For all these types of coding interviews I think that the company should state up front how they evaluate it. Is that clicking keyboard in the background someon

For all these types of coding interviews I think that the company should state up front how they evaluate it. Is that clicking keyboard in the background someone typing in the code to run it and see if it works? Are they looking for clear communications, do they want you to just solve the problem or is it more important to lay out that whiteboard code exactly the way you would in a source code file? And what about unit tests? If they give you a problem to code on a whiteboard, do they want to see TDD red green refactor cycles? And is this the only problem they want you to work on in the hour or is there another one coming when you finish?