Bare Board Testing or Electrical Testing of the non populated circuits board is a test that ensures the working of the circuit of your PCB by testing it to the electrical footprint of your design. It is standard in the PCB production process of Eurocircuits with exception of the single layer boards where it is optional.
At Eurocircuits we test all bare boards with flying probe testers, avoiding long set up times and high tooling costs for adapters. We test for shorts and opens.
How this is done in our production can be viewed here