public void AddIdea_Add_Items_Test()
{
Box target = new Box();
Idea idea1 = new Idea();
Idea idea2 = new Idea();
Idea idea3 = new Idea();
Idea idea4 = null;
target.AddIdea(idea1);
target.AddIdea(idea2);
target.AddIdea(idea3);
target.AddIdea(idea4);
Assert.AreEqual(3, target.Ideas.Count);
}