public void Return_Null_Object_When_Not_Found()
{
var auto = new AutomobileRepository().FindById("foo");
Assert.Equal(Automobile.Null, auto);
Assert.Empty(auto.Start());
Assert.Empty(auto.Stop());
}
public void Return_Concrete_Automobile()
{
var auto = new AutomobileRepository().FindById("mini");
Assert.NotEqual(Automobile.Null, auto);
Assert.Equal("Mini Start", auto.Start());
Assert.Equal("Mini Stop", auto.Stop());
}