public void NoPlayersMayHaveARankLessThanOne()
{
var playerRanks = new List<IPlayerRank>();
playerRanks.Add(new PlayerRank() { PlayerId = 1, GameRank = 1 });
playerRanks.Add(new PlayerRank() { PlayerId = 2, GameRank = -1 });
var exception = Assert.Throws<ArgumentException>(() => PlayerRankValidator.ValidatePlayerRanks(playerRanks));
Assert.That(exception.Message, Is.EqualTo(PlayerRankValidator.EXCEPTION_MESSAGE_NO_PLAYER_CAN_HAVE_A_RANK_LESS_THAN_ONE));
}