[feature/dic] Fix test suite for dic-powered cron

PHPBB3-10739

tests/cron/tasks/simple_ready.php

@@ -2,6 +2,11 @@
 
 class phpbb_cron_task_core_simple_ready extends phpbb_cron_task_base
 {
+	public function get_name()
+	{
+		return get_class($this);
+	}
+
 	public function run()
 	{
 	}