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        parent::setUpBeforeClass();

    /**

     * Test for adhoc task cleanup.

     *

     * @covers \core\task\manager::cleanup_metadata()

     */

    public function test_adhoc_cleanup_metadata(): void {

        global $DB;

        $this->resetAfterTest(true);

        $clock = $this->mock_clock_with_frozen();

        // Specify lock factory to avoid previously mentioned issues with Postgres locks.

        set_config('lock_factory', '\core\lock\db_record_lock_factory');

        // Disable all scheduled tasks except the cleanup task.

        $classname = 'core\task\task_lock_cleanup_task';

        $DB->set_field_select('task_scheduled', 'disabled', 1, 'classname != ?', ["\\$classname"]);

        $DB->set_field('task_scheduled', 'nextruntime', 1, ['classname' => "\\$classname"]);

        // Create an adhoc task.

        $task = new adhoc_test_task();

        $task->set_next_run_time($clock->time() - MINSECS);

        // Queue and start the adhoc task.

        manager::queue_adhoc_task($task);

        $task = manager::get_next_adhoc_task($clock->time());

        manager::adhoc_task_starting($task);

        // Release the lock to simulate an adhoc task that has been destroyed but hasn't been cleaned up.

        $task->get_lock()->release();

        $this->assertCount(1, manager::get_running_tasks());

        // Run the cleanup scheduled task one hour later.

        $clock->bump(HOURSECS);

        $cleanuptask = manager::get_next_scheduled_task($clock->time());

        manager::scheduled_task_starting($cleanuptask);

        logmanager::start_logging($cleanuptask);

        $this->assertCount(2, manager::get_running_tasks());

        $cleanuptask->execute();

        // Confirm the task has been cleaned up.

        $this->assertCount(1, manager::get_running_tasks());

        // Check the task log hasn't been finalised for the cleanup task.

        $record = $DB->get_record('task_log', ['classname' => $classname]);

        $this->assertEmpty($record);

        // Now complete the task and make sure it was successful (0 = success, 1 = fail).

        manager::scheduled_task_complete($cleanuptask);

        $record = $DB->get_record('task_log', ['classname' => $classname]);

        $this->assertEquals(0, $record->result);

    }

    /**

     * Test for scheduled task cleanup.

     *

     * @covers \core\task\manager::cleanup_metadata()

     */

    public function test_scheduled_cleanup_metadata(): void {

        global $DB;

        $this->resetAfterTest(true);

        $clock = $this->mock_clock_with_frozen();

        // Specify lock factory to avoid previously mentioned issues with Postgres locks.

        set_config('lock_factory', '\core\lock\db_record_lock_factory');

        // Disable all scheduled tasks except the cleanup task.

        $classname = 'core\task\task_lock_cleanup_task';

        $DB->set_field_select('task_scheduled', 'disabled', 1, 'classname != ?', ["\\$classname"]);

        $DB->set_field('task_scheduled', 'nextruntime', $clock->time() + MINSECS, ['classname' => "\\$classname"]);

        // Create a new scheduled task.

        $task = new scheduled_test_task();

        $task->set_next_run_time($clock->time() - MINSECS);

        // Insert and start the test scheduled task.

        $DB->insert_record('task_scheduled', manager::record_from_scheduled_task($task));

        $task = manager::get_next_scheduled_task($clock->time());

        manager::scheduled_task_starting($task);

        // Release the lock to simulate a scheduled task that has been destroyed but hasn't been cleaned up.

        $task->get_lock()->release();

        $this->assertCount(1, manager::get_running_tasks());

        // Run the cleanup scheduled task one hour later.

        $clock->bump(HOURSECS);

        $cleanuptask = manager::get_next_scheduled_task($clock->time());

        manager::scheduled_task_starting($cleanuptask);

        logmanager::start_logging($cleanuptask);

        $this->assertCount(2, manager::get_running_tasks());

        $cleanuptask->execute();

        // Confirm the task has been cleaned up.

        $this->assertCount(1, manager::get_running_tasks());

        // Check the task log hasn't been finalised for the cleanup task.

        $record = $DB->get_record('task_log', ['classname' => $classname]);

        $this->assertEmpty($record);

        // Now complete the task and make sure it was successful (0 = success, 1 = fail).

        manager::scheduled_task_complete($cleanuptask);

        $record = $DB->get_record('task_log', ['classname' => $classname]);

        $this->assertEquals(0, $record->result);

    }