User has never accessed the course - should be notified.
        $selfplugin->enrol_user($instance1, $user4->id, $studentrole->id, $coursestartdate, 0);

        $sink = $this->redirectMessages();
        if ($progresstrace) {
            $selfplugin->send_expiry_notifications($trace);
        } else {
            // If $trace is not an instance of the progress_trace, then set it to false to test whether debugging is triggered.
            $selfplugin->send_expiry_notifications(false);
            $this->assertDebuggingCalled(
                'enrol_plugin::send_expiry_notifications() now expects progress_trace instance as parameter!'
            );
        }
        $messages = $sink->get_messages();

        $this->assertCount($numnotifications, $messages);
        if ($numnotifications && ($customint2 > 0)) {
            $this->assertEquals($user3->id, $messages[0]->useridto);
            $this->assertStringContainsString('you have not accessed', $messages[0]->fullmessagehtml);
        }

        // Make sure that notifications are not repeated.
        $sink->clear();

        // Test that no more messages are sent the same day.
        $selfplugin->send_expiry_notifications($trace);
        $messages = $sink->get_messages();

        $this->assertCount(0, $messages);

        // Test if an enrolment instance is disabled.
        $selfplugin->update_status($instance1, ENROL_INSTANCE_DISABLED);
        $this->assertNull($selfplugin->send_expiry_notifications($trace));
        $selfplugin->update_status($instance1, ENROL_INSTANCE_ENABLED);

        // Test if an expiry notify hour is null.
        $selfplugin->set_config('expirynotifyhour', null);
        $selfplugin->send_expiry_notifications($trace);
        $this->assertDebuggingCalled('send_expiry_notifications() in self enrolment plugin needs expirynotifyhour setting');
    }

    public function test_expired(): void {
        global $DB;
        $this->resetAfterTest();

        $selfplugin = enrol_get_plugin('self');
        $manualplugin = enrol_get_plugin('manual');
        $this->assertNotEmpty($manualplugin);

        $now = time();

        $trace = new \null_progress_trace();

        // Prepare some data.

        $studentrole = $DB->get_record('role', array('shortname'=>'student'));
        $this->assertNotEmpty($studentrole);
        $teacherrole = $DB->get_record('role', array('shortname'=>'teacher'));
        $this->assertNotEmpty($teacherrole);
        $managerrole = $DB->get_record('role', array('shortname'=>'manager'));
        $this->assertNotEmpty($managerrole);

        $user1 = $this->getDataGenerator()->create_user();
        $user2 = $this->getDataGenerator()->create_user();
        $user3 = $this->getDataGenerator()->create_user();
        $user4 = $this->getDataGenerator()->create_user();

        $course1 = $this->getDataGenerator()->create_course();
        $course2 = $this->getDataGenerator()->create_course();
        $course3 = $this->getDataGenerator()->create_course();
        $context1 = \context_course::instance($course1->id);
        $context2 = \context_course::instance($course2->id);
        $context3 = \context_course::instance($course3->id);

        $this->assertEquals(3, $DB->count_records('enrol', array('enrol'=>'self')));
        $instance1 = $DB->get_record('enrol', array('courseid'=>$course1->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $this->assertEquals($studentrole->id, $instance1->roleid);
        $instance2 = $DB->get_record('enrol', array('courseid'=>$course2->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $this->assertEquals($studentrole->id, $instance2->roleid);
        $instance3 = $DB->get_record('enrol', array('courseid'=>$course3->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $this->assertEquals($studentrole->id, $instance3->roleid);
        $id = $selfplugin->add_instance($course3, array('status'=>ENROL_INSTANCE_ENABLED, 'roleid'=>$teacherrole->id));
        $instance3b = $DB->get_record('enrol', array('id'=>$id), '*', MUST_EXIST);
        $this->assertEquals($teacherrole->id, $instance3b->roleid);
        unset($id);

        $maninstance2 = $DB->get_record('enrol', array('courseid'=>$course2->id, 'enrol'=>'manual'), '*', MUST_EXIST);
        $maninstance3 = $DB->get_record('enrol', array('courseid'=>$course3->id, 'enrol'=>'manual'), '*', MUST_EXIST);

        $manualplugin->enrol_user($maninstance2, $user1->id, $studentrole->id);
        $manualplugin->enrol_user($maninstance3, $user1->id, $teacherrole->id);

        $this->assertEquals(2, $DB->count_records('user_enrolments'));
        $this->assertEquals(2, $DB->count_records('role_assignments'));
        $this->assertEquals(1, $DB->count_records('role_assignments', array('roleid'=>$studentrole->id)));
        $this->assertEquals(1, $DB->count_records('role_assignments', array('roleid'=>$teacherrole->id)));

        $selfplugin->enrol_user($instance1, $user1->id, $studentrole->id);
        $selfplugin->enrol_user($instance1, $user2->id, $studentrole->id);
        $selfplugin->enrol_user($instance1, $user3->id, $studentrole->id, 0, $now-60);

        $selfplugin->enrol_user($instance3, $user1->id, $studentrole->id, 0, 0);
        $selfplugin->enrol_user($instance3, $user2->id, $studentrole->id, 0, $now-60*60);
        $selfplugin->enrol_user($instance3, $user3->id, $studentrole->id, 0, $now+60*60);
        $selfplugin->enrol_user($instance3b, $user1->id, $teacherrole->id, $now-60*60*24*7, $now-60);
        $selfplugin->enrol_user($instance3b, $user4->id, $teacherrole->id);

        role_assign($managerrole->id, $user3->id, $context1->id);

        $this->assertEquals(10, $DB->count_records('user_enrolments'));
        $this->assertEquals(10, $DB->count_records('role_assignments'));
        $this->assertEquals(7, $DB->count_records('role_assignments', array('roleid'=>$studentrole->id)));
        $this->assertEquals(2, $DB->count_records('role_assignments', array('roleid'=>$teacherrole->id)));

        // Execute tests.

