Looking at the pricing it seems the only testing optional will be with the fully assembled miner.  I find this odd because most manufacturers will test a PCB assembly before fitting all the heatsinks etc to reduce the cost of rework.  They'll also use a jig to test.  I guess the issue here is that this board is hard to test without a heatsink?  Perhaps two levels of testing can be offered, a sanity test (power, trace continuity etc but no mining) and a bake in test?   Perhaps we can write some code to just mine one share and shutdown the clocks, this could be ok without a heatsink?