Supermarket Pricing Example

Program testing:

An important technique in testing a program is to test all kinds of input

The term kind is vague but in practice it is often easy to decide what

kinds of input a program deals with

In our program there are two main kinds of input:

input that uses the low markup

and

input that uses the high markup

Hence we should test at least one value in each range

Also it’s a good idea to test the boundary value 7 (boundary values

are input values where the program changes behavior)