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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

namespace core;

use core_group\visibility;

/**
 * Unit tests for lib/grouplib.php
 *
 * @package    core
 * @copyright  2007 onwards Martin Dougiamas (http://dougiamas.com)
 * @author     Andrew Nicols
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
final class grouplib_test extends \advanced_testcase {

    public function test_groups_get_group_by_idnumber(): void {
        $this->resetAfterTest(true);

        $generator = $this->getDataGenerator();

        // Create a course category and course.
        $cat = $generator->create_category(array('parent' => 0));
        $course = $generator->create_course(array('category' => $cat->id));

        $idnumber1 = 'idnumber1';
        $idnumber2 = 'idnumber2';

        /*
         * Test with an empty and a null idnumber.
         */
        // An empty idnumber should always return a false value.
        $this->assertFalse(groups_get_group_by_idnumber($course->id, ''));
        $this->assertFalse(groups_get_group_by_idnumber($course->id, null));

        // Even when a group exists which also has an empty idnumber.
        $generator->create_group(array('courseid' => $course->id));
        $this->assertFalse(groups_get_group_by_idnumber($course->id, ''));
        $this->assertFalse(groups_get_group_by_idnumber($course->id, null));

        /*
         * Test with a valid idnumber.
         */
        // There is no matching idnumber at present.
        $this->assertFalse(groups_get_group_by_idnumber($course->id, $idnumber1));

        // We should now have a valid group returned by the idnumber search.
        $group = $generator->create_group(array('courseid' => $course->id, 'idnumber' => $idnumber1));
        $this->assertEquals($group, groups_get_group_by_idnumber($course->id, $idnumber1));

        // An empty idnumber should still return false.
        $this->assertFalse(groups_get_group_by_idnumber($course->id, ''));
        $this->assertFalse(groups_get_group_by_idnumber($course->id, null));

        /*
         * Test with another idnumber.
         */
        // There is no matching idnumber at present.
        $this->assertFalse(groups_get_group_by_idnumber($course->id, $idnumber2));

        // We should now have a valid group returned by the idnumber search.
        $group = $generator->create_group(array('courseid' => $course->id, 'idnumber' => $idnumber2));
        $this->assertEquals($group, groups_get_group_by_idnumber($course->id, $idnumber2));

        /*
         * Group idnumbers are unique within a course so test that we don't
         * retrieve groups for the first course.
         */

        // Create a second course.
        $course = $generator->create_course(array('category' => $cat->id));

        // An empty idnumber should always return a false value.
        $this->assertFalse(groups_get_group_by_idnumber($course->id, ''));
        $this->assertFalse(groups_get_group_by_idnumber($course->id, null));

        // Our existing idnumbers shouldn't be returned here as we're in a different course.
        $this->assertFalse(groups_get_group_by_idnumber($course->id, $idnumber1));
        $this->assertFalse(groups_get_group_by_idnumber($course->id, $idnumber2));

        // We should be able to reuse the idnumbers again since this is a different course.
        $group = $generator->create_group(array('courseid' => $course->id, 'idnumber' => $idnumber1));
        $this->assertEquals($group, groups_get_group_by_idnumber($course->id, $idnumber1));

        $group = $generator->create_group(array('courseid' => $course->id, 'idnumber' => $idnumber2));
        $this->assertEquals($group, groups_get_group_by_idnumber($course->id, $idnumber2));
    }

    public function test_groups_get_grouping_by_idnumber(): void {
        $this->resetAfterTest(true);

        $generator = $this->getDataGenerator();

        // Create a course category and course.
        $cat = $generator->create_category(array('parent' => 0));
        $course = $generator->create_course(array('category' => $cat->id));

        $idnumber1 = 'idnumber1';
        $idnumber2 = 'idnumber2';

        /*
         * Test with an empty and a null idnumber.
         */
        // An empty idnumber should always return a false value.
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, ''));
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, null));

        // Even when a grouping exists which also has an empty idnumber.
        $generator->create_grouping(array('courseid' => $course->id));
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, ''));
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, null));

        /*
         * Test with a valid idnumber
         */
        // There is no matching idnumber at present.
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, $idnumber1));

        // We should now have a valid group returned by the idnumber search.
        $grouping = $generator->create_grouping(array('courseid' => $course->id, 'idnumber' => $idnumber1));
        $this->assertEquals($grouping, groups_get_grouping_by_idnumber($course->id, $idnumber1));

        // An empty idnumber should still return false.
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, ''));
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, null));

        /*
         * Test with another idnumber.
         */
        // There is no matching idnumber at present.
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, $idnumber2));

        // We should now have a valid grouping returned by the idnumber search.
        $grouping = $generator->create_grouping(array('courseid' => $course->id, 'idnumber' => $idnumber2));
        $this->assertEquals($grouping, groups_get_grouping_by_idnumber($course->id, $idnumber2));

        /*
         * Grouping idnumbers are unique within a course so test that we don't
         * retrieve groupings for the first course.
         */

        // Create a second course.
        $course = $generator->create_course(array('category' => $cat->id));

        // An empty idnumber should always return a false value.
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, ''));
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, null));

        // Our existing idnumbers shouldn't be returned here as we're in a different course.
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, $idnumber1));
        $this->assertFalse(groups_get_grouping_by_idnumber($course->id, $idnumber2));

        // We should be able to reuse the idnumbers again since this is a different course.
        $grouping = $generator->create_grouping(array('courseid' => $course->id, 'idnumber' => $idnumber1));
        $this->assertEquals($grouping, groups_get_grouping_by_idnumber($course->id, $idnumber1));

        $grouping = $generator->create_grouping(array('courseid' => $course->id, 'idnumber' => $idnumber2));
        $this->assertEquals($grouping, groups_get_grouping_by_idnumber($course->id, $idnumber2));
    }

    public function test_groups_get_members_ids_sql(): void {
        global $DB;

        $this->resetAfterTest(true);

        $generator = $this->getDataGenerator();

        $course = $generator->create_course();
        $coursecontext = \context_course::instance($course->id);
        $student1 = $generator->create_user();
        $student2 = $generator->create_user();
        $plugin = enrol_get_plugin('manual');
        $role = $DB->get_record('role', array('shortname' => 'student'));
        $group = $generator->create_group(array('courseid' => $course->id));
        $instance = $DB->get_record('enrol', array(
                'courseid' => $course->id,
                'enrol' => 'manual',
        ));

        $this->assertNotEquals($instance, false);

        // Enrol users in the course.
        $plugin->enrol_user($instance, $student1->id, $role->id);
        $plugin->enrol_user($instance, $student2->id, $role->id);

        list($sql, $params) = groups_get_members_ids_sql($group->id);

        // Test an empty group.
        $users = $DB->get_records_sql($sql, $params);
        $this->assertFalse(array_key_exists($student1->id, $users));

        // Test with a group member.
        groups_add_member($group->id, $student1->id);
        $users = $DB->get_records_sql($sql, $params);
        $this->assertTrue(array_key_exists($student1->id, $users));
    }

    public function test_groups_get_members_ids_sql_multiple_groups(): void {
        global $DB;

        $this->resetAfterTest(true);

        $generator = $this->getDataGenerator();

        $course = $generator->create_course();
        $student1 = $generator->create_user();
        $student2 = $generator->create_user();
        $plugin = enrol_get_plugin('manual');
        $role = $DB->get_record('role', array('shortname' => 'student'));
        $group1 = $generator->create_group(array('courseid' => $course->id));
        $group2 = $generator->create_group(array('courseid' => $course->id));
        $groupids = [
            $group1->id,
            $group2->id,
        ];
        $instance = $DB->get_record('enrol', array(
                'courseid' => $course->id,
                'enrol' => 'manual',
        ));

        $this->assertNotEquals($instance, false);

        // Enrol users in the course.
        $plugin->enrol_user($instance, $student1->id, $role->id);
        $plugin->enrol_user($instance, $student2->id, $role->id);

        list($sql, $params) = groups_get_members_ids_sql($groupids);

        // Test an empty group.
        $users = $DB->get_records_sql($sql, $params);
        $this->assertFalse(array_key_exists($student1->id, $users));

        // Test with a member of one of the two group.
        groups_add_member($group1->id, $student1->id);
        $users = $DB->get_records_sql($sql, $params);
        $this->assertTrue(array_key_exists($student1->id, $users));

        // Test with members of two groups.
        groups_add_member($group2->id, $student2->id);
        $users = $DB->get_records_sql($sql, $params);
        $this->assertTrue(array_key_exists($student1->id, $users));
        $this->assertTrue(array_key_exists($student2->id, $users));
    }

    public function test_groups_get_members_ids_sql_multiple_groups_join_types(): void {
        global $DB;

        $this->resetAfterTest(true);

        $generator = $this->getDataGenerator();

        $course = $generator->create_course();
        $student1 = $generator->create_user();
        $student2 = $generator->create_user();
        $student3 = $generator->create_user();
        $student4 = $generator->create_user();
        $student5 = $generator->create_user();
        $student6 = $generator->create_user();
        $plugin = enrol_get_plugin('manual');
        $role = $DB->get_record('role', array('shortname' => 'student'));
        $group1 = $generator->create_group(array('courseid' => $course->id));
        $group2 = $generator->create_group(array('courseid' => $course->id));
        $group3 = $generator->create_group(array('courseid' => $course->id));
        // Only groups 1 and 2 specified in SQL (group 3 helps cover the None case).
        $groupids = [
            $group1->id,
            $group2->id,
        ];
        $instance = $DB->get_record('enrol', array(
                'courseid' => $course->id,
                'enrol' => 'manual',
        ));

        $this->assertNotEquals($instance, false);

        // Enrol users in the course.
        $plugin->enrol_user($instance, $student1->id, $role->id);
        $plugin->enrol_user($instance, $student2->id, $role->id);
        $plugin->enrol_user($instance, $student3->id, $role->id);
        $plugin->enrol_user($instance, $student4->id, $role->id);
        $plugin->enrol_user($instance, $student5->id, $role->id);
        $plugin->enrol_user($instance, $student6->id, $role->id);

        // Generate SQL with the different groups join types for members of group1 and group2.
        list($sqlany, $paramsany) = groups_get_members_ids_sql($groupids, null, GROUPS_JOIN_ANY);
        list($sqlall, $paramsall) = groups_get_members_ids_sql($groupids, null, GROUPS_JOIN_ALL);
        list($sqlnone, $paramsnone) = groups_get_members_ids_sql($groupids, null, GROUPS_JOIN_NONE);

        // Any - Test empty groups, no matches.
        $users = $DB->get_records_sql($sqlany, $paramsany);
        $this->assertFalse(array_key_exists($student1->id, $users));
        $this->assertFalse(array_key_exists($student2->id, $users));
        $this->assertFalse(array_key_exists($student3->id, $users));
        $this->assertFalse(array_key_exists($student4->id, $users));
        $this->assertFalse(array_key_exists($student5->id, $users));
        $this->assertFalse(array_key_exists($student6->id, $users));

        // All - Test empty groups, no matches.
        $users = $DB->get_records_sql($sqlall, $paramsall);
        $this->assertFalse(array_key_exists($student1->id, $users));
        $this->assertFalse(array_key_exists($student2->id, $users));
        $this->assertFalse(array_key_exists($student3->id, $users));
        $this->assertFalse(array_key_exists($student4->id, $users));
        $this->assertFalse(array_key_exists($student5->id, $users));
        $this->assertFalse(array_key_exists($student6->id, $users));

