public void tooManyPlayerHits()
    {
        Rulebook rulebook = new Rulebook();

        Rulebook rb = rulebook;

        rb.tooManyPlayerHitsTimer = 5.0f;
        rb.isPlayerHitTooMuch     = 4;
        Assert.Throws <NullReferenceException>(() => rb.TooManyPlayerHits());

        Assert.That(rb.tooManyPlayerHitsTimer, Is.EqualTo(0.0f));
        Assert.That(rb.isPlayerHitTooMuch, Is.EqualTo(0));
    }