It's testable, I agree. However as a left-handed person where my dominant side is the left...I always go left if I can.
Interestingly, though admittedly this is purely my anecdote so take this as such, this translates to driving too. Unknown place, just driving for fun, reach a t-junction and have to choose? To me left = "towards where you know" and right = "going further out". Even if that's not actually the case, that's just how my mind sees it at first glance. Wonder if that's also looked at, and also if it's affected by location (I'm in the UK, so would drive on the left).