        // None - Test empty groups, all match.
        $users = $DB->get_records_sql($sqlnone, $paramsnone);
        $this->assertTrue(array_key_exists($student1->id, $users));
        $this->assertTrue(array_key_exists($student2->id, $users));
        $this->assertTrue(array_key_exists($student3->id, $users));
        $this->assertTrue(array_key_exists($student4->id, $users));
        $this->assertTrue(array_key_exists($student5->id, $users));
        $this->assertTrue(array_key_exists($student6->id, $users));

        // Assign various group member combinations.
        groups_add_member($group1->id, $student1->id);
        groups_add_member($group1->id, $student2->id);
        groups_add_member($group1->id, $student3->id);
        groups_add_member($group2->id, $student2->id);
        groups_add_member($group2->id, $student3->id);
        groups_add_member($group2->id, $student4->id);
        groups_add_member($group3->id, $student5->id);

        // Any - Test students in one or both of groups 1 and 2 matched.
        $users = $DB->get_records_sql($sqlany, $paramsany);
        $this->assertTrue(array_key_exists($student1->id, $users));
        $this->assertTrue(array_key_exists($student2->id, $users));
        $this->assertTrue(array_key_exists($student3->id, $users));
        $this->assertTrue(array_key_exists($student4->id, $users));
        $this->assertFalse(array_key_exists($student5->id, $users));
        $this->assertFalse(array_key_exists($student6->id, $users));

        // All - Test only students in both groups 1 and 2 matched.
        $users = $DB->get_records_sql($sqlall, $paramsall);
        $this->assertTrue(array_key_exists($student2->id, $users));
        $this->assertTrue(array_key_exists($student3->id, $users));
        $this->assertFalse(array_key_exists($student1->id, $users));
        $this->assertFalse(array_key_exists($student4->id, $users));
        $this->assertFalse(array_key_exists($student5->id, $users));
        $this->assertFalse(array_key_exists($student6->id, $users));

        // None - Test only students not in group 1 or 2 matched.
        $users = $DB->get_records_sql($sqlnone, $paramsnone);
        $this->assertTrue(array_key_exists($student5->id, $users));
        $this->assertTrue(array_key_exists($student6->id, $users));
        $this->assertFalse(array_key_exists($student1->id, $users));
        $this->assertFalse(array_key_exists($student2->id, $users));
        $this->assertFalse(array_key_exists($student3->id, $users));
        $this->assertFalse(array_key_exists($student4->id, $users));
    }

    public function test_groups_get_members_ids_sql_valid_context(): void {
        global $DB;

        $this->resetAfterTest(true);

        $generator = $this->getDataGenerator();

        $course = $generator->create_course();
        $coursecontext = \context_course::instance($course->id);
        $student1 = $generator->create_user();
        $student2 = $generator->create_user();
        $plugin = enrol_get_plugin('manual');
        $role = $DB->get_record('role', array('shortname' => 'student'));
        $group = $generator->create_group(array('courseid' => $course->id));
        $instance = $DB->get_record('enrol', array(
                'courseid' => $course->id,
                'enrol' => 'manual',
        ));

        $this->assertNotEquals($instance, false);

        // Enrol users in the course.
        $plugin->enrol_user($instance, $student1->id, $role->id);
        $plugin->enrol_user($instance, $student2->id, $role->id);

        // Add student1 to the group.
        groups_add_member($group->id, $student1->id);

        // Test with members at any group and with a valid $context.
        list($sql, $params) = groups_get_members_ids_sql(USERSWITHOUTGROUP, $coursecontext);
        $users = $DB->get_records_sql($sql, $params);
        $this->assertFalse(array_key_exists($student1->id, $users));
        $this->assertTrue(array_key_exists($student2->id, $users));
    }

    public function test_groups_get_members_ids_sql_empty_context(): void {
        global $DB;

        $this->resetAfterTest(true);

        $generator = $this->getDataGenerator();

        $course = $generator->create_course();
        $coursecontext = \context_course::instance($course->id);
        $student1 = $generator->create_user();
        $student2 = $generator->create_user();
        $plugin = enrol_get_plugin('manual');
        $role = $DB->get_record('role', array('shortname' => 'student'));
        $group = $generator->create_group(array('courseid' => $course->id));
        $instance = $DB->get_record('enrol', array(
                'courseid' => $course->id,
                'enrol' => 'manual',
        ));

        $this->assertNotEquals($instance, false);

        // Enrol users in the course.
        $plugin->enrol_user($instance, $student1->id, $role->id);
        $plugin->enrol_user($instance, $student2->id, $role->id);

        // Add student1 to the group.
        groups_add_member($group->id, $student1->id);

        // Test with members at any group and without the $context.
        $this->expectException('coding_exception');
        list($sql, $params) = groups_get_members_ids_sql(USERSWITHOUTGROUP);
    }

    public function test_groups_get_members_ids_sql_invalid_context(): void {
        global $DB;

        $this->resetAfterTest(true);

        $generator = $this->getDataGenerator();

        $course = $generator->create_course();
        $coursecontext = \context_course::instance($course->id);
        $student1 = $generator->create_user();
        $student2 = $generator->create_user();
        $plugin = enrol_get_plugin('manual');
        $role = $DB->get_record('role', array('shortname' => 'student'));
        $group = $generator->create_group(array('courseid' => $course->id));
        $instance = $DB->get_record('enrol', array(
                'courseid' => $course->id,
                'enrol' => 'manual',
        ));

        $this->assertNotEquals($instance, false);

        // Enrol users in the course.
        $plugin->enrol_user($instance, $student1->id, $role->id);
        $plugin->enrol_user($instance, $student2->id, $role->id);

        // Add student1 to the group.
        groups_add_member($group->id, $student1->id);

        // Test with members at any group and with an invalid $context.
        $syscontext = \context_system::instance();
        $this->expectException('coding_exception');
        list($sql, $params) = groups_get_members_ids_sql(USERSWITHOUTGROUP, $syscontext);
    }

    /**
     * Test retrieving users with concatenated group names from a course
     */
    public function test_groups_get_names_concat_sql(): void {
        global $DB;

        $this->resetAfterTest();

        // Create a course containing two groups.
        $course = $this->getDataGenerator()->create_course();
        $group1 = $this->getDataGenerator()->create_group(['courseid' => $course->id]);
        $group2 = $this->getDataGenerator()->create_group(['courseid' => $course->id]);

        // Create first user, add them to group 1 and group 2.
        $user1 = $this->getDataGenerator()->create_and_enrol($course, 'student');
        $this->getDataGenerator()->create_group_member(['userid' => $user1->id, 'groupid' => $group1->id]);
        $this->getDataGenerator()->create_group_member(['userid' => $user1->id, 'groupid' => $group2->id]);

        // Create second user, add them to group 1 only.
        $user2 = $this->getDataGenerator()->create_and_enrol($course, 'student');
        $this->getDataGenerator()->create_group_member(['userid' => $user2->id, 'groupid' => $group1->id]);

        // Call our method, and assertion.
        [$sql, $params] = groups_get_names_concat_sql($course->id);
        $records = $DB->get_records_sql($sql, $params);

        $this->assertEqualsCanonicalizing([
            (object) [
                'userid' => $user1->id,
                'groupnames' => "{$group1->name}, {$group2->name}",
            ],
            (object) [
                'userid' => $user2->id,
                'groupnames' => $group1->name,
            ],
        ], $records);
    }

    public function test_groups_get_group_by_name(): void {
        $this->resetAfterTest(true);

        $generator = $this->getDataGenerator();

        // Create a course category and course.
        $cat = $generator->create_category(array('parent' => 0));
        $course = $generator->create_course(array('category' => $cat->id));

        $name1 = 'Name 1';
        $name2 = 'Name 2';

        // Test with an empty and a null idnumber.
        $this->assertFalse(groups_get_group_by_name($course->id, ''));
        $this->assertFalse(groups_get_group_by_name($course->id, null));

        // Even when a group exists.
        $generator->create_group(array('courseid' => $course->id));
        $this->assertFalse(groups_get_group_by_name($course->id, ''));
        $this->assertFalse(groups_get_group_by_name($course->id, null));

        // Test with a valid name, but one that doesn't exist yet.
        $this->assertFalse(groups_get_group_by_name($course->id, $name1));
        $this->assertFalse(groups_get_group_by_name($course->id, $name2));

        // We should now have a valid group returned by the name search.
        $group1 = $generator->create_group(array('courseid' => $course->id, 'name' => $name1));
        $this->assertEquals($group1->id, groups_get_group_by_name($course->id, $name1));
        $this->assertFalse(groups_get_group_by_name($course->id, $name2));

        // We should now have a two valid groups returned by the name search.
        $group2 = $generator->create_group(array('courseid' => $course->id, 'name' => $name2));
        $this->assertEquals($group1->id, groups_get_group_by_name($course->id, $name1));
        $this->assertEquals($group2->id, groups_get_group_by_name($course->id, $name2));

        // Delete a group.
        $this->assertTrue(groups_delete_group($group1));
        $this->assertFalse(groups_get_group_by_name($course->id, $name1));
        $this->assertEquals($group2->id, groups_get_group_by_name($course->id, $name2));

        /*
         * Group idnumbers are unique within a course so test that we don't
         * retrieve groups for the first course.
         */

        // Create a second course.
        $course = $generator->create_course(array('category' => $cat->id));

        // An empty name should always return a false value.
        $this->assertFalse(groups_get_group_by_name($course->id, ''));
        $this->assertFalse(groups_get_group_by_name($course->id, null));

        // Our existing names shouldn't be returned here as we're in a different course.
        $this->assertFalse(groups_get_group_by_name($course->id, $name1));
        $this->assertFalse(groups_get_group_by_name($course->id, $name2));

        // We should be able to reuse the idnumbers again since this is a different course.
        $group1 = $generator->create_group(array('courseid' => $course->id, 'name' => $name1));
        $this->assertEquals($group1->id, groups_get_group_by_name($course->id, $name1));

        $group2 = $generator->create_group(array('courseid' => $course->id, 'name' => $name2));
        $this->assertEquals($group2->id, groups_get_group_by_name($course->id, $name2));
    }

    public function test_groups_get_grouping(): void {
        $this->resetAfterTest(true);

        $generator = $this->getDataGenerator();

        // Create a course category and course.
        $cat = $generator->create_category(array('parent' => 0));
        $course = $generator->create_course(array('category' => $cat->id));

        $name1 = 'Grouping 1';
        $name2 = 'Grouping 2';

        // Test with an empty and a null idnumber.
        $this->assertFalse(groups_get_grouping_by_name($course->id, ''));
        $this->assertFalse(groups_get_grouping_by_name($course->id, null));

        // Even when a group exists.
        $generator->create_group(array('courseid' => $course->id));
        $this->assertFalse(groups_get_grouping_by_name($course->id, ''));
        $this->assertFalse(groups_get_grouping_by_name($course->id, null));

        // Test with a valid name, but one that doesn't exist yet.
        $this->assertFalse(groups_get_grouping_by_name($course->id, $name1));
        $this->assertFalse(groups_get_grouping_by_name($course->id, $name2));

        // We should now have a valid group returned by the name search.
        $group1 = $generator->create_grouping(array('courseid' => $course->id, 'name' => $name1));
        $this->assertEquals($group1->id, groups_get_grouping_by_name($course->id, $name1));
        $this->assertFalse(groups_get_grouping_by_name($course->id, $name2));

