how do i test that an electrical appliance won't electrocute me?

how do i test that that an electrical appliance won't electrocute me?

I have a cheap electric oven cooker. metal on the outside. i'd rather
be sure it's safe before turning it on and touching it.. Or finding
out a bad way. It's not the heat that bothers me. It's the possibility
of getting electrocuted.

if it helps, i'll mention that i have a multimeter.

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