Yes! You can stop a test at any time. Any unused testers will be automatically returned to your account.
Open the "Testers" tab in your test
Click on the ellipsis and click "Stop testing."
Example: If you requested 7 videos but only received 6, stopping the test will refund the remaining 1 tester back into your account.
Please note that if a tester has already begun recording, you cannot stop them while they are in the middle of completing your test.