I think you need to read the original question. Doing a QA at the same time as a skills test? What the candidate had to say after the test to the company is air enough and as the way it works with most companies, ours included.
But doing one at the same time as some sort of formal process is not acceptable in my opinion. We are there to do one job. I think trying to do two things at the same time open both the examiner in candidate to problems.
What happens if we have to fail the candidate?