        $this->assertEquals(ENROL_EXT_REMOVED_KEEP, $selfplugin->get_config('expiredaction'));
        $selfplugin->sync($trace, null);
        $this->assertEquals(10, $DB->count_records('user_enrolments'));
        $this->assertEquals(10, $DB->count_records('role_assignments'));


        $selfplugin->set_config('expiredaction', ENROL_EXT_REMOVED_SUSPENDNOROLES);
        $selfplugin->sync($trace, $course2->id);
        $this->assertEquals(10, $DB->count_records('user_enrolments'));
        $this->assertEquals(10, $DB->count_records('role_assignments'));

        $selfplugin->sync($trace, null);
        $this->assertEquals(10, $DB->count_records('user_enrolments'));
        $this->assertEquals(7, $DB->count_records('role_assignments'));
        $this->assertEquals(5, $DB->count_records('role_assignments', array('roleid'=>$studentrole->id)));
        $this->assertEquals(1, $DB->count_records('role_assignments', array('roleid'=>$teacherrole->id)));
        $this->assertFalse($DB->record_exists('role_assignments', array('contextid'=>$context1->id, 'userid'=>$user3->id, 'roleid'=>$studentrole->id)));
        $this->assertFalse($DB->record_exists('role_assignments', array('contextid'=>$context3->id, 'userid'=>$user2->id, 'roleid'=>$studentrole->id)));
        $this->assertFalse($DB->record_exists('role_assignments', array('contextid'=>$context3->id, 'userid'=>$user1->id, 'roleid'=>$teacherrole->id)));
        $this->assertTrue($DB->record_exists('role_assignments', array('contextid'=>$context3->id, 'userid'=>$user1->id, 'roleid'=>$studentrole->id)));


        $selfplugin->set_config('expiredaction', ENROL_EXT_REMOVED_UNENROL);

        role_assign($studentrole->id, $user3->id, $context1->id);
        role_assign($studentrole->id, $user2->id, $context3->id);
        role_assign($teacherrole->id, $user1->id, $context3->id);
        $this->assertEquals(10, $DB->count_records('user_enrolments'));
        $this->assertEquals(10, $DB->count_records('role_assignments'));
        $this->assertEquals(7, $DB->count_records('role_assignments', array('roleid'=>$studentrole->id)));
        $this->assertEquals(2, $DB->count_records('role_assignments', array('roleid'=>$teacherrole->id)));

        $selfplugin->sync($trace, null);
        $this->assertEquals(7, $DB->count_records('user_enrolments'));
        $this->assertFalse($DB->record_exists('user_enrolments', array('enrolid'=>$instance1->id, 'userid'=>$user3->id)));
        $this->assertFalse($DB->record_exists('user_enrolments', array('enrolid'=>$instance3->id, 'userid'=>$user2->id)));
        $this->assertFalse($DB->record_exists('user_enrolments', array('enrolid'=>$instance3b->id, 'userid'=>$user1->id)));
        $this->assertEquals(6, $DB->count_records('role_assignments'));
        $this->assertEquals(5, $DB->count_records('role_assignments', array('roleid'=>$studentrole->id)));
        $this->assertEquals(1, $DB->count_records('role_assignments', array('roleid'=>$teacherrole->id)));
    }

    public function test_send_expiry_notifications(): void {
        global $DB, $CFG;
        $this->resetAfterTest();
        $this->preventResetByRollback(); // Messaging does not like transactions...

        /** @var $selfplugin enrol_self_plugin */
        $selfplugin = enrol_get_plugin('self');
        /** @var $manualplugin enrol_manual_plugin */
        $manualplugin = enrol_get_plugin('manual');
        $now = time();
        $admin = get_admin();

        $trace = new \null_progress_trace();

        // Note: hopefully nobody executes the unit tests the last second before midnight...

        $selfplugin->set_config('expirynotifylast', $now - 60*60*24);
        $selfplugin->set_config('expirynotifyhour', 0);

        $studentrole = $DB->get_record('role', array('shortname'=>'student'));
        $this->assertNotEmpty($studentrole);
        $editingteacherrole = $DB->get_record('role', array('shortname'=>'editingteacher'));
        $this->assertNotEmpty($editingteacherrole);
        $managerrole = $DB->get_record('role', array('shortname'=>'manager'));
        $this->assertNotEmpty($managerrole);

        $user1 = $this->getDataGenerator()->create_user(array('lastname'=>'xuser1'));
        $user2 = $this->getDataGenerator()->create_user(array('lastname'=>'xuser2'));
        $user3 = $this->getDataGenerator()->create_user(array('lastname'=>'xuser3'));
        $user4 = $this->getDataGenerator()->create_user(array('lastname'=>'xuser4'));
        $user5 = $this->getDataGenerator()->create_user(array('lastname'=>'xuser5'));
        $user6 = $this->getDataGenerator()->create_user(array('lastname'=>'xuser6'));
        $user7 = $this->getDataGenerator()->create_user(array('lastname'=>'xuser6'));
        $user8 = $this->getDataGenerator()->create_user(array('lastname'=>'xuser6'));

        $course1 = $this->getDataGenerator()->create_course(array('fullname'=>'xcourse1'));
        $course2 = $this->getDataGenerator()->create_course(array('fullname'=>'xcourse2'));
        $course3 = $this->getDataGenerator()->create_course(array('fullname'=>'xcourse3'));
        $course4 = $this->getDataGenerator()->create_course(array('fullname'=>'xcourse4'));

        $this->assertEquals(4, $DB->count_records('enrol', array('enrol'=>'manual')));
        $this->assertEquals(4, $DB->count_records('enrol', array('enrol'=>'self')));

        $maninstance1 = $DB->get_record('enrol', array('courseid'=>$course1->id, 'enrol'=>'manual'), '*', MUST_EXIST);
        $instance1 = $DB->get_record('enrol', array('courseid'=>$course1->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance1->expirythreshold = 60*60*24*4;
        $instance1->expirynotify    = 1;
        $instance1->notifyall       = 1;
        $instance1->status          = ENROL_INSTANCE_ENABLED;
        $DB->update_record('enrol', $instance1);

