A black box test of a class is a program that tests the correctness of a class without directly examining the private instance variables of the class. You can imagine that the private instance variables are inside an opaque black box where they cannot be seen, so all testing must occur only through activating the public methods.

Write a noninteractive black box test program for the IntArrayBag class. Make sure you test the boundary values, such as an empty bag, a bag with just one element, and a full bag.