My cats make eye contact with me through my mirror, do they understand it?

Hi all,

I have two Bengal housecats that both seem very intelligent (I'm biased, obviously.) The girl in particular will stand behind me watching me through the mirror. I picked her up and held her near the mirror and she seemed disinterested at most. She'd occasionally look at herself, but mostly she looked into my eyes through the mirror, with her usual "put me down" look.

I don't know if these are all the requirements for passing a mirror test, but both of my cats seem to treat mirrors as walls they can look at the room through. Sorry if this is a common question, but I'm just curious if this is frequent in cats or not.

Thanks!