public void TestPush()
{
IStack <int> sut = new SinglyLinkedListStack <int>();
Assert.Throws <IndexOutOfRangeException>(() => sut.Top());
sut.Push(3);
Assert.Equal(3, sut.Top());
sut.Push(4);
sut.Push(5);
Assert.Equal(5, sut.Top());
}
public void TestPop()
{
IStack <int> sut = new SinglyLinkedListStack <int>();
sut.Push(1);
sut.Push(2);
sut.Push(3);
sut.Push(4);
Assert.Equal(4, sut.Pop());
Assert.Equal(3, sut.Top());
sut.Pop();
sut.Pop();
Assert.Equal(1, sut.Pop());
Assert.True(sut.IsEmpty());
}