Inspiration for this Testometer test came from the blog ( Boundary Value Testing at WHET4 ). You can find link to this blog in the blog section. Link is not present here, as it will be interesting to do this exercise first and read blog later. This exercise gives us very good indication on how powerful boundary value tests can be and how little we use them. Mostly we use or think of boundary value analysis for integer inputs, this test gives you a chance to think differently.

This test also makes you think about the concept of powerful tests. Time is limited, so how best you can test in a given time and situation.

Lets state the problem now, you have a textbox and you need to write input in this. There are only two valid input values for this textbox (ON and OFF). You need to come up with the test cases which can expose some different kind of boundaries.. give it a try.