HWUT is a tool for software tests during the development phases. The abbreviation H.W.U.T. stands for ‘Hello Worldler’s Unit Test’. As the name insinuates, the program should not demand more knowledge than what is required in order to get a ‘hello world’ program to run. It is built on a very simple principle but its applications span further than many unit test or even system test tools. HWUT relies on the test programs output and a nominal output. This way, HWUT is operating system and programming language independent. At the same time tests can be setup literally in minutes.

HWUT tests can run in two different modes. The first mode is for strict deterministic testing, where the program under test always produces the same output. Such tests are written in a very short time and do virtually not require any preliminaries. The second mode is based on temporal logic. It is appropriate to test in environments where the program behaves not strictly deterministic, e.g. in multi-threading applications. Such tests require the user to learn a small language that allows to describe rules for events. In most practical applications the quick-and-easy deterministic mode is sufficient.