I had a friend who would "test" girlfriends by taking them camping for a few days.
Camping or other intense travel that raises the level of discomfort (no running water/flush toilets/electricity/internet/air conditioning etc.) reveals someone's true nature very quickly. You'll see whether they get cranky or stay optimistic, whether they're disorganized or not, whether they carry more or less of their fair share of the load, whether they get on your nerves, etc.
Camping or other intense travel that raises the level of discomfort (no running water/flush toilets/electricity/internet/air conditioning etc.) reveals someone's true nature very quickly. You'll see whether they get cranky or stay optimistic, whether they're disorganized or not, whether they carry more or less of their fair share of the load, whether they get on your nerves, etc.