Engine test stand - Trans hookup?

I plan to do a cam break-in and leak check on an engine stand. With the trans hooked up and in neutral, would it be best to have a trans cooler hooked up or is it superfluous at that time?

Are there any tests that can or should be done on the transmission on an engine test stand? This will be a 512 stroker and 727 trans. I have not opened the trans yet to rebuild, but I will be putting a trans-go tf-2 kit in it.