It's very cruel
ALTHOUGH, I got this mentioned to me in health class..
There was a testing on rats to see how people get addicted to crack cocaine and drugs. And they test drugs on them to see how it turns out
You really wouldn't want that on a human right? Take 10 humans, tell them "HEY I GONNA GET YOU HIGH ON SOME COCAINE AND YOU HAVE UNLIMITED AMOUNTS AND THEN WE GONNA SEE WHAT HAPPENS TO UUU"
Of course not, it's cruel when they test on more knowledgable animals like rabbits, cats, dogs, etc.
I'm not so sure about rats though...
The only time I think it's okay is if it's for medical reasons. Not makeup reasons. If any makeup brand "NEEDS" to test on animals, it's probably bad for your face.