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

        Rulebook rb = rulebook;

        rb.playerDeathTimer    = 10.0f;
        rb.rulebookPlayerDeath = 5;
        Assert.Throws <NullReferenceException>(() => rb.PlayerTooManyDeaths());

        Assert.That(rb.rulebookPlayerDeath, Is.EqualTo(0));
    }