Welcome. Unfortunately, this is the STD forum -- as the notice at the top says, it is "intended only for questions and support pertaining to sexually transmitted diseases other than HIV/AIDS", which are welcome on the HIV Prevention and Safe Sex forum.
Sharing razors is one of those supposed HIV transmission risks that have rarely if ever come true. Although theoretically it could occur, to my knowledge there are no reports of HIV transmission via shared razors. And unless your roommate is at high risk (gay man, injection drug user, etc), it is of course unlikely he is infected. That said, I recommend you not share razors. Given your apparently inflated fears of HIV (based on both this question and the one not long ago on the HIV international forum), why put yourself through the anxiety? It seems no big deal, and not a lot of money, to invest in your own razor.
Bottom line: no risk, no need for HIV testing.
Because it's the wrong forum, there won't be any follow-up comments or discussion. But don't worry about it.
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