Provide a unit test class for the Counter class in Section 3.1.

Data from section 3.1

In Chapter 1, you learned how to use objects from existing classes. In this chapter, you will start implementing your own classes. We begin with a very simple example that shows you how objects store their data, and how methods access the data of an object. Our first example is a class that models a tally counter, a mechanical device that is used to count peo ple—for example, to find out how many people attend a concert or board a bus (see Figure 1).

Figure 1

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