public void Push_Add2Numbers_Returns2Count()
{
BusinessLib.Fundamentals.Stack <int> stack = new BusinessLib.Fundamentals.Stack <int>();
stack.Push(1);
stack.Push(3);
Assert.That(stack.Count, Is.EqualTo(2));
}
public void Pop_PopLastItem_ItemIsCorrectAndStackIsDecreased()
{
BusinessLib.Fundamentals.Stack <int> stack = new BusinessLib.Fundamentals.Stack <int>();
stack.Push(1);
stack.Push(3);
stack.Push(4);
Assert.That(stack.Count, Is.EqualTo(3));
var result = stack.Pop();
Assert.That(result, Is.EqualTo(4));
Assert.That(stack.Count, Is.EqualTo(2));
}
public void Peek_AddItemsToStack_PeeksLastItem()
{
BusinessLib.Fundamentals.Stack <int> stack = new BusinessLib.Fundamentals.Stack <int>();
stack.Push(1);
stack.Push(3);
stack.Push(4);
Assert.That(stack.Count, Is.EqualTo(3));
var result = stack.Peek();
Assert.That(result, Is.EqualTo(4));
Assert.That(stack.Count, Is.EqualTo(3));
}
public void Pop_EmptyStack_ThrowsInvalidOperationException()
{
var stack = new BusinessLib.Fundamentals.Stack <string>();
Assert.That(() => stack.Pop(), Throws.InvalidOperationException);
}
public void Push_ArgIsNull_ThrowsArgNullException()
{
BusinessLib.Fundamentals.Stack <string> stack = new BusinessLib.Fundamentals.Stack <string>();
Assert.That(() => stack.Push(null), Throws.ArgumentNullException);
}