        $maninstance2 = $DB->get_record('enrol', array('courseid'=>$course2->id, 'enrol'=>'manual'), '*', MUST_EXIST);
        $instance2 = $DB->get_record('enrol', array('courseid'=>$course2->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance2->expirythreshold = 60*60*24*1;
        $instance2->expirynotify    = 1;
        $instance2->notifyall       = 1;
        $instance2->status          = ENROL_INSTANCE_ENABLED;
        $DB->update_record('enrol', $instance2);

        $maninstance3 = $DB->get_record('enrol', array('courseid'=>$course3->id, 'enrol'=>'manual'), '*', MUST_EXIST);
        $instance3 = $DB->get_record('enrol', array('courseid'=>$course3->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance3->expirythreshold = 60*60*24*1;
        $instance3->expirynotify    = 1;
        $instance3->notifyall       = 0;
        $instance3->status          = ENROL_INSTANCE_ENABLED;
        $DB->update_record('enrol', $instance3);

        $maninstance4 = $DB->get_record('enrol', array('courseid'=>$course4->id, 'enrol'=>'manual'), '*', MUST_EXIST);
        $instance4 = $DB->get_record('enrol', array('courseid'=>$course4->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance4->expirythreshold = 60*60*24*1;
        $instance4->expirynotify    = 0;
        $instance4->notifyall       = 0;
        $instance4->status          = ENROL_INSTANCE_ENABLED;
        $DB->update_record('enrol', $instance4);

        $selfplugin->enrol_user($instance1, $user1->id, $studentrole->id, 0, $now + 60*60*24*1, ENROL_USER_SUSPENDED); // Suspended users are not notified.
        $selfplugin->enrol_user($instance1, $user2->id, $studentrole->id, 0, $now + 60*60*24*5);                       // Above threshold are not notified.
        $selfplugin->enrol_user($instance1, $user3->id, $studentrole->id, 0, $now + 60*60*24*3 + 60*60);               // Less than one day after threshold - should be notified.
        $selfplugin->enrol_user($instance1, $user4->id, $studentrole->id, 0, $now + 60*60*24*4 - 60*3);                // Less than one day after threshold - should be notified.
        $selfplugin->enrol_user($instance1, $user5->id, $studentrole->id, 0, $now + 60*60);                            // Should have been already notified.
        $selfplugin->enrol_user($instance1, $user6->id, $studentrole->id, 0, $now - 60);                               // Already expired.
        $manualplugin->enrol_user($maninstance1, $user7->id, $editingteacherrole->id);
        $manualplugin->enrol_user($maninstance1, $user8->id, $managerrole->id);                                        // Highest role --> enroller.

        $selfplugin->enrol_user($instance2, $user1->id, $studentrole->id);
        $selfplugin->enrol_user($instance2, $user2->id, $studentrole->id, 0, $now + 60*60*24*1 + 60*3);                // Above threshold are not notified.
        $selfplugin->enrol_user($instance2, $user3->id, $studentrole->id, 0, $now + 60*60*24*1 - 60*60);               // Less than one day after threshold - should be notified.

        $manualplugin->enrol_user($maninstance3, $user1->id, $editingteacherrole->id);
        $selfplugin->enrol_user($instance3, $user2->id, $studentrole->id, 0, $now + 60*60*24*1 + 60);                  // Above threshold are not notified.
        $selfplugin->enrol_user($instance3, $user3->id, $studentrole->id, 0, $now + 60*60*24*1 - 60*60);               // Less than one day after threshold - should be notified.

        $manualplugin->enrol_user($maninstance4, $user4->id, $editingteacherrole->id);
        $selfplugin->enrol_user($instance4, $user5->id, $studentrole->id, 0, $now + 60*60*24*1 + 60);
        $selfplugin->enrol_user($instance4, $user6->id, $studentrole->id, 0, $now + 60*60*24*1 - 60*60);

        // The notification is sent out in fixed order first individual users,
        // then summary per course by enrolid, user lastname, etc.
        $this->assertGreaterThan($instance1->id, $instance2->id);
        $this->assertGreaterThan($instance2->id, $instance3->id);

        $sink = $this->redirectMessages();

        $selfplugin->send_expiry_notifications($trace);

        $messages = $sink->get_messages();

        $this->assertEquals(2+1 + 1+1 + 1 + 0, count($messages));

        // First individual notifications from course1.
        $this->assertEquals($user3->id, $messages[0]->useridto);
        $this->assertEquals($user8->id, $messages[0]->useridfrom);
        $this->assertStringContainsString('xcourse1', $messages[0]->fullmessagehtml);

        $this->assertEquals($user4->id, $messages[1]->useridto);
        $this->assertEquals($user8->id, $messages[1]->useridfrom);
        $this->assertStringContainsString('xcourse1', $messages[1]->fullmessagehtml);

        // Then summary for course1.
        $this->assertEquals($user8->id, $messages[2]->useridto);
        $this->assertEquals($admin->id, $messages[2]->useridfrom);
        $this->assertStringContainsString('xcourse1', $messages[2]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser1', $messages[2]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser2', $messages[2]->fullmessagehtml);
        $this->assertStringContainsString('xuser3', $messages[2]->fullmessagehtml);
        $this->assertStringContainsString('xuser4', $messages[2]->fullmessagehtml);
        $this->assertStringContainsString('xuser5', $messages[2]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser6', $messages[2]->fullmessagehtml);

        // First individual notifications from course2.
        $this->assertEquals($user3->id, $messages[3]->useridto);
        $this->assertEquals($admin->id, $messages[3]->useridfrom);
        $this->assertStringContainsString('xcourse2', $messages[3]->fullmessagehtml);

