The best way to test your shop is to make an actual purchase. Before you can make a test order, you must add the "Admin Payments" plugin.
Go to Company->Settings->Payment and click "Add payment Gateway" and buy the free "Admin Payments" plugin. Do not forget to check the checkbox to make Admin Payments available in the shop and select at least one payment option (Visa, Master...).
Credit Card Number: 4111 1111 1111 1111
CVS Code: 778
Expiration date: In the future
Cardholder: Does not matter
Once the purchase completes, you can access the content.