public void Stages_DestroyViewport_CatchNull()
{
var renderStageManager = Substitute.For <IRenderStageManager>();
var viewportManager = Substitute.For <IViewportManager>();
var renderStageVisitor = Substitute.For <IRenderStageVisitor>();
IStages stages = new Stages(renderStageManager, viewportManager, renderStageVisitor);
Assert.Throws <Yak2DException>(() => { stages.DestroyViewport(null); });
}