        // Then summary for course2.
        $this->assertEquals($admin->id, $messages[4]->useridto);
        $this->assertEquals($admin->id, $messages[4]->useridfrom);
        $this->assertStringContainsString('xcourse2', $messages[4]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser1', $messages[4]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser2', $messages[4]->fullmessagehtml);
        $this->assertStringContainsString('xuser3', $messages[4]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser4', $messages[4]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser5', $messages[4]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser6', $messages[4]->fullmessagehtml);

        // Only summary in course3.
        $this->assertEquals($user1->id, $messages[5]->useridto);
        $this->assertEquals($admin->id, $messages[5]->useridfrom);
        $this->assertStringContainsString('xcourse3', $messages[5]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser1', $messages[5]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser2', $messages[5]->fullmessagehtml);
        $this->assertStringContainsString('xuser3', $messages[5]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser4', $messages[5]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser5', $messages[5]->fullmessagehtml);
        $this->assertStringNotContainsString('xuser6', $messages[5]->fullmessagehtml);


        // Make sure that notifications are not repeated.
        $sink->clear();

        $selfplugin->send_expiry_notifications($trace);
        $this->assertEquals(0, $sink->count());

        // use invalid notification hour to verify that before the hour the notifications are not sent.
        $selfplugin->set_config('expirynotifylast', time() - 60*60*24);
        $selfplugin->set_config('expirynotifyhour', '24');

        $selfplugin->send_expiry_notifications($trace);
        $this->assertEquals(0, $sink->count());

        $selfplugin->set_config('expirynotifyhour', '0');
        $selfplugin->send_expiry_notifications($trace);
        $this->assertEquals(6, $sink->count());
    }

    public function test_show_enrolme_link(): void {
        global $DB, $CFG;
        $this->resetAfterTest();
        $this->preventResetByRollback(); // Messaging does not like transactions...

        /** @var $selfplugin enrol_self_plugin */
        $selfplugin = enrol_get_plugin('self');

        $user1 = $this->getDataGenerator()->create_user();
        $user2 = $this->getDataGenerator()->create_user();

        $studentrole = $DB->get_record('role', array('shortname'=>'student'));
        $this->assertNotEmpty($studentrole);

        $course1 = $this->getDataGenerator()->create_course();
        $course2 = $this->getDataGenerator()->create_course();
        $course3 = $this->getDataGenerator()->create_course();
        $course4 = $this->getDataGenerator()->create_course();
        $course5 = $this->getDataGenerator()->create_course();
        $course6 = $this->getDataGenerator()->create_course();
        $course7 = $this->getDataGenerator()->create_course();
        $course8 = $this->getDataGenerator()->create_course();
        $course9 = $this->getDataGenerator()->create_course();
        $course10 = $this->getDataGenerator()->create_course();
        $course11 = $this->getDataGenerator()->create_course();

        $cohort1 = $this->getDataGenerator()->create_cohort();
        $cohort2 = $this->getDataGenerator()->create_cohort();

        // New enrolments are allowed and enrolment instance is enabled.
        $instance1 = $DB->get_record('enrol', array('courseid'=>$course1->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance1->customint6 = 1;
        $DB->update_record('enrol', $instance1);
        $selfplugin->update_status($instance1, ENROL_INSTANCE_ENABLED);

        // New enrolments are not allowed, but enrolment instance is enabled.
        $instance2 = $DB->get_record('enrol', array('courseid'=>$course2->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance2->customint6 = 0;
        $DB->update_record('enrol', $instance2);
        $selfplugin->update_status($instance2, ENROL_INSTANCE_ENABLED);

        // New enrolments are allowed , but enrolment instance is disabled.
        $instance3 = $DB->get_record('enrol', array('courseid'=>$course3->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance3->customint6 = 1;
        $DB->update_record('enrol', $instance3);
        $selfplugin->update_status($instance3, ENROL_INSTANCE_DISABLED);

        // New enrolments are not allowed and enrolment instance is disabled.
        $instance4 = $DB->get_record('enrol', array('courseid'=>$course4->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance4->customint6 = 0;
        $DB->update_record('enrol', $instance4);
        $selfplugin->update_status($instance4, ENROL_INSTANCE_DISABLED);

        // Cohort member test.
        $instance5 = $DB->get_record('enrol', array('courseid'=>$course5->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance5->customint6 = 1;
        $instance5->customint5 = $cohort1->id;
        $DB->update_record('enrol', $instance1);
        $selfplugin->update_status($instance5, ENROL_INSTANCE_ENABLED);

        $id = $selfplugin->add_instance($course5, $selfplugin->get_instance_defaults());
        $instance6 = $DB->get_record('enrol', array('id'=>$id), '*', MUST_EXIST);
        $instance6->customint6 = 1;
        $instance6->customint5 = $cohort2->id;
        $DB->update_record('enrol', $instance1);
        $selfplugin->update_status($instance6, ENROL_INSTANCE_ENABLED);

        // Enrol start date is in future.
        $instance7 = $DB->get_record('enrol', array('courseid'=>$course6->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance7->customint6 = 1;
        $instance7->enrolstartdate = time() + 60;
        $DB->update_record('enrol', $instance7);
        $selfplugin->update_status($instance7, ENROL_INSTANCE_ENABLED);

        // Enrol start date is in past.
        $instance8 = $DB->get_record('enrol', array('courseid'=>$course7->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance8->customint6 = 1;
        $instance8->enrolstartdate = time() - 60;
        $DB->update_record('enrol', $instance8);
        $selfplugin->update_status($instance8, ENROL_INSTANCE_ENABLED);

        // Enrol end date is in future.
        $instance9 = $DB->get_record('enrol', array('courseid'=>$course8->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance9->customint6 = 1;
        $instance9->enrolenddate = time() + 60;
        $DB->update_record('enrol', $instance9);
        $selfplugin->update_status($instance9, ENROL_INSTANCE_ENABLED);

