....I'm wondering why you waited until JUST before your trip to order your gear if pre-trip-testing was part of your plan ? ...anyway, you're gonna have to go to a stripped-down testing plan 'B', meaning go for dry-testing....air up the BC, see if it holds 'air' OK......test out the BC power inflator (I'm assuming you do have a full scuba tank at least ?)....power up the reg, test the 'breathing' effort....listen for leaks......or write down the 'air pressure', see if the SPG reading holds steady or is losing air pressure over time..........try breathing through the reg with the air 'off', to see if the diaphragm/exhaust valves are leaking so you don't end up sucking in water while diving......power up the computer, make sure you know how to program/read it, and that it appears to be working......understand your weight loading/release system operation....inflate the BC and test all the exhaust dump valves for operation/leaks......and finally, call ahead and confirm rental gear is available on site...that's plan 'C', as it's too late to do any serious repairs/adjustments if you DO now discover a serious problem. If you are an experienced diver, you have recorded in your logbook your prior 'weighting/lead' requirements so you should be able to get close to the correct weighting required, and you can tweak your weighting as needed during your 1st or 2nd dives to get it perfected......if you are a new diver and don't have a clue about your weighting, your destination DM can give you good guidance on proper weighting and you can dial that in pretty quickly in the 1st dive or two.