3 Way faucet: How do avoid Leaking Water Before Ship out

Most buyer are afraid of their 3 way faucet quality, espeically, leaking water problem, and I think, many people should meet this  terrible trouble in living about their faucet. actually,

How to avoid faucet leaking water when produce it is a main problem for each faucet factory face problem, and have to deal with it.

How do avoid 3 way faucet leaking water before ship out to buyer is a main problem for DOGO FAUCET, Actually this is a crisis defect, have to find and solve before ship out, so we have to testing each 3 way faucet with high pressure water, about 10 kgs pressure, and low pressure water, about 0.5kg, then by high pressure air.

Below video is ours testing for reference