As far as I can see they never demonstrated any run dry capability. They demonstrated run for 3 hours at reduced oil pressure and reduced oil capacity at one would assume cruise power settings. It was mentioned earlier that if failed the 30 minute test at cruise power with zero oil ,certification was achieved as they persuaded the FAA that complete loss of oil was an extremely unlikely occurance. The test is very specific , you start the test at full cruise power and then drain all oil and start the clock when the pressure is indicated at Zero.( perception of lube system failure )
far 29.927 quote below.
(c) Lubrication system failure. For lubrication systems required for proper operation of rotor drive systems, the following apply:
(1) Category A. Unless such failures are extremely remote, it must be shown by test that any failure which results in loss of lubricant in any normal use lubrication system will not prevent continued safe operation, although not necessarily without damage, at a torque and rotational speed prescribed by the applicant for continued flight, for at least 30 minutes after perception by the flightcrew of the lubrication system failure or loss of lubricant