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