trouble with that test is they can fail intermittent, or cut out when they get hot!
fuel pump relay easy to diagnose, get a chunky piece of wire and pop it between the 2 large relay pin holes in the fusebox, this will bring fuel pump on constant. drive car for a bit and if it still does it then you know pump relay isnt to blame.
ecu relay not so easy as you have to bridge 3 pins together rather than 2