Testing the oil pump is fairly simple. I generally run a bit of pre-mix just for insurance while I do it. Like you said, better to foul a plug than an engine.
Just disconnect the tube that goes between the pump and intake. On my 250 engines, the tube goes into the intake just after the carb. Start the engine and hold the pump control all the way open while the engine idles. You will see just a few drops of oil at the end of the tube if it is working.
Mine: 2018 Sportsman 850SP - 26" Bear Claw HTRs on OEM steel wheels(I really don't like the Aluminum ones)
Polaris Hand warmers, Mirrors.
Hers: 2019 Sportsman 450. 26" Bear Claw HTRs on Moose 427X Wheels.
2007 Sportsman 500 EFI, Polaris Winch, 25" Bear Claws QSC Clutch Kit, Hand Warmers
2001 Magnum 325 MOSE 12" rear wheel conversion. 25" Sedona Coyote tires
2017 Polaris Ranger 1000XP - Roof and front glass
2018 Kawasaki KLR650
2001 Magnum 325 Warn winch and Moose 60" plow-Sent to Daughter and Son-In-Law since his blew up
SOLD 2004 Sportsman 600 Twin