public void Should_Call_IRankService_When_Ranking_Hands() { var hand = new List <string> { "3C", "3H", "3D", "AC", "DC" }; _rankService.GetRankFromHand(hand).Returns(new Rank(4, "3C")); _handRankerService.RankHand(new List <string>()); Check.That(_rankService.Received(1)); }