Instructions are rather vague
which long test did you run?
long drive self test? - Tests all aspects of the drive. Performs limited testing of the drive media blocks. Completes in several minutes depending on drive.
long generic test? - Performs read and write test on all blocks of the flash media
fix all long? - Back up your data. Defrags the full disk. Reads and writes all data blocks; finds and replaces bad blocks. Recovery results can vary. This test can take as long at 1 hour per TB, and cannot be interrupted.
Clearly I wouldn't interrupt the Fix all but the other 2 might be safe to just stop. Close app.