Is there any way to test what's in a fake cart?

I have a cart that I'm like 95% sure is fake, but I've been kinda desperate so I still hit it and got stoned asf. Got it from a guy I don't really know and the box looked off. I'm just worried about what I'm smoking if it's vitamin e or something. Is there any way to test it at home? The oil is thick, and bubbles move EXTREMELY slowly. It's also a watermelon flavor which is ass but whatever.