My dealership offers test rides on used bikes and a select number of new "demo" bikes in stock. The odds are better of getting a test ride if you arrive on a motorcycle, carry a valid license with the proper endorsement, and bring your own helmet. The dealership sees you have the ability to ride, can operate a motorcycle, and can then proceed with a test ride. We have actually had someone wanting a test ride without having ridden before.
Not all dealerships offer test rides due to insurance restrictions—again, another difference between here and Europe—and inventory availability. So you know, the new motorcycles we have on our sales floor aren't serviced, and it can take up to three hours to get one ready to ride. Also, with certain models, we may have only one in stock. We're going to be careful with it.
Not every dealer offers loaner bikes while you wait on service. The reasons can range from insurance restrictions, inventory size, or weather conditions. Putting the customer on a newer "step-up" model to entice you to buy is one reason dealers offer a loaner while you wait, and it often works well when selling new bikes. But not every dealer can do this. It would be great if they did, but it's the nature of the business that they don't.