Leakage test jumping

Hi

I'd like to do some experiences, by jumping the nitrogen leakage test,
with small Split units.

If I open a little the service valve and allow just a small amount of refrigerant to flow into the tubes, will it expand to something as 120PSI or more ?

Supposing I have done a good flare and connections, is this enough to correct some small leakages ?

Moises