Is there any way to test a breaker?

I have a 30a 110 breaker for my camper plug in, if you have 10 guage wire, you may be able to find a 30a 110 breaker for your box! Not every company has them, I know the "homeline" Square D doesn't!!

We had 2 slushy machines hooked up there for Nellas grad party! They have a very high amp draw on the cooling compressor, never popped the breaker!!!