public void ReturnInt_AttachRemoveCustomersCountIs3()
{
Item item = new Toy();
Customer Josh = (Customer)item.Attach(new Customer("Josh"));
Customer John = (Customer)item.Attach(new Customer("John"));
Customer Ben = (Customer)item.Attach(new Customer("Ben"));
Customer Jenna = (Customer)item.Attach(new Customer("Jenna"));
Customer Christine = (Customer)item.Attach(new Customer("Christine"));
item.Detach(Josh);
item.Detach(Jenna);
int result = item.CustomerCount;
result.Should().Be(3);
}
