public void PeekOrDefault()
{
Stack <int> stack = new Stack <int>();
Assert.AreEqual(0, StackUtility.PeekOrDefault(stack));
stack.Push(3);
Assert.AreEqual(3, StackUtility.PeekOrDefault(stack));
stack.Pop();
Assert.AreEqual(0, StackUtility.PeekOrDefault(stack));
}
public void PeekOrDefaultWithDefault()
{
var stack = new Stack <int>();
Assert.AreEqual(1, StackUtility.PeekOrDefault(stack, 1));
stack.Push(3);
Assert.AreEqual(3, StackUtility.PeekOrDefault(stack, 1));
stack.Pop();
Assert.AreEqual(1, StackUtility.PeekOrDefault(stack, 1));
}