Tests don’t tell you anything.
To tell if you like someone, often you feel nervous (picture butterflies in your stomach) around them, and you seriously wanna hug ‘em and maybe even kiss them.
As for how to stop liking someone, you should try to think of other stuff (maybe cool moments from your favorite video game or board game). Or get a song stuck in your head.
The above doesn’t always work though (at least for me). If it doesn’t work, game over for you.