        // Enrol end date is in past.
        $instance10 = $DB->get_record('enrol', array('courseid'=>$course9->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance10->customint6 = 1;
        $instance10->enrolenddate = time() - 60;
        $DB->update_record('enrol', $instance10);
        $selfplugin->update_status($instance10, ENROL_INSTANCE_ENABLED);

        // Maximum enrolments reached.
        $instance11 = $DB->get_record('enrol', array('courseid'=>$course10->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance11->customint6 = 1;
        $instance11->customint3 = 1;
        $DB->update_record('enrol', $instance11);
        $selfplugin->update_status($instance11, ENROL_INSTANCE_ENABLED);
        $selfplugin->enrol_user($instance11, $user2->id, $studentrole->id);

        // Maximum enrolments not reached.
        $instance12 = $DB->get_record('enrol', array('courseid'=>$course11->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance12->customint6 = 1;
        $instance12->customint3 = 1;
        $DB->update_record('enrol', $instance12);
        $selfplugin->update_status($instance12, ENROL_INSTANCE_ENABLED);

        $this->setUser($user1);
        $this->assertTrue($selfplugin->show_enrolme_link($instance1));
        $this->assertFalse($selfplugin->show_enrolme_link($instance2));
        $this->assertFalse($selfplugin->show_enrolme_link($instance3));
        $this->assertFalse($selfplugin->show_enrolme_link($instance4));
        $this->assertFalse($selfplugin->show_enrolme_link($instance7));
        $this->assertTrue($selfplugin->show_enrolme_link($instance8));
        $this->assertTrue($selfplugin->show_enrolme_link($instance9));
        $this->assertFalse($selfplugin->show_enrolme_link($instance10));
        $this->assertFalse($selfplugin->show_enrolme_link($instance11));
        $this->assertTrue($selfplugin->show_enrolme_link($instance12));

        require_once("$CFG->dirroot/cohort/lib.php");
        cohort_add_member($cohort1->id, $user1->id);

        $this->assertTrue($selfplugin->show_enrolme_link($instance5));
        $this->assertFalse($selfplugin->show_enrolme_link($instance6));
    }

    /**
     * This will check user enrolment only, rest has been tested in test_show_enrolme_link.
     */
    public function test_can_self_enrol(): void {
        global $DB, $CFG, $OUTPUT;
        $this->resetAfterTest();
        $this->preventResetByRollback();

        $selfplugin = enrol_get_plugin('self');

        $expectederrorstring = get_string('canntenrol', 'enrol_self');

        $user1 = $this->getDataGenerator()->create_user();
        $user2 = $this->getDataGenerator()->create_user();
        $guest = $DB->get_record('user', array('id' => $CFG->siteguest));

        $studentrole = $DB->get_record('role', array('shortname'=>'student'));
        $this->assertNotEmpty($studentrole);
        $editingteacherrole = $DB->get_record('role', array('shortname'=>'editingteacher'));
        $this->assertNotEmpty($editingteacherrole);

        $course1 = $this->getDataGenerator()->create_course();

        $instance1 = $DB->get_record('enrol', array('courseid'=>$course1->id, 'enrol'=>'self'), '*', MUST_EXIST);
        $instance1->customint6 = 1;
        $DB->update_record('enrol', $instance1);
        $selfplugin->update_status($instance1, ENROL_INSTANCE_ENABLED);
        $selfplugin->enrol_user($instance1, $user2->id, $editingteacherrole->id);

        $this->setUser($guest);
        $this->assertStringContainsString(get_string('noguestaccess', 'enrol'),
                $selfplugin->can_self_enrol($instance1, true));

        $this->setUser($user1);
        $this->assertTrue($selfplugin->can_self_enrol($instance1, true));

        // Active enroled user.
        $this->setUser($user2);
        $selfplugin->enrol_user($instance1, $user1->id, $studentrole->id);
        $this->setUser($user1);
        $this->assertSame($expectederrorstring, $selfplugin->can_self_enrol($instance1, true));
    }

    /**
     * Test is_self_enrol_available function behavior.
     *
     * @covers ::is_self_enrol_available
     */
    public function test_is_self_enrol_available(): void {
        global $DB, $CFG;

        $this->resetAfterTest();
        $this->preventResetByRollback(); // Messaging does not like transactions...

        $selfplugin = enrol_get_plugin('self');

        $user1 = $this->getDataGenerator()->create_user();
        $user2 = $this->getDataGenerator()->create_user();

        $studentrole = $DB->get_record('role', ['shortname' => 'student'], '*', MUST_EXIST);
        $course = $this->getDataGenerator()->create_course();
        $cohort1 = $this->getDataGenerator()->create_cohort();
        $cohort2 = $this->getDataGenerator()->create_cohort();

        // New enrolments are allowed and enrolment instance is enabled.
        $instance = $DB->get_record('enrol', ['courseid' => $course->id, 'enrol' => 'self'], '*', MUST_EXIST);
        $instance->customint6 = 1;
        $DB->update_record('enrol', $instance);
        $selfplugin->update_status($instance, ENROL_INSTANCE_ENABLED);
        $this->setUser($user1);
        $this->assertTrue($selfplugin->is_self_enrol_available($instance));
        $this->setGuestUser();
        $this->assertTrue($selfplugin->is_self_enrol_available($instance));

        $canntenrolerror = get_string('canntenrol', 'enrol_self');

        // New enrolments are not allowed, but enrolment instance is enabled.
        $instance->customint6 = 0;
        $DB->update_record('enrol', $instance);
        $this->setUser($user1);
        $this->assertEquals($canntenrolerror, $selfplugin->is_self_enrol_available($instance));
        $this->setGuestUser();
        $this->assertEquals($canntenrolerror, $selfplugin->is_self_enrol_available($instance));