        // We should now have a two valid groups returned by the name search.
        $group2 = $generator->create_grouping(array('courseid' => $course->id, 'name' => $name2));
        $this->assertEquals($group1->id, groups_get_grouping_by_name($course->id, $name1));
        $this->assertEquals($group2->id, groups_get_grouping_by_name($course->id, $name2));

        // Delete a group.
        $this->assertTrue(groups_delete_grouping($group1));
        $this->assertFalse(groups_get_grouping_by_name($course->id, $name1));
        $this->assertEquals($group2->id, groups_get_grouping_by_name($course->id, $name2));

        /*
         * Group idnumbers are unique within a course so test that we don't
         * retrieve groups for the first course.
         */

        // Create a second course.
        $course = $generator->create_course(array('category' => $cat->id));

        // An empty name should always return a false value.
        $this->assertFalse(groups_get_grouping_by_name($course->id, ''));
        $this->assertFalse(groups_get_grouping_by_name($course->id, null));

        // Our existing names shouldn't be returned here as we're in a different course.
        $this->assertFalse(groups_get_grouping_by_name($course->id, $name1));
        $this->assertFalse(groups_get_grouping_by_name($course->id, $name2));

        // We should be able to reuse the idnumbers again since this is a different course.
        $group1 = $generator->create_grouping(array('courseid' => $course->id, 'name' => $name1));
        $this->assertEquals($group1->id, groups_get_grouping_by_name($course->id, $name1));

        $group2 = $generator->create_grouping(array('courseid' => $course->id, 'name' => $name2));
        $this->assertEquals($group2->id, groups_get_grouping_by_name($course->id, $name2));
    }

    public function test_groups_get_course_data(): void {
        $this->resetAfterTest(true);

        $generator = $this->getDataGenerator();

        // Create a course category and course.
        $cat = $generator->create_category(array('parent' => 0));
        $course = $generator->create_course(array('category' => $cat->id));
        $grouping1 = $generator->create_grouping(array('courseid' => $course->id, 'name' => 'Grouping 1'));
        $grouping2 = $generator->create_grouping(array('courseid' => $course->id, 'name' => 'Grouping 2'));
        $group1 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 1'));
        $group2 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 2'));
        $group3 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 3'));
        $group4 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 4'));

        // Assign the groups to groupings.
        $this->assertTrue(groups_assign_grouping($grouping1->id, $group1->id));
        $this->assertTrue(groups_assign_grouping($grouping1->id, $group2->id));
        $this->assertTrue(groups_assign_grouping($grouping2->id, $group3->id));
        $this->assertTrue(groups_assign_grouping($grouping2->id, $group4->id));

        // Get the data.
        $data = groups_get_course_data($course->id);
        $this->assertInstanceOf('stdClass', $data);
        $this->assertObjectHasProperty('groups', $data);
        $this->assertObjectHasProperty('groupings', $data);
        $this->assertObjectHasProperty('mappings', $data);

        // Test we have the expected items returns.
        $this->assertCount(4, $data->groups);
        $this->assertCount(2, $data->groupings);
        $this->assertCount(4, $data->mappings);

        // Check we have the expected groups.
        $this->assertArrayHasKey($group1->id, $data->groups);
        $this->assertArrayHasKey($group2->id, $data->groups);
        $this->assertArrayHasKey($group3->id, $data->groups);
        $this->assertArrayHasKey($group4->id, $data->groups);

        // Test a group-id is mapped correctly.
        $this->assertSame($group3->name, $data->groups[$group3->id]->name);

        // Check we have the expected number of groupings.
        $this->assertArrayHasKey($grouping1->id, $data->groupings);
        $this->assertArrayHasKey($grouping2->id, $data->groupings);

        // Test a grouping-id is mapped correctly.
        $this->assertEquals($grouping2->name, $data->groupings[$grouping2->id]->name);

        // Test that all of the mappings are correct.
        $grouping1maps = 0;
        $grouping2maps = 0;
        $group1maps = 0;
        $group2maps = 0;
        $group3maps = 0;
        $group4maps = 0;
        foreach ($data->mappings as $mapping) {
            if ($mapping->groupingid === $grouping1->id) {
                $grouping1maps++;
                $this->assertContainsEquals($mapping->groupid, array($group1->id, $group2->id));
            } else if ($mapping->groupingid === $grouping2->id) {
                $grouping2maps++;
                $this->assertContainsEquals($mapping->groupid, array($group3->id, $group4->id));
            } else {
                $this->fail('Unexpected groupingid');
            }
            switch ($mapping->groupid) {
                case $group1->id : $group1maps++; break;
                case $group2->id : $group2maps++; break;
                case $group3->id : $group3maps++; break;
                case $group4->id : $group4maps++; break;
            }
        }
        $this->assertEquals(2, $grouping1maps);
        $this->assertEquals(2, $grouping2maps);
        $this->assertEquals(1, $group1maps);
        $this->assertEquals(1, $group2maps);
        $this->assertEquals(1, $group3maps);
        $this->assertEquals(1, $group4maps);

        // Test the groups_get_all_groups which uses this functionality.
        $groups  = groups_get_all_groups($course->id);
        $this->assertCount(4, $groups);
        $this->assertArrayHasKey($group1->id, $groups);
        $this->assertArrayHasKey($group2->id, $groups);
        $this->assertArrayHasKey($group3->id, $groups);
        $this->assertArrayHasKey($group4->id, $groups);

        $groups  = groups_get_all_groups($course->id, null, $grouping1->id);
        $this->assertCount(2, $groups);
        $this->assertArrayHasKey($group1->id, $groups);
        $this->assertArrayHasKey($group2->id, $groups);
        $this->assertArrayNotHasKey($group3->id, $groups);
        $this->assertArrayNotHasKey($group4->id, $groups);

        $groups  = groups_get_all_groups($course->id, null, $grouping2->id);
        $this->assertCount(2, $groups);
        $this->assertArrayNotHasKey($group1->id, $groups);
        $this->assertArrayNotHasKey($group2->id, $groups);
        $this->assertArrayHasKey($group3->id, $groups);
        $this->assertArrayHasKey($group4->id, $groups);

        // Test this function using an alternate column for the result index
        $groups  = groups_get_all_groups($course->id, null, $grouping2->id, 'g.name, g.id');
        $this->assertCount(2, $groups);
        $this->assertArrayNotHasKey($group3->id, $groups);
        $this->assertArrayHasKey($group3->name, $groups);
        $this->assertEquals($group3->id, $groups[$group3->name]->id);
    }

    /**
     * Tests for groups_group_visible.
     */
    public function test_groups_group_visible(): void {
        global $CFG, $DB;

        $generator = $this->getDataGenerator();
        $this->resetAfterTest();
        $this->setAdminUser();

        // Create a course category, course and groups.
        $cat = $generator->create_category(array('parent' => 0));
        $course = $generator->create_course(array('category' => $cat->id));
        $coursecontext = \context_course::instance($course->id);
        $group1 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 1'));
        $group2 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 2'));
        $group3 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 3'));
        $group4 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 4'));

        // Create cm.
        $assign = $generator->create_module("assign", array('course' => $course->id));
        $cm = get_coursemodule_from_instance("assign", $assign->id);

        // Create users.
        $user1 = $generator->create_user();
        $user2 = $generator->create_user();
        $user3 = $generator->create_user();

        // Enrol users into the course.
        $generator->enrol_user($user1->id, $course->id);
        $generator->enrol_user($user2->id, $course->id);

        // Assign groups.
        groups_add_member($group1, $user2);

        // Give capability at course level to the user to access all groups.
        $role = $DB->get_field("role", "id", array("shortname" => "manager"));
        $generator->enrol_user($user3->id, $course->id, $role);
        // Make sure the user has the capability.
        assign_capability('moodle/site:accessallgroups', CAP_ALLOW, $role, $coursecontext->id);

        // No groups , not forced.
        $result = groups_group_visible($group1->id, $course, null, $user1->id);
        $this->assertTrue($result);
        $result = groups_group_visible(0, $course, null, $user1->id);
        $this->assertTrue($result); // Requesting all groups.

        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertFalse($result); // Cm with separate groups.
        $result = groups_group_visible($group1->id, $course, $cm, $user2->id);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with visible groups.

        // No groups, forced.
        $course->groupmode = NOGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_group_visible($group1->id, $course, null, $user1->id);
        $this->assertTrue($result);
        $result = groups_group_visible(0, $course, null, $user1->id);
        $this->assertTrue($result); // Requesting all groups.

        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with separate groups.
        $result = groups_group_visible($group1->id, $course, $cm, $user2->id);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with visible groups.

        // Visible groups, forced.
        $course->groupmode = VISIBLEGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_group_visible($group1->id, $course, null, $user1->id);
        $this->assertTrue($result);
        $result = groups_group_visible(0, $course, null, $user1->id);
        $this->assertTrue($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with separate groups.
        $result = groups_group_visible($group1->id, $course, $cm, $user2->id);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with visible groups.

        // Visible groups, not forced.
        $course->groupmode = VISIBLEGROUPS;
        $course->groupmodeforce = false;
        update_course($course);
        $result = groups_group_visible($group1->id, $course, null, $user1->id);
        $this->assertTrue($result);
        $result = groups_group_visible(0, $course, null, $user1->id);
        $this->assertTrue($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertFalse($result); // Cm with separate groups.
        $result = groups_group_visible($group1->id, $course, $cm, $user2->id);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with visible groups.

        // Separate groups, forced.
        $course->groupmode = SEPARATEGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_group_visible($group1->id, $course, null, $user1->id);
        $this->assertFalse($result);
        $result = groups_group_visible($group1->id, $course, null, $user2->id);
        $this->assertTrue($result);
        $result = groups_group_visible(0, $course, null, $user2->id);
        $this->assertFalse($result); // Requesting all groups.
        $result = groups_group_visible(0, $course, null, $user3->id);
        $this->assertTrue($result); // Requesting all groups.
        $result = groups_group_visible($group1->id, $course, null, $user3->id);
        $this->assertTrue($result); // Make sure user with access to all groups can see any group.

        $cm->groupmode = NOGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertFalse($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertFalse($result); // Cm with separate groups.
        $result = groups_group_visible($group1->id, $course, $cm, $user2->id);
        $this->assertTrue($result); // Cm with separate groups.
        $result = groups_group_visible($group1->id, $course, $cm, $user3->id);
        $this->assertTrue($result); // Make sure user with access to all groups can see any group.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertFalse($result); // Cm with visible groups.

