A sanity test or smoke test is a brief run-through of the main
functionality of a computer program or other product. It gives a measure of confidence that the system works as expected prior to a more exhaustive round of testing.
Also, the name sanity test has been used to refer to various order of magnitude and other simple rule of thumb devices applied to cross-check mathematics calculations. For example, 738square (algebra) cannot be equal to 53,874 since 3002 is 90,000; the Power (physics) output of a automobile cannot be 700 kilojoule since that is a unit of energy, not power (energy per unit time) and 918 multiplication 155 is not 142135 since 918 divides by three but the answer does not (digits do not add up to a multiple of three). Similarly, a genealogy that contains four generations spanning only thirty years, or only two generations spanning a hundred years, is probably incorrect.