        // New enrolments are allowed, but enrolment instance is disabled.
        $instance->customint6 = 1;
        $DB->update_record('enrol', $instance);
        $selfplugin->update_status($instance, ENROL_INSTANCE_DISABLED);
        $this->setUser($user1);
        $this->assertEquals($canntenrolerror, $selfplugin->is_self_enrol_available($instance));
        $this->setGuestUser();
        $this->assertEquals($canntenrolerror, $selfplugin->is_self_enrol_available($instance));

        // New enrolments are not allowed and enrolment instance is disabled.
        $instance->customint6 = 0;
        $DB->update_record('enrol', $instance);
        $this->setUser($user1);
        $this->assertEquals($canntenrolerror, $selfplugin->is_self_enrol_available($instance));
        $this->setGuestUser();
        $this->assertEquals($canntenrolerror, $selfplugin->is_self_enrol_available($instance));

        // Enable enrolment instance for the rest of the tests.
        $selfplugin->update_status($instance, ENROL_INSTANCE_ENABLED);

        // Enrol start date is in future.
        $instance->customint6 = 1;
        $instance->enrolstartdate = time() + 60;
        $DB->update_record('enrol', $instance);
        $error = get_string('canntenrolearly', 'enrol_self', userdate($instance->enrolstartdate));
        $this->setUser($user1);
        $this->assertEquals($error, $selfplugin->is_self_enrol_available($instance));
        $this->setGuestUser();
        $this->assertEquals($error, $selfplugin->is_self_enrol_available($instance));

        // Enrol start date is in past.
        $instance->enrolstartdate = time() - 60;
        $DB->update_record('enrol', $instance);
        $this->setUser($user1);
        $this->assertTrue($selfplugin->is_self_enrol_available($instance));
        $this->setGuestUser();
        $this->assertTrue($selfplugin->is_self_enrol_available($instance));

        // Enrol end date is in future.
        $instance->enrolstartdate = 0;
        $instance->enrolenddate = time() + 60;
        $DB->update_record('enrol', $instance);
        $this->setUser($user1);
        $this->assertTrue($selfplugin->is_self_enrol_available($instance));
        $this->setGuestUser();
        $this->assertTrue($selfplugin->is_self_enrol_available($instance));

        // Enrol end date is in past.
        $instance->enrolenddate = time() - 60;
        $DB->update_record('enrol', $instance);
        $error = get_string('canntenrollate', 'enrol_self', userdate($instance->enrolenddate));
        $this->setUser($user1);
        $this->assertEquals($error, $selfplugin->is_self_enrol_available($instance));
        $this->setGuestUser();
        $this->assertEquals($error, $selfplugin->is_self_enrol_available($instance));

        // Maximum enrolments reached.
        $instance->customint3 = 1;
        $instance->enrolenddate = 0;
        $DB->update_record('enrol', $instance);
        $selfplugin->enrol_user($instance, $user2->id, $studentrole->id);
        $error = get_string('maxenrolledreached', 'enrol_self');
        $this->setUser($user1);
        $this->assertEquals($error, $selfplugin->is_self_enrol_available($instance));
        $this->setGuestUser();
        $this->assertEquals($error, $selfplugin->is_self_enrol_available($instance));

        // Maximum enrolments not reached.
        $instance->customint3 = 3;
        $DB->update_record('enrol', $instance);
        $this->setUser($user1);
        $this->assertTrue($selfplugin->is_self_enrol_available($instance));
        $this->setGuestUser();
        $this->assertTrue($selfplugin->is_self_enrol_available($instance));

        require_once("$CFG->dirroot/cohort/lib.php");
        cohort_add_member($cohort1->id, $user2->id);

        // Cohort test.
        $instance->customint5 = $cohort1->id;
        $DB->update_record('enrol', $instance);
        $error = get_string('cohortnonmemberinfo', 'enrol_self', $cohort1->name);
        $this->setUser($user1);
        $this->assertStringContainsString($error, $selfplugin->is_self_enrol_available($instance));
        $this->setGuestUser();
        $this->assertStringContainsString($error, $selfplugin->is_self_enrol_available($instance));
        $this->setUser($user2);
        $this->assertEquals($canntenrolerror, $selfplugin->is_self_enrol_available($instance));
    }

    /**
     * Test custom validation of instance data for group enrolment key
     *
     * @covers ::edit_instance_validation
     */
    public function test_edit_instance_validation_group_enrolment_key(): void {
        global $DB;

        $this->resetAfterTest();

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

        /** @var enrol_self_plugin $plugin */
        $plugin = enrol_get_plugin('self');

        $instance = $DB->get_record('enrol', ['courseid' => $course->id, 'enrol' => $plugin->get_name()], '*', MUST_EXIST);

        // Enable group enrolment keys.
        $errors = $plugin->edit_instance_validation([
            'customint1' => 1,
            'password' => 'cat',
        ] + (array) $instance, [], $instance, $context);

        $this->assertEmpty($errors);

        // Now create a group with the same enrolment key we want to use.
        $this->getDataGenerator()->create_group(['courseid' => $course->id, 'enrolmentkey' => 'cat']);

        $errors = $plugin->edit_instance_validation([
            'customint1' => 1,
            'password' => 'cat',
        ] + (array) $instance, [], $instance, $context);

        $this->assertArrayHasKey('password', $errors);
        $this->assertEquals('This enrolment key is already used as a group enrolment key.', $errors['password']);
    }

    /**
     * Test enrol_self_check_group_enrolment_key
     */
    public function test_enrol_self_check_group_enrolment_key(): void {
        global $DB;
        self::resetAfterTest(true);

        // Test in course with groups.
        $course = self::getDataGenerator()->create_course(array('groupmode' => SEPARATEGROUPS, 'groupmodeforce' => 1));

        $group1 = $this->getDataGenerator()->create_group(array('courseid' => $course->id));
        $group2 = $this->getDataGenerator()->create_group(array('courseid' => $course->id, 'enrolmentkey' => 'thepassword'));

