public void OrderedSteps_ShouldReturnedOrderedBySortKey()
        {
            var steps = _dutWith3Steps.OrderedSteps().ToList();

            Assert.AreEqual(_stepA, steps.ElementAt(0));
            Assert.AreEqual(_stepB, steps.ElementAt(1));
            Assert.AreEqual(_stepC, steps.ElementAt(2));
        }