        // Separate groups, not forced.
        $course->groupmode = SEPARATEGROUPS;
        $course->groupmodeforce = false;
        update_course($course);
        $result = groups_group_visible($group1->id, $course, null, $user1->id);
        $this->assertFalse($result);
        $result = groups_group_visible($group1->id, $course, null, $user2->id);
        $this->assertTrue($result);
        $result = groups_group_visible(0, $course, null, $user2->id);
        $this->assertFalse($result); // Requesting all groups.
        $result = groups_group_visible(0, $course, null, $user3->id);
        $this->assertTrue($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertFalse($result); // Cm with separate groups.
        $result = groups_group_visible($group1->id, $course, $cm, $user2->id);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_group_visible($group1->id, $course, $cm, $user1->id);
        $this->assertTrue($result); // Cm with visible groups.
    }

    function test_groups_get_groupmode(): void {
        global $DB;
        $generator = $this->getDataGenerator();
        $this->resetAfterTest();
        $this->setAdminUser();

        // Create a course with no groups forcing.
        $course1 = $generator->create_course();

        // Create cm1 with no groups, cm1 with visible groups, cm2 with separate groups and cm3 with visible groups.
        $assign1 = $generator->create_module("assign", array('course' => $course1->id));
        $assign2 = $generator->create_module("assign", array('course' => $course1->id),
                array('groupmode' => SEPARATEGROUPS));
        $assign3 = $generator->create_module("assign", array('course' => $course1->id),
                array('groupmode' => VISIBLEGROUPS));

        // Request data for tests.
        $cm1 = get_coursemodule_from_instance("assign", $assign1->id);
        $cm2 = get_coursemodule_from_instance("assign", $assign2->id);
        $cm3 = get_coursemodule_from_instance("assign", $assign3->id);
        $modinfo = get_fast_modinfo($course1->id);

        // Assert that any method of getting activity groupmode returns the correct result.
        $this->assertEquals(NOGROUPS, groups_get_activity_groupmode($cm1));
        $this->assertEquals(NOGROUPS, groups_get_activity_groupmode($cm1, $course1));
        $this->assertEquals(NOGROUPS, groups_get_activity_groupmode($modinfo->cms[$cm1->id]));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($cm2));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($cm2, $course1));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($modinfo->cms[$cm2->id]));
        $this->assertEquals(VISIBLEGROUPS, groups_get_activity_groupmode($cm3));
        $this->assertEquals(VISIBLEGROUPS, groups_get_activity_groupmode($cm3, $course1));
        $this->assertEquals(VISIBLEGROUPS, groups_get_activity_groupmode($modinfo->cms[$cm3->id]));

        // Update the course set the groupmode SEPARATEGROUPS but not forced.
        update_course((object)array('id' => $course1->id, 'groupmode' => SEPARATEGROUPS));
        // Re-request the data from DB.
        $course1 = $DB->get_record('course', array('id' => $course1->id));
        $modinfo = get_fast_modinfo($course1->id);

        // Existing activities are not changed.
        $this->assertEquals(NOGROUPS, groups_get_activity_groupmode($cm1));
        $this->assertEquals(NOGROUPS, groups_get_activity_groupmode($cm1, $course1));
        $this->assertEquals(NOGROUPS, groups_get_activity_groupmode($modinfo->cms[$cm1->id]));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($cm2));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($cm2, $course1));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($modinfo->cms[$cm2->id]));
        $this->assertEquals(VISIBLEGROUPS, groups_get_activity_groupmode($cm3));
        $this->assertEquals(VISIBLEGROUPS, groups_get_activity_groupmode($cm3, $course1));
        $this->assertEquals(VISIBLEGROUPS, groups_get_activity_groupmode($modinfo->cms[$cm3->id]));

        // Update the course set the groupmode SEPARATEGROUPS and forced.
        update_course((object)array('id' => $course1->id, 'groupmode' => SEPARATEGROUPS, 'groupmodeforce' => true));
        // Re-request the data from DB.
        $course1 = $DB->get_record('course', array('id' => $course1->id));
        $modinfo = get_fast_modinfo($course1->id);

        // Make sure all activities have separate groups mode now.
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($cm1));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($cm1, $course1));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($modinfo->cms[$cm1->id]));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($cm2));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($cm2, $course1));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($modinfo->cms[$cm2->id]));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($cm3));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($cm3, $course1));
        $this->assertEquals(SEPARATEGROUPS, groups_get_activity_groupmode($modinfo->cms[$cm3->id]));
    }

    /**
     * Tests for groups_allgroups_course_menu() .
     */
    public function test_groups_allgroups_course_menu(): void {
        global $SESSION;

        $this->resetAfterTest();

        // Generate data.
        $course = $this->getDataGenerator()->create_course();
        $record = new \stdClass();
        $record->courseid = $course->id;
        $group1 = $this->getDataGenerator()->create_group($record);
        $group2 = $this->getDataGenerator()->create_group($record);
        $user = $this->getDataGenerator()->create_user();
        $this->getDataGenerator()->enrol_user($user->id, $course->id);
        $this->setUser($user);

        $html = groups_allgroups_course_menu($course, 'someurl.php');
        // Since user is not a part of this group and doesn't have accessallgroups permission,
        // the html should be empty.
        $this->assertEmpty($html);

        groups_add_member($group1->id, $user);
        // Now user can access one of the group. We can't assert an exact match here because of random ids generated by yui. So do
        // partial match to see if all groups are listed or not.
        $html = groups_allgroups_course_menu($course, 'someurl.php');
        $this->assertStringContainsString(format_string($group1->name), $html);
        $this->assertStringNotContainsString(format_string($group2->name), $html);

        $this->setAdminUser();

        // Now user can access everything.
        $html = groups_allgroups_course_menu($course, 'someurl.php');
        $this->assertStringContainsString(format_string($group1->name), $html);
        $this->assertStringContainsString(format_string($group2->name), $html);

        // Make sure separate groups mode, doesn't change anything.
        $course->groupmode = SEPARATEGROUPS;
        update_course($course);
        $html = groups_allgroups_course_menu($course, 'someurl.php');
        $this->assertStringContainsString(format_string($group1->name), $html);
        $this->assertStringContainsString(format_string($group2->name), $html);

        // Make sure Visible groups mode, doesn't change anything.
        $course->groupmode = VISIBLEGROUPS;
        update_course($course);
        $html = groups_allgroups_course_menu($course, 'someurl.php');
        $this->assertStringContainsString(format_string($group1->name), $html);
        $this->assertStringContainsString(format_string($group2->name), $html);

        // Let us test activegroup changes now.
        $this->setUser($user);
        $SESSION->activegroup[$course->id][VISIBLEGROUPS][$course->defaultgroupingid] = 5;
        groups_allgroups_course_menu($course, 'someurl.php', false); // Do not update session.
        $this->assertSame(5, $SESSION->activegroup[$course->id][VISIBLEGROUPS][$course->defaultgroupingid]);
        groups_allgroups_course_menu($course, 'someurl.php', true, $group1->id); // Update session.
        $this->assertSame($group1->id, $SESSION->activegroup[$course->id][VISIBLEGROUPS][$course->defaultgroupingid]);
        // Try to update session with an invalid groupid. It should not accept the invalid id.
        groups_allgroups_course_menu($course, 'someurl.php', true, 256);
        $this->assertEquals($group1->id, $SESSION->activegroup[$course->id][VISIBLEGROUPS][$course->defaultgroupingid]);
    }

    /**
     * This unit test checks that groups_get_all_groups returns groups in
     * alphabetical order even if they are in a grouping.
     */
    public function test_groups_ordering(): void {
        $generator = $this->getDataGenerator();
        $this->resetAfterTest();

        // Create a course category and course.
        $cat = $generator->create_category(array('parent' => 0));
        $course = $generator->create_course(array('category' => $cat->id));
        $grouping = $generator->create_grouping(array('courseid' => $course->id, 'name' => 'Grouping'));

        // Create groups in reverse order.
        $group2 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 2'));
        $group1 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 1'));

        // Assign the groups to the grouping in reverse order.
        $this->assertTrue(groups_assign_grouping($grouping->id, $group2->id));
        $this->assertTrue(groups_assign_grouping($grouping->id, $group1->id));

        // Get all groups and check they are alphabetical.
        $groups = array_values(groups_get_all_groups($course->id, 0));
        $this->assertEquals('Group 1', $groups[0]->name);
        $this->assertEquals('Group 2', $groups[1]->name);

        // Now check the same is true when accessed by grouping.
        $groups = array_values(groups_get_all_groups($course->id, 0, $grouping->id));
        $this->assertEquals('Group 1', $groups[0]->name);
        $this->assertEquals('Group 2', $groups[1]->name);
    }

    /**
     * Tests for groups_get_all_groups when grouping is set and we want members as well.
     */
    public function test_groups_get_all_groups_in_grouping_with_members(): void {
        $generator = $this->getDataGenerator();
        $this->resetAfterTest();

        // Create courses.
        $course1 = $generator->create_course();
        $course2 = $generator->create_course();

        // Create users.
        $c1user1 = $generator->create_user();
        $c12user1 = $generator->create_user();
        $c12user2 = $generator->create_user();

        // Enrol users.
        $generator->enrol_user($c1user1->id, $course1->id);
        $generator->enrol_user($c12user1->id, $course1->id);
        $generator->enrol_user($c12user1->id, $course2->id);
        $generator->enrol_user($c12user2->id, $course1->id);
        $generator->enrol_user($c12user2->id, $course2->id);

        // Create groupings and groups for course1.
        $c1grouping1 = $generator->create_grouping(array('courseid' => $course1->id));
        $c1grouping2 = $generator->create_grouping(array('courseid' => $course1->id));
        $c1group1 = $generator->create_group(array('courseid' => $course1->id));
        $c1group2 = $generator->create_group(array('courseid' => $course1->id));
        $c1group3 = $generator->create_group(array('courseid' => $course1->id));
        groups_assign_grouping($c1grouping1->id, $c1group1->id);
        groups_assign_grouping($c1grouping1->id, $c1group2->id);
        groups_assign_grouping($c1grouping2->id, $c1group3->id);

        // Create groupings and groups for course2.
        $c2grouping1 = $generator->create_grouping(array('courseid' => $course2->id));
        $c2group1 = $generator->create_group(array('courseid' => $course1->id));
        groups_assign_grouping($c2grouping1->id, $c2group1->id);

        // Assign users to groups.
        $generator->create_group_member(array('groupid' => $c1group1->id, 'userid' => $c1user1->id));
        $generator->create_group_member(array('groupid' => $c1group1->id, 'userid' => $c12user1->id));
        $generator->create_group_member(array('groupid' => $c1group2->id, 'userid' => $c12user2->id));
        $generator->create_group_member(array('groupid' => $c2group1->id, 'userid' => $c12user2->id));

        // Test without userid.
        $groups = groups_get_all_groups($course1->id, null, $c1grouping1->id, 'g.*', true);

        $this->assertEqualsCanonicalizing(
                [$c1group1->id, $c1group2->id],
                array_keys($groups)
        );
        $this->assertEquals(
                [$c1user1->id => $c1user1->id, $c12user1->id => $c12user1->id],
                $groups[$c1group1->id]->members
        );
        $this->assertEquals(
                [$c12user2->id => $c12user2->id],
                $groups[$c1group2->id]->members
        );

        // Test with userid.
        $groups = groups_get_all_groups($course1->id, $c1user1->id, $c1grouping1->id, 'g.*', true);

        $this->assertEquals([$c1group1->id], array_keys($groups));
        $this->assertEqualsCanonicalizing(
                [$c1user1->id, $c12user1->id],
                $groups[$c1group1->id]->members
        );
    }

    /**
     * Tests for groups_get_user_groups() method.
     */
    public function test_groups_get_user_groups(): void {
        $this->resetAfterTest(true);
        $generator = $this->getDataGenerator();

        // Create courses.
        $course1 = $generator->create_course();
        $course2 = $generator->create_course();

        // Create users.
        $user1 = $generator->create_user();
        $user2 = $generator->create_user();
        $user3 = $generator->create_user();

        // Enrol users.
        $generator->enrol_user($user1->id, $course1->id);
        $generator->enrol_user($user1->id, $course2->id);
        $generator->enrol_user($user2->id, $course2->id);
        $generator->enrol_user($user3->id, $course2->id);

        // Create groups.
        $group1 = $generator->create_group(array('courseid' => $course1->id));
        $group2 = $generator->create_group(array('courseid' => $course2->id));
        $group3 = $generator->create_group(array('courseid' => $course2->id));

