Ability to test drive vehicles from the warehouse

As of now, the only way for a potential customer to test drive a vehicle they are interested in is if the dealership has already spent the money to buy it and have it in stock. This is very inconveniant not only as the dealership but the customer aswell. If there was a way to test drive a vehicle without requiring a dealership to have to spend the money to buy it, that would improve the dealership exponentially due to people being able to assure their choices rather than buying a vehicle and realizing they hate it.