Did you save it first before trying the battle test? Normally when you play test, it asks you to save first, and at that point all the plugin settings you've changed are saved, and available for reading when the game launches. If you add the plugin but don't save, then it's only in memory that it knows about the plugin, and not the files on your computer, and those are what's used when you do a battle test. Saving will update them with the latest of what's in memory.
Having said that, when you do a battle test, not everything is loaded, and battles are called in a different way. So it is possible that even with saving prior to battle test, it still may not take effect. That would mean that NO plugins are effective for battle test, and I kind of find it hard to believe.
So, after saving, try the battle test again and see if it behaves differently.