public void It_starts_with_the_first_scene()
{
var scene = new StoryScene();
var engine = An.Engine().WithScene(scene).Build();
engine.NextScene();
Assert.AreEqual(engine.CurrentScene, scene);
}
public void It_requires_a_scene_to_start()
{
Assert.Throws <ArgumentNullException>(() => An.Engine().Build());
}