public void Did_TransactionDatabase_Confidence_Returns_Correct() { var transactions = new TransactionDatabase(); transactions.AddTransaction(new Transaction("A,B,C,D")); transactions.AddTransaction(new Transaction("A,B,C,A")); transactions.AddTransaction(new Transaction("A,B")); transactions.AddTransaction(new Transaction("A,B,C")); var support = transactions.GetConfidenceOfTransactions(new Transaction("A,B"), new Transaction("D")); Assert.AreEqual(0.25, support, "GetSupportOfTransaction is not equals to 0.25"); support = transactions.GetConfidenceOfTransactions(new Transaction("A,B"), new Transaction("A,B")); Assert.AreEqual(1, support, "GetSupportOfTransaction is not equals to 1"); }