The Bin class.

A class which performs a unit test of the Bin class. The unit test should create several instances of Outcome, two instances of Bin and establish that Bins can be constructed from the Outcomes.

Programmers who are new to OO techniques are sometimes confused when reusing individual Outcome instances. This unit test is a good place to examine the ways in which object references are shared. A single Outcome object can be referenced by several Bins. We will make increasing use of this in later sections.