public void Test_Auction_Can_Accept_Bid() { var user = new User() { UserName = testUserName }; var userRepo = new UsersRepository(); userRepo.Add(user); userRepo.SetLogin(user, true); var repo = new AuctionRepository(); var sut = new AuctionService(repo, userRepo); var auctionId = sut.CreateAuction(testUserName, DateTime.UtcNow.AddDays(1)); var auction = repo.FindAuctionById(auctionId); var myBid = new Bid { amount = 1.75, bidder = "Joe", User = user }; sut.CreateBid(auctionId, 10.0, ) Assert.True(myBid.amount > auction.HighestBid.amount); // public double amount { get; set; } // public string bidder { get; set; } // public User User { get; set; } }