public void Stack_Peek_ThrowsExceptionIfStackIsEmpty()
{
Stack stack = new Stack();
stack.Peek();
}
public void Stack_Peek_ReturnsLastAddedItem()
{
Stack stack = new Stack();
String lastStackItemValue = "Last item value";
stack.Push("First item");
stack.Push("Second item");
stack.Push(lastStackItemValue);
String peekValue = stack.Peek();
Assert.AreEqual(lastStackItemValue, peekValue);
}
public void Stack_Peek_ThrowsExceptionIfPreviouslyPopulatedStackIsEmpty()
{
Stack stack = new Stack();
stack.Push("Some data");
stack.Push("More data");
stack.Pop();
stack.Pop();
stack.Peek();
}
public void Stack_Peek_DoesntRemoveNode()
{
Stack stack = new Stack();
stack.Push("First Item");
stack.Push("Second Item");
int countBeforePeeking = stack.Count();
stack.Peek();
int countAfterPeeking = stack.Count();
Assert.AreEqual(countBeforePeeking, countAfterPeeking);
}
