When you get a new dog are there certain tests they need to pass?

Sigh. We got a puppers. He’s a boxer mix. We named him Copper. We liked him because he was just chill at the humane society, in spite of the pandemonium all around.
So we brought him home.
We feed him. Test one: Rick played in his food as he was eating. He didn’t react at all and that is good.
Test 2: we were hanging out outside on Rick’s Dad’s back patio. He has 3 unfenced acres.
Rick has cousins up the road and one of their Shelte dogs came across the property . Copper saw him and watched him alertly and curiously but didn’t move and didn’t bark. Good sign.
Last test will come tomorrow. We’ve been invited to his cousin’s for a cookout. Tons of kids and other dogs.
They said we can bring Copper, no problem. So that will be the final test and then he will be ours always and forever!

BTW we paid $45 and in return we got a doggo who is neutered, chipped and shot. Helluva deal!