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