public void Peek_PushTwoItems_ReturnsHeadItem()
{
var stack = new NodeStack <int>();
stack.Push(1);
stack.Push(2);
Assert.AreEqual(2, stack.Peek());
}
public void Count_PushOneItem_ReturnsOne()
{
var stack = new NodeStack <int>();
stack.Push(1);
Assert.AreEqual(1, stack.Count);
Assert.IsFalse(stack.IsEmpty);
}
public void Pop_EmptyStack_ThrowsException()
{
var stack = new NodeStack <int>();
Assert.Throws <InvalidOperationException>(() =>
{
stack.Pop();
});
}
public void Peek_PushTwoItemAndPop_ReturnsHeadElement()
{
var stack = new NodeStack <int>();
stack.Push(1);
stack.Push(2);
stack.Pop();
Assert.AreEqual(1, stack.Peek());
}
public void IsEmpty_EmptyStack_RetrunsTrue()
{
var stack = new NodeStack <int>();
Assert.IsTrue(stack.IsEmpty);
}
