they will probly tell you to keepthe door open but they want watch it come out of your penis but you could try to make a fake dick just in case
step one get a realalistic dildo and send a rod through it
step two get a bag and attach it it to a hose and send the hose through the dildo
step three get some hand warmers and keep that pee warm until the test and dont forget to find a way to cap the dildo until use