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));
}