public void Pop_EmptyStack_ThrowsException()
{
var stack = new MyStack <int>();
Assert.ThrowsException <InvalidOperationException>(() =>
{
stack.Pop();
});
}
public void Peek_PushTwoItemsAndPop_ReturnsHeadElement()
{
var stack = new MyStack <int>();
stack.Push(1);
stack.Push(2);
stack.Pop();
Assert.AreEqual(1, stack.Peek());
}
public void It_Should_Throw_InvalidOperationException_When_PoppingAnEmptyStack()
{
//arrange
var stack = new MyStack();
//act
Action actual = () => stack.Pop();
//assert
var exception = Assert.Throws <InvalidOperationException>(actual);
Assert.Equal("Cannot remove item from an empty stack", exception.Message);
}
public void It_Should_RemoveAnObject_WhenPopped()
{
//arrange
var stack = new MyStack();
stack.Push(1);
stack.Push(2);
//act
stack.Pop();
//assert
Assert.Single(stack.Stack);
}
public void It_Should_ReturnLastObject_WhenPopped()
{
//arrange
var stack = new MyStack();
stack.Push(1);
stack.Push(2);
stack.Push(3);
//act
var poppedItem = stack.Pop();
//assert
Assert.StrictEqual(3, poppedItem);
}