How can I stub rand in minitest?

I've tried Random.stub :rand, 1 do ... end and Kernel.stub :rand, 1 do ... end and Class.stub :rand, 1 do ... end (because when I run self.class where I run rand I get Class). I've also tried replacing rand(2) with Random.rand(2) but it doesn't help.

So how do I stub out rand?