I know it does a very short test, but they dont spin up audible on boot up.
It is quite silent.
In fact after reconnecting battery, it showed a Dell screen I have never seen, and then said fans were ok
And I never noticed them spin even once. So maybe just a short electrical test.
One fan was very noisy, grabbing, shrieking, catching on it's shaft. growling. I realized once I was hearing it spin up and then shrieking to an instant stop and then spinning again noisily, I had to oil them. It had been loud for maybe a month., but yesterday it got really bad.
So I wanted a long test of them spinning fast, and the stress test verified they are good. Still good today. I saw a vid on youtube of this very laptop and how to do it.
Here it is. I have same laptop he has. And had started taking out many screws, then thought better to oil fan without total disassembly, so went looking and found out how.