I would suggest letting the welder supply his own electrode to avoid the problem of; "That's not the electrode I'm used to using, it runs differently from what I normally use."
I haven't supplied electrode or welding machines for nearly twenty years. It eliminates soooo many headaches and I don't have to listen to the whining, crying, and excuses why they didn't pass the test. About the only thing I insist on is that the E7018 be in an unopened can. Other than that, they can use a welder with four cylinder engine, firing on two cylinders if they want to. It's their money, they can spend it as they see fit. If they fail the test, they have no one to blame but themselves.
I don't even provide a place for them to test. They make the arrangements and I show up to witness the test. They can weld their test plates in their kitchen, basement, garage, shop, or under the old Oak tree in the back of the house in 10 degree weather with the wind howling if they want to.
What welding procedure are you going to use?
"Welding procedure? I don't need no stinkin welding procedure!"
"Yes you do." They provide the parameters and I write a prequalified WPS on the spot for them to follow.
"Do you have a chipping hammer?
"Chipping hammer? I don't need no stinkin chipping hammer, this is multipass electrode!" (Yes, it did happen that way and no, he didn't pass.)
"OK buddy, where the money so we can start this side show!"
Best regards - Al