        // Assign users to groups.
        $this->assertTrue($generator->create_group_member(array('groupid' => $group1->id, 'userid' => $user1->id)));
        $this->assertTrue($generator->create_group_member(array('groupid' => $group2->id, 'userid' => $user2->id)));

        // Get user groups.
        $usergroups1 = groups_get_user_groups($course1->id, $user1->id);
        $usergroups2 = groups_get_user_groups($course2->id, $user2->id);;

        // Assert return data.
        $this->assertEquals($group1->id, $usergroups1[0][0]);
        $this->assertEquals($group2->id, $usergroups2[0][0]);

        // Now, test with groupings.
        $grouping1 = $generator->create_grouping(array('courseid' => $course1->id));
        $grouping2 = $generator->create_grouping(array('courseid' => $course2->id));

        // Assign the groups to grouping.
        groups_assign_grouping($grouping1->id, $group1->id);
        groups_assign_grouping($grouping2->id, $group2->id);
        groups_assign_grouping($grouping2->id, $group3->id);

        // Test with grouping.
        $usergroups1 = groups_get_user_groups($course1->id, $user1->id);
        $usergroups2 = groups_get_user_groups($course2->id, $user2->id);
        $this->assertArrayHasKey($grouping1->id, $usergroups1);
        $this->assertArrayHasKey($grouping2->id, $usergroups2);

        // Test user without a group.
        $usergroups1 = groups_get_user_groups($course2->id, $user3->id);
        $this->assertCount(0, $usergroups1[0]);

        // Test with userid = 0.
        $usergroups1 = groups_get_user_groups($course1->id, 0);
        $usergroups2 = groups_get_user_groups($course2->id, 0);
        $this->assertCount(0, $usergroups1[0]);
        $this->assertCount(0, $usergroups2[0]);

        // Test with courseid = 0.
        $usergroups1 = groups_get_user_groups(0, $user1->id);
        $usergroups2 = groups_get_user_groups(0, $user2->id);
        $this->assertCount(0, $usergroups1[0]);
        $this->assertCount(0, $usergroups2[0]);
    }

    /**
     * Create dummy groups array for use in menu tests
     * @param int $number
     * @return array
     */
    protected function make_group_list($number) {
        $testgroups = array();
        for ($a = 0; $a < $number; $a++) {
            $grp = new \stdClass();
            $grp->id = 100 + $a;
            $grp->name = 'test group ' . $grp->id;
            $testgroups[$grp->id] = $grp;
        }
        return $testgroups;
    }

    public function test_groups_sort_menu_options_empty(): void {
        $this->assertEquals(array(), groups_sort_menu_options(array(), array()));
    }

    public function test_groups_sort_menu_options_allowed_goups_only(): void {
        $this->assertEquals(array(
            100 => 'test group 100',
            101 => 'test group 101',
        ), groups_sort_menu_options($this->make_group_list(2), array()));
    }

    public function test_groups_sort_menu_options_user_goups_only(): void {
        $this->assertEquals(array(
            100 => 'test group 100',
            101 => 'test group 101',
        ), groups_sort_menu_options(array(), $this->make_group_list(2)));
    }

    public function test_groups_sort_menu_options_user_both(): void {
        $this->assertEquals(array(
            1 => array(get_string('mygroups', 'group') => array(
                100 => 'test group 100',
                101 => 'test group 101',
            )),
            2 => array(get_string('othergroups', 'group') => array(
                102 => 'test group 102',
                103 => 'test group 103',
            )),
        ), groups_sort_menu_options($this->make_group_list(4), $this->make_group_list(2)));
    }

    public function test_groups_sort_menu_options_user_both_many_groups(): void {
        $this->assertEquals(array(
            1 => array(get_string('mygroups', 'group') => array(
                100 => 'test group 100',
                101 => 'test group 101',
            )),
            2 => array (get_string('othergroups', 'group') => array(
                102 => 'test group 102',
                103 => 'test group 103',
                104 => 'test group 104',
                105 => 'test group 105',
                106 => 'test group 106',
                107 => 'test group 107',
                108 => 'test group 108',
                109 => 'test group 109',
                110 => 'test group 110',
                111 => 'test group 111',
                112 => 'test group 112',
            )),
        ), groups_sort_menu_options($this->make_group_list(13), $this->make_group_list(2)));
    }

    /**
     * Tests for groups_user_groups_visible.
     */
    public function test_groups_user_groups_visible(): void {
        global $DB;

        $generator = $this->getDataGenerator();
        $this->resetAfterTest();
        $this->setAdminUser();

        // Create a course category, course and groups.
        $cat = $generator->create_category(array('parent' => 0));
        $course = $generator->create_course(array('category' => $cat->id));
        $coursecontext = \context_course::instance($course->id);
        $group1 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 1'));
        $group2 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 2'));
        $group3 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 3'));
        $group4 = $generator->create_group(array('courseid' => $course->id, 'name' => 'Group 4'));

        // Create cm.
        $assign = $generator->create_module("assign", array('course' => $course->id));
        $cm = get_coursemodule_from_instance("assign", $assign->id);

        // Create users.
        $user1 = $generator->create_user(); // Normal user.
        $user2 = $generator->create_user(); // Normal user.
        $user3 = $generator->create_user(); // Teacher, access all groups.
        $user4 = $generator->create_user(); // Normal user.

        // Enrol users into the course.
        $generator->enrol_user($user1->id, $course->id);
        $generator->enrol_user($user2->id, $course->id);
        $generator->enrol_user($user4->id, $course->id);

        // Assign groups.
        // User1 and User4 share groups.
        groups_add_member($group1, $user1);
        groups_add_member($group2, $user2);
        groups_add_member($group1, $user4);

        // Give capability at course level to the user to access all groups.
        $role = $DB->get_field("role", "id", array("shortname" => "manager"));
        $generator->enrol_user($user3->id, $course->id, $role);
        // Make sure the user has the capability.
        assign_capability('moodle/site:accessallgroups', CAP_ALLOW, $role, $coursecontext->id);

        // Normal users in different groups.
        $this->setUser($user1);

        // No groups , not forced.
        $result = groups_user_groups_visible($course, $user2->id);
        $this->assertTrue($result);

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertFalse($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // No groups, forced.
        $course->groupmode = NOGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_user_groups_visible($course, $user2->id);
        $this->assertTrue($result);

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id);
        $this->assertTrue($result); // Cm with visible groups.

        // Visible groups, forced.
        $course->groupmode = VISIBLEGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_user_groups_visible($course, $user2->id);
        $this->assertTrue($result);

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // Visible groups, not forced.
        $course->groupmode = VISIBLEGROUPS;
        $course->groupmodeforce = false;
        update_course($course);
        $result = groups_user_groups_visible($course, $user2->id);
        $this->assertTrue($result);

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertFalse($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // Separate groups, forced.
        $course->groupmode = SEPARATEGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_user_groups_visible($course, $user2->id);
        $this->assertFalse($result);

        $result = groups_user_groups_visible($course, $user3->id);
        $this->assertFalse($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertFalse($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertFalse($result); // Cm with separate groups.

        $result = groups_user_groups_visible($course, $user3->id, $cm);
        $this->assertTrue($result);

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertFalse($result); // Cm with visible groups.

        // Separate groups, not forced.
        $course->groupmode = SEPARATEGROUPS;
        $course->groupmodeforce = false;
        update_course($course);
        $result = groups_user_groups_visible($course, $user2->id);
        $this->assertFalse($result);

        $result = groups_user_groups_visible($course, $user3->id);
        $this->assertFalse($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertFalse($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // Users sharing groups.

        // No groups , not forced.
        $course->groupmode = NOGROUPS;
        $course->groupmodeforce = false;
        update_course($course);

        $result = groups_user_groups_visible($course, $user4->id);
        $this->assertTrue($result);

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // No groups, forced.
        $course->groupmode = NOGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_user_groups_visible($course, $user4->id);
        $this->assertTrue($result);

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // Visible groups, forced.
        $course->groupmode = VISIBLEGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_user_groups_visible($course, $user4->id);
        $this->assertTrue($result);

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // Visible groups, not forced.
        $course->groupmode = VISIBLEGROUPS;
        $course->groupmodeforce = false;
        update_course($course);
        $result = groups_user_groups_visible($course, $user4->id);
        $this->assertTrue($result);

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // Separate groups, forced.
        $course->groupmode = SEPARATEGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_user_groups_visible($course, $user4->id);
        $this->assertTrue($result);

        $result = groups_user_groups_visible($course, $user3->id);
        $this->assertFalse($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $result = groups_user_groups_visible($course, $user3->id, $cm);
        $this->assertTrue($result);

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // Separate groups, not forced.
        $course->groupmode = SEPARATEGROUPS;
        $course->groupmodeforce = false;
        update_course($course);
        $result = groups_user_groups_visible($course, $user4->id);
        $this->assertTrue($result);

        $result = groups_user_groups_visible($course, $user3->id);
        $this->assertFalse($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user4->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // For teacher with access all groups.

        // No groups , not forced.
        $course->groupmode = NOGROUPS;
        $course->groupmodeforce = false;
        update_course($course);

        $this->setUser($user3);

        $result = groups_user_groups_visible($course, $user1->id);
        $this->assertTrue($result);
        $result = groups_user_groups_visible($course, $user1->id);
        $this->assertTrue($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // No groups, forced.
        $course->groupmode = NOGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_user_groups_visible($course, $user1->id);
        $this->assertTrue($result);
        $result = groups_user_groups_visible($course, $user1->id);
        $this->assertTrue($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // Visible groups, forced.
        $course->groupmode = VISIBLEGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_user_groups_visible($course, $user1->id);
        $this->assertTrue($result);
        $result = groups_user_groups_visible($course, $user1->id);
        $this->assertTrue($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // Visible groups, not forced.
        $course->groupmode = VISIBLEGROUPS;
        $course->groupmodeforce = false;
        update_course($course);
        $result = groups_user_groups_visible($course, $user1->id);
        $this->assertTrue($result);
        $result = groups_user_groups_visible($course, $user1->id);
        $this->assertTrue($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // Separate groups, forced.
        $course->groupmode = SEPARATEGROUPS;
        $course->groupmodeforce = true;
        update_course($course);
        $result = groups_user_groups_visible($course, $user1->id);
        $this->assertTrue($result);
        $result = groups_user_groups_visible($course, $user2->id);
        $this->assertTrue($result);
        $result = groups_user_groups_visible($course, $user2->id);
        $this->assertTrue($result); // Requesting all groups.
        $result = groups_user_groups_visible($course, $user3->id);
        $this->assertTrue($result); // Requesting all groups.
        $result = groups_user_groups_visible($course, $user3->id);
        $this->assertTrue($result);

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.
        $result = groups_user_groups_visible($course, $user3->id, $cm);
        $this->assertTrue($result);

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.

        // Separate groups, not forced.
        $course->groupmode = SEPARATEGROUPS;
        $course->groupmodeforce = false;
        update_course($course);
        $result = groups_user_groups_visible($course, $user1->id);
        $this->assertTrue($result);
        $result = groups_user_groups_visible($course, $user2->id);
        $this->assertTrue($result);
        $result = groups_user_groups_visible($course, $user2->id);
        $this->assertTrue($result); // Requesting all groups.
        $result = groups_user_groups_visible($course, $user3->id);
        $this->assertTrue($result); // Requesting all groups.

        $cm->groupmode = NOGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with no groups.

        $cm->groupmode = SEPARATEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.
        $result = groups_user_groups_visible($course, $user2->id, $cm);
        $this->assertTrue($result); // Cm with separate groups.

