silverstripe-framework/tasks/CleanupTestDatabasesTask.php

<?php
/**
 * Cleans up leftover databases from aborted test executions (starting with ss_tmpdb)
 * Task is restricted to users with administrator rights or running through CLI.
 *
 * @package framework
 * @subpackage tasks
 */
class CleanupTestDatabasesTask extends BuildTask {
	protected $title = 'Deletes all temporary test databases';

	protected $description = 'Cleans up leftover databases from aborted test executions (starting with ss_tmpdb)';

	public function run($request) {
		if(!Permission::check('ADMIN') && !Director::is_cli()) {
			$response = Security::permissionFailure($this);
			if($response) {
				$response->output();
			}
			die;
		}

		SapphireTest::delete_all_temp_dbs();
	}

}