public void TwoPowerups_Should_DoubleTime()
{
var sprite = new Sprite();
powerupManager.AddTimedPowerup(sprite, PowerUpType.FastBall, 1, Assert.Fail);
powerupManager.AddTimedPowerup(sprite, PowerUpType.FastBall, 1, Assert.Fail);
var elapsed = TimeSpan.FromSeconds(1);
var time = new GameTime(elapsed, elapsed);
powerupManager.UpdateTimedPowerup(time);
Assert.True(powerupManager.HasPowerup(sprite, PowerUpType.FastBall));
}