ABSTRACT
In Chapter 3, we saw that a function maps values from one set (its domain) to values in another set (its range) and that the domain and range can be cross products of other sets. Any program can be considered to be a function in the sense that program inputs form its domain and program outputs form its range. In this and the next two chapters, we examine how to use knowledge of the functional nature of a program to identify test cases for the program. Input domain testing (also called “boundary value testing”) is the best-known specification-based testing technique. Historically, this form of testing has focused on the input domain; however, it is often a good supplement to apply many of these techniques to develop range-based test cases.
