When moving into production mode, we do not recommend running any test data there as those cannot be deleted due to auditing purposes. What we recommend is signing up for another sandbox site here so that when you move your current site into production mode this account can be used to test your implementations. You will want to sign up for a new account using an email address that is not associated with any other Recurly sites.
Then, you can also invite users as needed to access the site. Additionally, you can add your primary email address as a user on the site so that when you log in there is a dropdown menu at the top left-hand side with all sites that are associated with that primary email to allow you to easily switch back and forth. We also provide our test credentials here that you can use in your sandbox site to test your desired scenarios.