        $cm->groupmode = VISIBLEGROUPS;
        $result = groups_user_groups_visible($course, $user1->id, $cm);
        $this->assertTrue($result); // Cm with visible groups.
    }

    /**
     * Tests for groups_get_groups_members() method.
     *
     * @covers ::groups_get_groups_members
     */
    public function test_groups_get_groups_members(): void {
        $this->resetAfterTest(true);
        $generator = $this->getDataGenerator();

        // Create courses.
        $course1 = $generator->create_course();
        $course2 = $generator->create_course();

        // Create users.
        $user1 = $generator->create_user();
        $user2 = $generator->create_user();
        $user3 = $generator->create_user();

        // Enrol users.
        $generator->enrol_user($user1->id, $course1->id);
        $generator->enrol_user($user1->id, $course2->id);
        $generator->enrol_user($user2->id, $course2->id);
        $generator->enrol_user($user3->id, $course2->id);

        // Create groups.
        $group1 = $generator->create_group(array('courseid' => $course1->id));
        $group2 = $generator->create_group(array('courseid' => $course2->id));
        $group3 = $generator->create_group(array('courseid' => $course2->id));

        // Assign users to groups.
        $this->assertTrue($generator->create_group_member(array('groupid' => $group1->id, 'userid' => $user1->id)));
        $this->assertTrue($generator->create_group_member(array('groupid' => $group2->id, 'userid' => $user1->id)));
        $this->assertTrue($generator->create_group_member(array('groupid' => $group2->id, 'userid' => $user2->id)));

        // Test get_groups_members (with extra field and ordering).
        $members = groups_get_groups_members([$group1->id, $group2->id], ['lastaccess'], 'u.id ASC');
        $this->assertCount(2, $members);
        $this->assertEquals([$user1->id, $user2->id], array_keys($members));
        $this->assertTrue(isset($members[$user1->id]->lastaccess));
        $this->assertTrue(isset($members[$user2->id]->lastaccess));

        // Group with just one.
        $members = groups_get_groups_members([$group1->id]);
        $this->assertCount(1, $members);
        $this->assertEquals($user1->id, $members[$user1->id]->id);

        // Test the info matches group membership for the entire course.
        $groups  = groups_get_all_groups($course1->id, 0, 0, 'g.*', true);
        $group1withmembers = array_pop($groups);

        // Compare the sorted keys of both arrays (should be list of user ids).
        $members = array_keys($members);
        sort($members);
        $group1members = array_keys($group1withmembers->members);
        sort($group1members);
        $this->assertEquals($members, $group1members);

        // Group with just one plus empty group.
        $members = groups_get_groups_members([$group1->id, $group3->id]);
        $this->assertCount(1, $members);
        $this->assertEquals($user1->id, $members[$user1->id]->id);

        // Empty group.
        $members = groups_get_groups_members([$group3->id]);
        $this->assertCount(0, $members);

        // Our second group.
        $members = groups_get_groups_members([$group2->id]);
        $this->assertEqualsCanonicalizing([$user1->id, $user2->id], array_column($members, 'id'));

        // Test the info matches group membership for the entire course.
        $groups  = groups_get_all_groups($course2->id, 0, 0, 'g.*', true);
        $group2withmembers = $groups[$group2->id];

        // Compare the sorted keys of both arrays (should be list of user ids).
        $members = array_keys($members);
        sort($members);
        $group2members = array_keys($group2withmembers->members);
        sort($group2members);
        $this->assertEquals($members, $group2members);

    }

    /**
     * Tests for groups_get_activity_shared_group_members() method.
     */
    public function test_groups_get_activity_shared_group_members(): void {
        $this->resetAfterTest(true);
        $generator = $this->getDataGenerator();

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

        // Create cm.
        $assign = $generator->create_module("assign", array('course' => $course->id));
        $cm = get_coursemodule_from_instance("assign", $assign->id);

        // Create users.
        $user1 = $generator->create_user();
        $user2 = $generator->create_user();
        $user3 = $generator->create_user();
        $user4 = $generator->create_user();

        // Enrol users.
        $generator->enrol_user($user1->id, $course->id);
        $generator->enrol_user($user2->id, $course->id);
        $generator->enrol_user($user3->id, $course->id);
        $generator->enrol_user($user4->id, $course->id);

        // Create groups.
        $group1 = $generator->create_group(array('courseid' => $course->id));
        $group2 = $generator->create_group(array('courseid' => $course->id));
        $group3 = $generator->create_group(array('courseid' => $course->id));

        // Assign users to groups.
        $generator->create_group_member(array('groupid' => $group1->id, 'userid' => $user1->id));
        $generator->create_group_member(array('groupid' => $group2->id, 'userid' => $user1->id));
        $generator->create_group_member(array('groupid' => $group2->id, 'userid' => $user2->id));
        $generator->create_group_member(array('groupid' => $group3->id, 'userid' => $user3->id));

        // Retrieve users sharing groups with user1.
        $members = groups_get_activity_shared_group_members($cm, $user1->id);
        $this->assertCount(2, $members);
        $this->assertEqualsCanonicalizing([$user1->id, $user2->id], array_keys($members));

        // Retrieve users sharing groups with user2.
        $members = groups_get_activity_shared_group_members($cm, $user2->id);
        $this->assertCount(2, $members);
        $this->assertEqualsCanonicalizing([$user1->id, $user2->id], array_keys($members));

        // Retrieve users sharing groups with user3.
        $members = groups_get_activity_shared_group_members($cm, $user3->id);
        $this->assertCount(1, $members);
        $this->assertEquals($user3->id, $members[$user3->id]->id);

        // Retrieve users sharing groups with user without groups (user4).
        $members = groups_get_activity_shared_group_members($cm, $user4->id);
        $this->assertCount(0, $members);

        // Now, create a different activity using groupings.
        $grouping = $generator->create_grouping(array('courseid' => $course->id, 'name' => 'Grouping 1'));
        // Skip group 2.
        groups_assign_grouping($grouping->id, $group1->id);
        groups_assign_grouping($grouping->id, $group3->id);

        $assign = $generator->create_module("assign", array('course' => $course->id, 'groupingid' => $grouping->id));
        $cm = get_coursemodule_from_instance("assign", $assign->id);

        // Since the activity is forced to groupings (groups 1 and 3), I don't see members of group 2.
        $members = groups_get_activity_shared_group_members($cm, $user1->id);
        $this->assertCount(1, $members);
        $this->assertEquals($user1->id, $members[$user1->id]->id);

        // Add user1 to group 3 (in the grouping).
        $generator->create_group_member(array('groupid' => $group3->id, 'userid' => $user1->id));
        $members = groups_get_activity_shared_group_members($cm, $user1->id);
        $this->assertCount(2, $members);    // Now I see members of group 3.
        $this->assertEqualsCanonicalizing([$user1->id, $user3->id], array_keys($members));
    }

    /**
     * Generate a set of groups with different visibility levels and users to assign to them.
     *
     * @return array
     */
    protected function create_groups_with_visibilty(): array {
        $this->resetAfterTest(true);
        $generator = $this->getDataGenerator();

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

        // Create users.
        $users = [
            1 => $generator->create_user(),
            2 => $generator->create_user(),
            3 => $generator->create_user(),
            4 => $generator->create_user(),
            5 => $generator->create_user(),
        ];

        // Enrol users.
        $generator->enrol_user($users[1]->id, $course->id);
        $generator->enrol_user($users[2]->id, $course->id);
        $generator->enrol_user($users[3]->id, $course->id);
        $generator->enrol_user($users[4]->id, $course->id);
        $generator->enrol_user($users[5]->id, $course->id, 'editingteacher');

        // Create groups.
        $groups = [
            'all' => $generator->create_group(['courseid' => $course->id, 'visibility' => GROUPS_VISIBILITY_ALL]),
            'members' => $generator->create_group(['courseid' => $course->id, 'visibility' => GROUPS_VISIBILITY_MEMBERS]),
            'own' => $generator->create_group(['courseid' => $course->id, 'visibility' => GROUPS_VISIBILITY_OWN]),
            'none' => $generator->create_group(['courseid' => $course->id, 'visibility' => GROUPS_VISIBILITY_NONE]),
        ];

        return [
             $users,
             $groups,
             $course,
        ];
    }

    /**
     * Tests getting groups and group members based on visibility settings.
     *
     * This also covers the groupdata cache, since calls without $withmembers = true use the cache.
     *
     * @covers \groups_get_all_groups()
     */
    public function test_get_all_groups_with_visibility(): void {
        list($users, $groups, $course) = $this->create_groups_with_visibilty();

        // Assign users to groups.
        $generator = $this->getDataGenerator();
        $generator->create_group_member(['groupid' => $groups['all']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[2]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[3]->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $users[4]->id]);

        $this->setUser($users[1]);
        $groups1 = groups_get_all_groups($course->id);
        // User1 is in groups all, members and own, and can see them.
        $this->assertArrayHasKey($groups['all']->id, $groups1);
        $this->assertArrayHasKey($groups['members']->id, $groups1);
        $this->assertArrayHasKey($groups['own']->id, $groups1);
        $this->assertArrayNotHasKey($groups['none']->id, $groups1);
        // User1 can see members of groups all and members, but only themselves in group own.
        $groupsmembers1 = groups_get_all_groups($course->id, 0, 0, 'g.*', true);
        $this->assertArrayHasKey($users[1]->id, $groupsmembers1[$groups['all']->id]->members);
        $this->assertArrayHasKey($users[1]->id, $groupsmembers1[$groups['members']->id]->members);
        $this->assertArrayHasKey($users[2]->id, $groupsmembers1[$groups['members']->id]->members);
        $this->assertArrayHasKey($users[1]->id, $groupsmembers1[$groups['own']->id]->members);
        $this->assertArrayNotHasKey($users[3]->id, $groupsmembers1[$groups['own']->id]->members);

        $this->setUser($users[2]);
        $groups2 = groups_get_all_groups($course->id);
        // User2 is in group members, and can see group all as well.
        $this->assertArrayHasKey($groups['all']->id, $groups2);
        $this->assertArrayHasKey($groups['members']->id, $groups2);
        $this->assertArrayNotHasKey($groups['own']->id, $groups2);
        $this->assertArrayNotHasKey($groups['none']->id, $groups2);
        // User2 can see members of groups all and members.
        $groupsmembers2 = groups_get_all_groups($course->id, 0, 0, 'g.*', true);
        $this->assertArrayHasKey($users[1]->id, $groupsmembers2[$groups['all']->id]->members);
        $this->assertArrayHasKey($users[1]->id, $groupsmembers2[$groups['members']->id]->members);
        $this->assertArrayHasKey($users[2]->id, $groupsmembers2[$groups['members']->id]->members);

        $this->setUser($users[3]);
        $groups3 = groups_get_all_groups($course->id);
        // User3 is in group own, and can see group all as well.
        $this->assertArrayHasKey($groups['all']->id, $groups3);
        $this->assertArrayNotHasKey($groups['members']->id, $groups3);
        $this->assertArrayHasKey($groups['own']->id, $groups3);
        $this->assertArrayNotHasKey($groups['none']->id, $groups3);
        $groupsmembers3 = groups_get_all_groups($course->id, 0, 0, 'g.*', true);
        // User3 can see members of group all, but only themselves in group own.
        $this->assertArrayHasKey($users[1]->id, $groupsmembers3[$groups['all']->id]->members);
        $this->assertArrayHasKey($users[3]->id, $groupsmembers3[$groups['own']->id]->members);
        $this->assertArrayNotHasKey($users[1]->id, $groupsmembers3[$groups['own']->id]->members);

