They're not called that, but they do exist. I recently went through a full day's testing for issues relating to autism and a number of the tests related to abil

They're not called that, but they do exist. I recently went through a full day's testing for issues relating to autism and a number of the tests related to ability to hold focus rather than skill, per se. One I recall vividly was basically a page full of weird symbols and a "key" at the top mapping symbols to numbers. I had to go through the whole page converting the entire page and various elements of my performance (variance of speed, attention, etc.) were measured during the task. This does not really correlate to what I'd consider focus or "flow" during typical programming tasks, however, but it did try my patience! :-)