Bogus Gateway is a payment provider that any store can use to create test orders. While Bogus Gateway is set up, every order that you create is a test order.
By placing a test order, you can make sure that your checkout process and settings for order processing, inventory, shipping, email notifications, and taxes are all correct. You aren't charged for a test order. You should place at least one test order during your store setup or whenever you make changes to your payment settings.