        $result = enrol_self_check_group_enrolment_key($course->id, 'invalidpassword');
        $this->assertFalse($result);

        $result = enrol_self_check_group_enrolment_key($course->id, 'thepassword');
        $this->assertTrue($result);

        // Test disabling group options.
        $course->groupmode = NOGROUPS;
        $course->groupmodeforce = 0;
        $DB->update_record('course', $course);

        $result = enrol_self_check_group_enrolment_key($course->id, 'invalidpassword');
        $this->assertFalse($result);

        $result = enrol_self_check_group_enrolment_key($course->id, 'thepassword');
        $this->assertTrue($result);

        // Test without groups.
        $othercourse = self::getDataGenerator()->create_course();
        $result = enrol_self_check_group_enrolment_key($othercourse->id, 'thepassword');
        $this->assertFalse($result);

    }

    /**
     * Test getting welcome message contact
     *
     * @covers \enrol_plugin::get_welcome_message_contact
     */
    public function test_get_welcome_message_contact(): void {
        global $DB;
        self::resetAfterTest(true);

        $user1 = $this->getDataGenerator()->create_user(['lastname' => 'Marsh']);
        $user2 = $this->getDataGenerator()->create_user(['lastname' => 'Victoria']);
        $user3 = $this->getDataGenerator()->create_user(['lastname' => 'Burch']);
        $user4 = $this->getDataGenerator()->create_user(['lastname' => 'Cartman']);
        $noreplyuser = \core_user::get_noreply_user();

        $course1 = $this->getDataGenerator()->create_course();
        $context = \context_course::instance($course1->id);

        // Get editing teacher role.
        $editingteacherrole = $DB->get_record('role', ['shortname' => 'editingteacher']);
        $this->assertNotEmpty($editingteacherrole);

        // Enable self enrolment plugin and set to send email from course contact.
        $selfplugin = enrol_get_plugin('self');
        $instance1 = $DB->get_record('enrol', ['courseid' => $course1->id, 'enrol' => 'self'], '*', MUST_EXIST);
        $instance1->customint6 = 1;
        $instance1->customint4 = ENROL_SEND_EMAIL_FROM_COURSE_CONTACT;
        $DB->update_record('enrol', $instance1);
        $selfplugin->update_status($instance1, ENROL_INSTANCE_ENABLED);

        // This should return null.
        $contact = $selfplugin->get_welcome_message_contact(ENROL_DO_NOT_SEND_EMAIL, $context);
        $this->assertNull($contact);

        // We do not have a teacher enrolled at this point, so it should return null.
        $contact = $selfplugin->get_welcome_message_contact(ENROL_SEND_EMAIL_FROM_COURSE_CONTACT, $context);
        $this->assertNull($contact);

        // By default, course contact is assigned to teacher role.
        // Enrol a teacher, now it should send emails from teacher email's address.
        $selfplugin->enrol_user($instance1, $user1->id, $editingteacherrole->id);

        // We should get the teacher email.
        $contact = $selfplugin->get_welcome_message_contact(ENROL_SEND_EMAIL_FROM_COURSE_CONTACT, $context);
        $this->assertEquals($user1->username, $contact->username);
        $this->assertEquals($user1->email, $contact->email);

        // Now let's enrol another teacher.
        $selfplugin->enrol_user($instance1, $user2->id, $editingteacherrole->id);
        $contact = $selfplugin->get_welcome_message_contact(ENROL_SEND_EMAIL_FROM_COURSE_CONTACT, $context);
        $this->assertEquals($user1->username, $contact->username);
        $this->assertEquals($user1->email, $contact->email);

        // Get manager role, and enrol user as manager.
        $managerrole = $DB->get_record('role', ['shortname' => 'manager']);
        $this->assertNotEmpty($managerrole);
        $instance1->customint4 = ENROL_SEND_EMAIL_FROM_KEY_HOLDER;
        $DB->update_record('enrol', $instance1);
        $selfplugin->enrol_user($instance1, $user3->id, $managerrole->id);

        // Give manager role holdkey capability.
        assign_capability('enrol/self:holdkey', CAP_ALLOW, $managerrole->id, $context);

        // We should get the manager email contact.
        $contact = $selfplugin->get_welcome_message_contact(ENROL_SEND_EMAIL_FROM_KEY_HOLDER, $context);
        $this->assertEquals($user3->username, $contact->username);
        $this->assertEquals($user3->email, $contact->email);

        // Now let's enrol another manager.
        $selfplugin->enrol_user($instance1, $user4->id, $managerrole->id);
        $contact = $selfplugin->get_welcome_message_contact(ENROL_SEND_EMAIL_FROM_KEY_HOLDER, $context);
        $this->assertEquals($user3->username, $contact->username);
        $this->assertEquals($user3->email, $contact->email);

        $instance1->customint4 = ENROL_SEND_EMAIL_FROM_NOREPLY;
        $DB->update_record('enrol', $instance1);

        $contact = $selfplugin->get_welcome_message_contact(ENROL_SEND_EMAIL_FROM_NOREPLY, $context);
        $this->assertEquals($noreplyuser, $contact);

        $this->expectException(\moodle_exception::class);
        $this->expectExceptionMessage('Invalid send option');
        $contact = $selfplugin->get_welcome_message_contact(10, $context);
    }

    /**
     * Test for getting user enrolment actions.
     */
    public function test_get_user_enrolment_actions(): void {
        global $CFG, $DB, $PAGE;
        $this->resetAfterTest();

        // Set page URL to prevent debugging messages.
        $PAGE->set_url('/enrol/editinstance.php');

        $pluginname = 'self';

        // Only enable the self enrol plugin.
        $CFG->enrol_plugins_enabled = $pluginname;

        $generator = $this->getDataGenerator();

        // Get the enrol plugin.
        $plugin = enrol_get_plugin($pluginname);

        // Create a course.
        $course = $generator->create_course();

