Jeremy,
Was waiting for the clarification. Contrary to Pilotage's reply, the answer in North America is "yes". Provided the rigs & test facilities you use are correctly configured to a traceable standard (and this is a very big proviso) you can use those test results for certification. In some cases, such as proving the logic for a warning is correct, it is much better (and safer) to do this on an EICAS test rig than on the aircraft.
The process is not in the regs as such but has been enshrined in SAE ARP 4754, which tries to ensure the original system requirements are met by marrying each one with a test result or other engineering finding - essentially the same as the Design Compliance Report but over both the equipment vendors and airframer.
Last edited by ICT_SLB; 5th Jan 2013 at 03:20.