It's done all the time. The issue becomes you found the cam for that application and it makes the other cams look like junk when they may not be.
I remember an interview with Larry Morgan years and years ago (got to meet him in 1998 and he is a funny dude...sorry for the name drop) and he said they spent the off season only testing cams.
They went through 200 different cams and a 55 gallon drum of fuel. Just testing cams!!! They didn't change the intake manifold, the headers, the ports or anything. Just the cams.
Obviously they do lash loops and moved the ICL all over the place, but like testing oils and fuels, any real testing is time consuming and very costly. If you want real results.