public void move_to_top()
{
var leaf = new StepLeaf();
IStep step0 = leaf.AddNewStep();
IStep step1 = leaf.AddNewStep();
IStep step2 = leaf.AddNewStep();
IStep step3 = leaf.AddNewStep();
leaf.MoveToTop(step3);
leaf.AllSteps()[0].ShouldBeTheSameAs(step3);
leaf.AllSteps()[1].ShouldBeTheSameAs(step0);
leaf.AllSteps()[2].ShouldBeTheSameAs(step1);
leaf.AllSteps()[3].ShouldBeTheSameAs(step2);
leaf.MoveToTop(step2);
leaf.AllSteps()[0].ShouldBeTheSameAs(step2);
leaf.AllSteps()[1].ShouldBeTheSameAs(step3);
leaf.AllSteps()[2].ShouldBeTheSameAs(step0);
leaf.AllSteps()[3].ShouldBeTheSameAs(step1);
}
public void move_to_top_when_the_step_is_already_first()
{
var leaf = new StepLeaf();
IStep step0 = leaf.AddNewStep();
IStep step1 = leaf.AddNewStep();
IStep step2 = leaf.AddNewStep();
IStep step3 = leaf.AddNewStep();
leaf.MoveToTop(step0);
leaf.AllSteps()[0].ShouldBeTheSameAs(step0);
leaf.AllSteps()[1].ShouldBeTheSameAs(step1);
leaf.AllSteps()[2].ShouldBeTheSameAs(step2);
leaf.AllSteps()[3].ShouldBeTheSameAs(step3);
}