public void Did_TransactionDatabase_Support_Returns_Correct() { var transactions = new TransactionDatabase(); transactions.AddTransaction(new Transaction("A,B,C,D")); transactions.AddTransaction(new Transaction("A,B,C,D,A")); transactions.AddTransaction(new Transaction("A,B")); transactions.AddTransaction(new Transaction("A,B,C")); var support = transactions.GetSupportOfTransaction(new Transaction("A,B,C")); Assert.AreEqual(0.75, support, "GetSupportOfTransaction is not equals to 0.75"); }