@Test
 public void game_gets_a_random_outcome_when_the_ball_stops_rolling() {
   // act
   when(rng.generate(0, 36)).thenReturn(13);
   when(rng.generate(30, 40)).thenReturn(33);
   rt.roll();
   timer.moveTime(34000);
   // assert
   assertEquals(13, rt.getBallPosition());
 }