Absolutely not... I made that mistake when I was 18, I let this young family (with a young newborn) take my '72 Chevelle out for a test drive.
They left their POS station wagon there at the house, then took off with it. I never thought anything of it, but I was waiting for a while, and they never came back.
So I hopped on my sportbike and quickly booted around the neighborhood, and I found them, pulled over with it, while quickly going over a map. They intended on stealing the car, and were trying to drive off with it, only to get lost in the neighborhood.
The police were involved and everything, it was a big mess.... Turns out the car they just bought (for $200) had no registration or insurance and had full intentions of leaving it at my place, since it was a stolen plate and everything. Big charges were laid, both got fucked over royally for that stunt, which made me quite happy.
Yeah, that was the last time I ever let anybody touch anything I owned, unless I knew them extremely well. Now I'd never, ever let anybody take anything I own for a test drive on their own, unless its was a motorcycle, whereas I dont want to ride passenger exactly. Only then, I get their full insurance for their car/truck, their keys for it, license & registration, after verifying that it is in fact them for their drivers license. That way? chances are if they do want to take off with the bike, I have something of more value, and all the info I need to take to the police.
Even then.... Im still leery. Long story short, dont ever make the same mistake I did.
"The music business is a cruel and shallow money trench, a long plastic hallway where thieves and pimps run free, and good men die like dogs. There's also a negative side"