Currently, the best way to test your donation is to make a small donation to your organization on your campaign form. Afterward, you can refund the test donation from your Donations page. Locate the test donation, and click on the transaction ID. Then, you'll see the refund button in the top right corner.
After the refund, the test donation will be removed from your donation total. Please note that there may be a small Stripe fee associated with refunds.
Currently, it is not possible to use Stripe's test card details with Donorbox.org to send test donations.