        // Create a teacher.
        $teacher = $generator->create_user();
        // Enrol the teacher to the course.
        $enrolresult = $generator->enrol_user($teacher->id, $course->id, 'editingteacher', $pluginname);
        $this->assertTrue($enrolresult);
        // Create a student.
        $student = $generator->create_user();
        // Enrol the student to the course.
        $enrolresult = $generator->enrol_user($student->id, $course->id, 'student', $pluginname);
        $this->assertTrue($enrolresult);

        // Login as the teacher.
        $this->setUser($teacher);
        require_once($CFG->dirroot . '/enrol/locallib.php');
        $manager = new \course_enrolment_manager($PAGE, $course);
        $userenrolments = $manager->get_user_enrolments($student->id);
        $this->assertCount(1, $userenrolments);

        $ue = reset($userenrolments);
        $actions = $plugin->get_user_enrolment_actions($manager, $ue);
        // Self enrol has 2 enrol actions -- edit and unenrol.
        $this->assertCount(2, $actions);
    }

    /**
     * Test the behaviour of find_instance().
     *
     * @covers ::find_instance
     */
    public function test_find_instance(): void {
        global $DB;
        $this->resetAfterTest();

        $cat = $this->getDataGenerator()->create_category();
        // When we create a course, a self enrolment instance is also created.
        $course = $this->getDataGenerator()->create_course(['category' => $cat->id, 'shortname' => 'ANON']);

        $teacherrole = $DB->get_record('role', ['shortname' => 'teacher']);
        $selfplugin = enrol_get_plugin('self');

        $instanceid1 = $DB->get_record('enrol', ['courseid' => $course->id, 'enrol' => 'self']);

        // Let's add a second instance.
        $instanceid2 = $selfplugin->add_instance($course, ['roleid' => $teacherrole->id]);

        $enrolmentdata = [];
        // The first instance should be returned - due to sorting in enrol_get_instances().
        $actual = $selfplugin->find_instance($enrolmentdata, $course->id);
        $this->assertEquals($instanceid1->id, $actual->id);
    }

    /**
     * Test the behaviour of validate_enrol_plugin_data().
     *
     * @covers ::validate_enrol_plugin_data
     */
    public function test_validate_enrol_plugin_data(): void {
        global $CFG;

        $this->resetAfterTest();

        // Test in course with groups.
        $course = self::getDataGenerator()->create_course(['groupmode' => SEPARATEGROUPS, 'groupmodeforce' => 1]);

        $selfplugin = enrol_get_plugin('self');

        $selfplugin->set_config('usepasswordpolicy', false);
        $enrolmentdata = [];
        $errors = $selfplugin->validate_enrol_plugin_data($enrolmentdata);
        $this->assertEmpty($errors);

        // Now enable some controls, and check that the policy responds with policy text.
        $selfplugin->set_config('usepasswordpolicy', true);
        $CFG->minpasswordlength = 8;
        $CFG->minpassworddigits = 1;
        $CFG->minpasswordlower = 1;
        $CFG->minpasswordupper = 1;
        $CFG->minpasswordnonalphanum = 1;
        $CFG->maxconsecutiveidentchars = 1;
        $errors = $selfplugin->validate_enrol_plugin_data($enrolmentdata);
        // If password is omitted it will be autocreated so nothing to validate.
        $this->assertEmpty($errors);

        $enrolmentdata = ['password' => 'test'];
        $errors = $selfplugin->validate_enrol_plugin_data($enrolmentdata);
        $this->assertCount(4, $errors);
        $this->assertEquals(get_string('errorminpasswordlength', 'auth', $CFG->minpasswordlength), $errors['enrol_self0']);
        $this->assertEquals(get_string('errorminpassworddigits', 'auth', $CFG->minpassworddigits), $errors['enrol_self1']);
        $this->assertEquals(get_string('errorminpasswordupper', 'auth', $CFG->minpasswordupper), $errors['enrol_self2']);
        $this->assertEquals(get_string('errorminpasswordnonalphanum', 'auth', $CFG->minpasswordnonalphanum), $errors['enrol_self3']);

        $enrolmentdata = ['password' => 'Testingtest123@'];
        $errors = $selfplugin->validate_enrol_plugin_data($enrolmentdata);
        $this->assertEmpty($errors);

        $this->getDataGenerator()->create_group(['courseid' => $course->id, 'enrolmentkey' => 'Abirvalg123@']);
        $instance = $selfplugin->find_instance([], $course->id);
        $instance->customint1 = 1;
        $selfplugin->update_instance($instance, $instance);
        $enrolmentdata = ['password' => 'Abirvalg123@'];
        $errors = $selfplugin->validate_enrol_plugin_data($enrolmentdata, $course->id);
        $this->assertArrayHasKey('errorpasswordmatchesgroupkey', $errors);
    }

    /**
     * Test the behaviour of update_enrol_plugin_data().
     *
     * @covers ::update_enrol_plugin_data
     */
    public function test_update_enrol_plugin_data(): void {
        global $DB;
        $this->resetAfterTest();
        $manualplugin = enrol_get_plugin('self');

        $admin = get_admin();
        $this->setUser($admin);

        $enrolmentdata = [];

        $cat = $this->getDataGenerator()->create_category();
        $course = $this->getDataGenerator()->create_course(['category' => $cat->id, 'shortname' => 'ANON']);
        $instance = $DB->get_record('enrol', ['courseid' => $course->id, 'enrol' => 'self'], '*', MUST_EXIST);

        $expectedinstance = $instance;
        $modifiedinstance = $manualplugin->update_enrol_plugin_data($course->id, $enrolmentdata, $instance);
        $this->assertEquals($expectedinstance, $modifiedinstance);

        $enrolmentdata['password'] = 'test';
        $expectedinstance->password = 'test';
        $modifiedinstance = $manualplugin->update_enrol_plugin_data($course->id, $enrolmentdata, $instance);
        $this->assertEquals($expectedinstance, $modifiedinstance);
    }

}