        $this->setUser($users[4]);
        $groups4 = groups_get_all_groups($course->id);
        // User4 can see group all and its members. They are in group none but cannot see it.
        $this->assertArrayHasKey($groups['all']->id, $groups4);
        $this->assertArrayNotHasKey($groups['members']->id, $groups4);
        $this->assertArrayNotHasKey($groups['own']->id, $groups4);
        $this->assertArrayNotHasKey($groups['none']->id, $groups4);
        // User4 can see members of group all.
        $groupsmembers4 = groups_get_all_groups($course->id, 0, 0, 'g.*', true);
        $this->assertArrayHasKey($users[1]->id, $groupsmembers4[$groups['all']->id]->members);

        $this->setUser($users[5]);
        $groups5 = groups_get_all_groups($course->id);
        // User5 is has viewallgroups, so can see all groups.
        $this->assertArrayHasKey($groups['all']->id, $groups5);
        $this->assertArrayHasKey($groups['members']->id, $groups5);
        $this->assertArrayHasKey($groups['own']->id, $groups5);
        $this->assertArrayHasKey($groups['none']->id, $groups5);
        // User5 is has viewallgroups, so can see all members.
        $groupsmembers5 = groups_get_all_groups($course->id, 0, 0, 'g.*', true);
        $this->assertArrayHasKey($users[1]->id, $groupsmembers5[$groups['all']->id]->members);
        $this->assertArrayHasKey($users[1]->id, $groupsmembers5[$groups['members']->id]->members);
        $this->assertArrayHasKey($users[2]->id, $groupsmembers5[$groups['members']->id]->members);
        $this->assertArrayHasKey($users[1]->id, $groupsmembers5[$groups['own']->id]->members);
        $this->assertArrayHasKey($users[3]->id, $groupsmembers5[$groups['own']->id]->members);
        $this->assertArrayHasKey($users[4]->id, $groupsmembers5[$groups['none']->id]->members);

    }

    /**
     * Tests getting groups the current user is a member of, with visibility settings applied.
     *
     * @covers \groups_get_my_groups()
     */
    public function test_get_my_groups_with_visibility(): void {
        list($users, $groups) = $this->create_groups_with_visibilty();

        // Assign users to groups.
        $generator = $this->getDataGenerator();
        $generator->create_group_member(['groupid' => $groups['all']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['all']->id, 'userid' => $users[5]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[5]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[5]->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $users[5]->id]);

        $generator->role_assign('editingteacher', $users[5]->id, \context_system::instance());

        // User can see all groups they are in, except group with visibility::NONE.
        $this->setUser($users[1]);
        $groups1 = groups_get_my_groups();
        $this->assertCount(3, $groups1);
        $groupids1 = array_map(function($groupmember) {
            return $groupmember->groupid;
        }, $groups1);
        sort($groupids1);
        $this->assertEquals([$groups['all']->id, $groups['members']->id, $groups['own']->id], $groupids1);

        $this->setUser($users[5]);
        $groups2 = groups_get_my_groups();
        $this->assertCount(4, $groups2);
        $groupids2 = array_map(function($groupmember) {
            return $groupmember->groupid;
        }, $groups2);
        sort($groupids2);
        $this->assertEquals([$groups['all']->id, $groups['members']->id, $groups['own']->id, $groups['none']->id], $groupids2);
    }

    /**
     * Tests getting groups a user is a member of, with visibility settings applied.
     *
     * @covers \groups_get_user_groups()
     */
    public function test_get_user_groups_with_visibility(): void {
        list($users, $groups, $course) = $this->create_groups_with_visibilty();

        // Assign users to groups.
        $generator = $this->getDataGenerator();
        $generator->create_group_member(['groupid' => $groups['all']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[2]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[3]->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $users[4]->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $users[1]->id]);

        // Run as unprivileged user.
        $this->setUser($users[1]);
        // Own groups - should see all groups except group with visibility::NONE.
        $usergroups1 = groups_get_user_groups($course->id, $users[1]->id);
        $this->assertEquals([$groups['all']->id, $groups['members']->id, $groups['own']->id], $usergroups1[0]);
        // Own groups including hidden - should see all groups.
        $usergroups1hidden = groups_get_user_groups($course->id, $users[1]->id, true);
        $this->assertEquals(
            [$groups['all']->id, $groups['members']->id, $groups['own']->id, $groups['none']->id],
            $usergroups1hidden[0]
        );
        // Fellow member of a group with visiblity::MEMBERS. Should see that group.
        $usergroups2 = groups_get_user_groups($course->id, $users[2]->id);
        $this->assertEquals([$groups['members']->id], $usergroups2[0]);
        // Fellow member of a group with visiblity::OWN. Should not see that group.
        $usergroups3 = groups_get_user_groups($course->id, $users[3]->id);
        $this->assertEmpty($usergroups3[0]);
        // Fellow member of a group with visiblity::NONE. Should not see that group.
        $usergroups4 = groups_get_user_groups($course->id, $users[4]->id);
        $this->assertEmpty($usergroups4[0]);
        // Fellow member of a group with visiblity::NONE including hidden. Should see that group.
        $usergroups4hidden = groups_get_user_groups($course->id, $users[4]->id, true);
        $this->assertEquals([$groups['none']->id], $usergroups4hidden[0]);

        // Run as a user with viewhiddengroups. Should see all group memberships for each member.
        $this->setUser($users[5]);
        $usergroups1 = groups_get_user_groups($course->id, $users[1]->id);
        $this->assertEquals([$groups['all']->id, $groups['members']->id, $groups['own']->id, $groups['none']->id], $usergroups1[0]);
        // Fellow member of a group with visiblity::MEMBERS. Should see that group.
        $usergroups2 = groups_get_user_groups($course->id, $users[2]->id);
        $this->assertEquals([$groups['members']->id], $usergroups2[0]);
        // Fellow member of a group with visiblity::OWN. Should not see that group.
        $usergroups3 = groups_get_user_groups($course->id, $users[3]->id);
        $this->assertEquals([$groups['own']->id], $usergroups3[0]);
        // Fellow member of a group with visiblity::NONE. Should not see that group.
        $usergroups4 = groups_get_user_groups($course->id, $users[4]->id);
        $this->assertEquals([$groups['none']->id], $usergroups4[0]);

    }

    /**
     * Test groups_is_member() using groups with different visibility settings.
     *
     * @covers \groups_is_member()
     */
    public function test_groups_is_member_with_visibility(): void {
        list($users, $groups) = $this->create_groups_with_visibilty();

        // Assign users to groups.
        $generator = $this->getDataGenerator();
        $generator->create_group_member(['groupid' => $groups['all']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[2]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[3]->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $users[4]->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $users[1]->id]);

        // Run as unprivileged user.
        $this->setUser($users[1]);
        $this->assertTrue(groups_is_member($groups['all']->id, $users[1]->id)); // All can see members.
        $this->assertTrue(groups_is_member($groups['members']->id, $users[1]->id)); // Can see members.
        $this->assertTrue(groups_is_member($groups['own']->id, $users[1]->id)); // Can see own membership.
        $this->assertFalse(groups_is_member($groups['none']->id, $users[1]->id)); // Cannot see group.

        $this->assertFalse(groups_is_member($groups['all']->id, $users[2]->id)); // Not a member.
        $this->assertTrue(groups_is_member($groups['members']->id, $users[2]->id)); // Can see other members.
        $this->assertFalse(groups_is_member($groups['own']->id, $users[3]->id)); // Can only see own membership, not others.
        $this->assertFalse(groups_is_member($groups['none']->id, $users[4]->id)); // Cannot see group.

        // Run as a user not in group 1 or 2.
        $this->setUser($users[3]);
        $this->assertTrue(groups_is_member($groups['all']->id, $users[1]->id)); // All can see members.
        $this->assertFalse(groups_is_member($groups['members']->id, $users[2]->id)); // Cannot see members of the group.

        // Run as a user with viewhiddengroups. Should be able to see memberships that exist in any group.
        $this->setUser($users[5]);
        $this->assertTrue(groups_is_member($groups['all']->id, $users[1]->id));
        $this->assertTrue(groups_is_member($groups['members']->id, $users[1]->id));
        $this->assertTrue(groups_is_member($groups['own']->id, $users[1]->id));
        $this->assertTrue(groups_is_member($groups['none']->id, $users[1]->id));

        $this->assertFalse(groups_is_member($groups['all']->id, $users[2]->id)); // Not a member.
        $this->assertTrue(groups_is_member($groups['members']->id, $users[2]->id));
        $this->assertTrue(groups_is_member($groups['own']->id, $users[3]->id));
        $this->assertTrue(groups_is_member($groups['none']->id, $users[4]->id));
    }

    /**
     * Test groups_get_members
     *
     * @covers ::groups_get_members
     */
    public function test_groups_get_members(): void {
        $this->resetAfterTest();

        $course = $this->getDataGenerator()->create_course();
        $userone = $this->getDataGenerator()->create_and_enrol($course);
        $usertwo = $this->getDataGenerator()->create_and_enrol($course);

        $group = $this->getDataGenerator()->create_group(['courseid' => $course->id]);
        $this->getDataGenerator()->create_group_member(['groupid' => $group->id, 'userid' => $userone->id]);
        $this->getDataGenerator()->create_group_member(['groupid' => $group->id, 'userid' => $usertwo->id]);

        $users = groups_get_members($group->id);
        $this->assertEqualsCanonicalizing([$userone->id, $usertwo->id], array_column($users, 'id'));

        // Test invalid group.
        $users = groups_get_members(-1);
        $this->assertEmpty($users);
    }

    /**
     * Test groups_get_members() using groups with different visibility settings.
     *
     * @covers ::groups_get_members
     */
    public function test_groups_get_members_with_visibility(): void {
        list($users, $groups) = $this->create_groups_with_visibilty();

        // Assign users to groups.
        $generator = $this->getDataGenerator();
        $generator->create_group_member(['groupid' => $groups['all']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[2]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[3]->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $users[4]->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $users[1]->id]);

        // Run as unprivileged user.
        $this->setUser($users[1]);
        $this->assertEquals([$users[1]->id],
                array_keys(groups_get_members($groups['all']->id, 'u.id', 'u.id'))); // All can see members.
        $this->assertEquals([$users[1]->id, $users[2]->id],
                array_keys(groups_get_members($groups['members']->id, 'u.id', 'u.id'))); // Can see members.
        $this->assertEquals([$users[1]->id],
                array_keys(groups_get_members($groups['own']->id, 'u.id', 'u.id'))); // Can see own membership.
        $this->assertEquals([], array_keys(groups_get_members($groups['none']->id, 'u.id', 'u.id'))); // Cannot see group.

        // Run as a user not in group 1 or 2.
        $this->setUser($users[3]);
        $this->assertEquals([$users[1]->id],
                array_keys(groups_get_members($groups['all']->id, 'u.id', 'u.id'))); // All can see members.
        $this->assertEquals([], array_keys(groups_get_members($groups['members']->id, 'u.id', 'u.id'))); // Cannot see members.

