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A pressure test is simply plugging the gas pipe at each end and putting about 15 lbs of air pressure in the line. An attached gauge is installed and the inspector comes out to read it once its set and under pressure and comes back next day and reads it again. No pressure drop, no issue.
Also if the gas pipe is entirely exposed and is not being buried behind a wall, some inspectors will approve without pressure test. In any regards its simple. We use nitrogen when we test as it does not change pressure with air temps. Compressed air goes higher in pressure when it warms out.