public void noEstaVacioCuandoContieneElementos()
{
Stack stack = new Stack();
stack.Push(1);
bool isEmpty = stack.IsEmpty;
Assert.IsFalse(isEmpty);
}
public void Test()
{
Stack stack = new Stack();
Assert.IsTrue(stack.IsEmpty); //Test behaviour N°1
stack.Push(1);
Assert.IsFalse(stack.IsEmpty); //Test behaviour N°2
Assert.AreEqual(1, stack.Pop()); //Test behaviour N°3
}