It got me wondering - do NASA, ESA, or other agencies have a standard test protocol? And could someone post a short description of it?
Pressure tests are done on-orbit as part of the EMU CHECKOUT procedure, and during airlock depressurization prior to extra-vehicular activity (EVA).
During the EMU CHECKOUT procedure, the suit is pressurized to a delta pressure of 4.3 psia (its normal working pressure) and the suit caution and warning system monitors for a drop in pressure.
During the airlock depressurization prior to an EVA, the depressurization is halted when the airlock pressure reaches 5 psia, and again, the suit caution and warning system monitors for a drop in pressure.
Source: the shuttle-era EVA checklist is online here.