Using the "win game" button in the practise tool instantly wins you the game, but it also pops up some text above your head.
"My only way to see victory"
Little bit savage there Rito....
Edit: Apparently it says "My only way see that victory screen"
I'm actually glad they added this function. Previously when I tested something in Practice Tool and needed the replay file, I'd just FF to kill a Nexus the fastest - which isn't possible before 15 min and also litters the match history with disheartening defeats you can only see yourself!
Now with this new cheat spell, my Practice Tool winrate rose dramatically! Not the change I was looking for, per-se, but I mean, still appreciated. Small but oho.
I was going to add a "Lose the Game" button as well that also flamed the player, but couldn't convince anyone that a joke was worth the effort. Oh well...