I've seen people panic in coding interviews I used to have a set of unit tests and asked the candidate to make them pass and I thought this was a good system.

I've seen people panic in coding interviews I used to have a set of unit tests and asked the candidate to make them pass and I thought this was a good system. We have a senior dev that got something wrong early on, started getting more nervous, refused help as it was a simple problem, got more nervous and flaked out completely. On the other hand we had people that were so unfamiliar with coding that this was a good test to weed them out.