How to test QFN DFN components?
Get a small piece of phenolic pcb material and carve a "+" in it with a sharp knife. De-burr with a fine file. Solder the part with paste and hot air or wire solder and an iron.  Solder wires to the corners.

For more complicated parts if you expect to need to evaluate them before designing them in, keep breakouts for common footprints on hand.

With care to hand apply the right amount in a general area, and occasional cleanup you do not need a solder stencil for QFN ic's - if anything, it's more important for tiny passives, but only as a time saver.