If you use buttons: press and hold B3 until the LCD displays “Run a Program, click B3 to list”. Then click B3, the first program you see (0. Test (1 min)) is the test program. Press and hold B3 to start it.
If you use the mobile app / UI, click ‘Run-Once program’, then in the drop-down list, select ‘Test All Station’, then ‘Submit’.