        // Run as a user with viewhiddengroups. Should be able to see memberships that exist in any group.
        $this->setUser($users[5]);
        $this->assertEquals([$users[1]->id], array_keys(groups_get_members($groups['all']->id, 'u.id', 'u.id')));
        $this->assertEquals([$users[1]->id, $users[2]->id],
                array_keys(groups_get_members($groups['members']->id, 'u.id', 'u.id')));
        $this->assertEquals([$users[1]->id, $users[3]->id],
                array_keys(groups_get_members($groups['own']->id, 'u.id', 'u.id')));
        $this->assertEquals([$users[1]->id, $users[4]->id],
                array_keys(groups_get_members($groups['none']->id, 'u.id', 'u.id')));
    }

    /**
     * Test groups_get_groups_members() using groups with different visibility settings.
     *
     * @covers \groups_get_groups_members()
     */
    public function test_groups_get_groups_members_with_visibility(): void {
        list($users, $groups) = $this->create_groups_with_visibilty();

        // Assign users to groups.
        $generator = $this->getDataGenerator();
        $generator->create_group_member(['groupid' => $groups['all']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['members']->id, 'userid' => $users[2]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[1]->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $users[3]->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $users[4]->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $users[1]->id]);

        $groupids = [$groups['all']->id, $groups['members']->id, $groups['own']->id, $groups['none']->id];

        $this->setUser($users[1]);
        // Can see self in group1/3, other users in group2.
        $this->assertEquals([$users[1]->id, $users[2]->id], array_keys(groups_get_groups_members($groupids, null, 'id ASC')));

        $this->setUser($users[2]);
        // Can see self in group2, user1 from group1/2.
        $this->assertEquals([$users[1]->id, $users[2]->id], array_keys(groups_get_groups_members($groupids, null, 'id ASC')));

        $this->setUser($users[3]);
        // Can see self in group3, user1 from group1.
        $this->assertEquals([$users[1]->id, $users[3]->id], array_keys(groups_get_groups_members($groupids, null, 'id ASC')));

        $this->setUser($users[4]);
        // Can see user1 from group1, cannot see self in group4.
        $this->assertEquals([$users[1]->id], array_keys(groups_get_groups_members($groupids, null, 'id ASC')));

        $this->setUser($users[5]);
        // Can see all users from all groups.
        $this->assertEquals([$users[1]->id, $users[2]->id, $users[3]->id, $users[4]->id],
                array_keys(groups_get_groups_members($groupids, null, 'id ASC')));
    }

    /**
     * Only groups with participation == true should be returned for an activity.
     *
     * @covers \groups_get_activity_allowed_groups()
     * @return void
     * @throws \coding_exception
     */
    public function test_groups_get_activity_allowed_groups(): void {
        $this->resetAfterTest(true);
        $generator = $this->getDataGenerator();

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

        // Create user.
        $user = $generator->create_user();

        // Enrol user.
        $generator->enrol_user($user->id, $course->id);

        // Create groups.
        $groups = [
            'all-p' => $generator->create_group(['courseid' => $course->id, 'visibility' => GROUPS_VISIBILITY_ALL]),
            'members-p' => $generator->create_group(['courseid' => $course->id, 'visibility' => GROUPS_VISIBILITY_MEMBERS]),
            'all-n' => $generator->create_group([
                'courseid' => $course->id,
                'visibility' => GROUPS_VISIBILITY_ALL,
                'participation' => false
            ]),
            'members-n' => $generator->create_group([
                'courseid' => $course->id,
                'visibility' => GROUPS_VISIBILITY_MEMBERS,
                'participation' => false
            ]),
            'own' => $generator->create_group(['courseid' => $course->id, 'visibility' => GROUPS_VISIBILITY_OWN]),
            'none' => $generator->create_group(['courseid' => $course->id, 'visibility' => GROUPS_VISIBILITY_NONE]),
        ];
        // Add user to all groups.
        $generator->create_group_member(['groupid' => $groups['all-p']->id, 'userid' => $user->id]);
        $generator->create_group_member(['groupid' => $groups['members-p']->id, 'userid' => $user->id]);
        $generator->create_group_member(['groupid' => $groups['all-n']->id, 'userid' => $user->id]);
        $generator->create_group_member(['groupid' => $groups['members-n']->id, 'userid' => $user->id]);
        $generator->create_group_member(['groupid' => $groups['own']->id, 'userid' => $user->id]);
        $generator->create_group_member(['groupid' => $groups['none']->id, 'userid' => $user->id]);

        $module = $generator->create_module('forum', ['course' => $course->id]);
        $cm = get_fast_modinfo($course)->get_cm($module->cmid);

        $activitygroups = groups_get_activity_allowed_groups($cm, $user->id);

        $this->assertContains((int)$groups['all-p']->id, array_keys($activitygroups));
        $this->assertContains((int)$groups['members-p']->id, array_keys($activitygroups));
        $this->assertNotContains((int)$groups['all-n']->id, array_keys($activitygroups));
        $this->assertNotContains((int)$groups['members-n']->id, array_keys($activitygroups));
        $this->assertNotContains((int)$groups['own']->id, array_keys($activitygroups));
        $this->assertNotContains((int)$groups['none']->id, array_keys($activitygroups));

    }
}

Filemanager

Name Type Size Permission Actions
analytics Folder 0777
behat Folder 0777
classes Folder 0777
content Folder 0777
context Folder 0777
db Folder 0777
event Folder 0777
external Folder 0777
fixtures Folder 0777
hook Folder 0777
hub Folder 0777
lock Folder 0777
moodlenet Folder 0777
navigation Folder 0777
oauth2 Folder 0777
other Folder 0777
output Folder 0777
performance Folder 0777
plugininfo Folder 0777
privacy Folder 0777
route Folder 0777
router Folder 0777
session Folder 0777
task Folder 0777
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accesslib_test.php File 245.63 KB 0777
adminlib_test.php File 7.42 KB 0777
admintree_test.php File 18.08 KB 0777
ajaxlib_test.php File 4.45 KB 0777
analysers_test.php File 12.71 KB 0777
antivirus_test.php File 11.98 KB 0777
attribute_helper_test.php File 8.41 KB 0777
authlib_test.php File 22.97 KB 0777
behat_lib_test.php File 3.3 KB 0777
blocklib_test.php File 36.31 KB 0777
check_test.php File 2.31 KB 0777
client_test.php File 4.32 KB 0777
collator_test.php File 12.1 KB 0777
completionlib_test.php File 92.46 KB 0777
component_test.php File 49.28 KB 0777
componentlib_test.php File 6.93 KB 0777
configonlylib_test.php File 8.95 KB 0777
content_test.php File 4.79 KB 0777
context_block_test.php File 4.17 KB 0777
context_helper_test.php File 22.28 KB 0777
context_test.php File 3.42 KB 0777
core_media_player_native_test.php File 6.44 KB 0777
core_renderer_template_exploit_test.php File 16.54 KB 0777
core_renderer_test.php File 7.57 KB 0777
core_userfeedback_test.php File 2.3 KB 0777
coverage.php File 3.27 KB 0777
cron_test.php File 6.82 KB 0777
csvclass_test.php File 5.66 KB 0777
curl_security_helper_test.php File 14.88 KB 0777
customcontext_test.php File 4.67 KB 0777
dataformat_test.php File 4.18 KB 0777
datalib_test.php File 48.97 KB 0777
datalib_update_with_unique_index_test.php File 6.12 KB 0777
date_legacy_test.php File 13.67 KB 0777
date_test.php File 30.4 KB 0777
deprecation_test.php File 15.78 KB 0777
di_test.php File 5.33 KB 0777
editorlib_test.php File 1.96 KB 0777
emoticon_manager_test.php File 4.2 KB 0777
encryption_test.php File 9.48 KB 0777
environment_test.php File 9.12 KB 0777
exporter_test.php File 16.83 KB 0777
externallib_test.php File 2.03 KB 0777
filelib_test.php File 83.89 KB 0777
filestorage_zip_archive_test.php File 2.54 KB 0777
filetypes_test.php File 10.09 KB 0777
filter_manager_test.php File 3.33 KB 0777
filterlib_test.php File 37.09 KB 0777
formatting_test.php File 26.09 KB 0777
formslib_test.php File 40.1 KB 0777
gdlib_test.php File 5.73 KB 0777
googlelib_test.php File 1.62 KB 0777
gradelib_test.php File 12.01 KB 0777
grades_external_test.php File 11.22 KB 0777
grading_external_test.php File 26.55 KB 0777
graphlib_test.php File 7.14 KB 0777
grouplib_test.php File 110.79 KB 0777
h5p_clean_orphaned_records_task_test.php File 3.17 KB 0777
html2text_test.php File 8.82 KB 0777
htmlpurifier_test.php File 23.11 KB 0777
http_client_test.php File 14.67 KB 0777
ip_utils_test.php File 19.55 KB 0777
jquery_test.php File 1.59 KB 0777
ldaplib_test.php File 17.77 KB 0777
licenselib_test.php File 11.84 KB 0777
locale_test.php File 4.96 KB 0777
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lock_test.php File 5.34 KB 0777
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messagelib_test.php File 56.44 KB 0777
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moodlelib_partial_test.php File 4.48 KB 0777
moodlelib_test.php File 239.56 KB 0777
myprofilelib_test.php File 12.2 KB 0777
navigationlib_test.php File 32.56 KB 0777
notification_test.php File 4.37 KB 0777
oauth2_test.php File 23.16 KB 0777
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outputfactories_test.php File 6.83 KB 0777
outputrenderers_test.php File 1.63 KB 0777
outputrequirementslib_test.php File 15.72 KB 0777
param_test.php File 4.11 KB 0777
pdflib_test.php File 3.21 KB 0777
persistent_test.php File 30.68 KB 0777
phpxmlrpc_test.php File 2.05 KB 0777
plugin_manager_test.php File 31.47 KB 0777
portfoliolib_test.php File 8.41 KB 0777
progress_display_test.php File 3.76 KB 0777
progress_test.php File 14.53 KB 0777
qrcode_test.php File 1.69 KB 0777
questionlib_test.php File 108.63 KB 0777
regex_test.php File 1.56 KB 0777
report_helper_test.php File 7 KB 0777
requirejs_test.php File 2.23 KB 0777
router_test.php File 3.85 KB 0777
rsslib_test.php File 7.41 KB 0777
rtlcss_test.php File 57.07 KB 0777
sample_questions.ser File 141.76 KB 0777
sample_questions.xml File 102.62 KB 0777
sample_questions_with_old_image_tag.ser File 4.85 KB 0777
sample_questions_with_old_image_tag.xml File 4.08 KB 0777
sample_questions_wrong.xml File 102.57 KB 0777
scss_test.php File 4.31 KB 0777
session_redis_cluster_test.php File 4.17 KB 0777
sessionlib_test.php File 12.37 KB 0777
setuplib_test.php File 20.21 KB 0777
statslib_test.php File 26.82 KB 0777
stored_progress_bar_test.php File 7.17 KB 0777
string_manager_standard_test.php File 10.23 KB 0777
system_clock_test.php File 2.42 KB 0777
text_test.php File 26.68 KB 0777
theme_config_test.php File 7.25 KB 0777
update_api_test.php File 6.65 KB 0777
update_checker_test.php File 10.91 KB 0777
update_code_manager_test.php File 9.12 KB 0777
update_validator_test.php File 18.32 KB 0777
upgrade_util_test.php File 5.36 KB 0777
upgradelib_test.php File 75.43 KB 0777
url_test.php File 25.48 KB 0777
user_menu_test.php File 3.83 KB 0777
user_test.php File 42.3 KB 0777
useragent_test.php File 67.06 KB 0777
weblib_format_text_test.php File 14.21 KB 0777
weblib_test.php File 42.12 KB 0777
xhprof_test.php File 10.05 KB 0777
xmlize_test.php File 2.57 KB 0777
xsendfilelib_test.php File 5 KB 0777
Filemanager