public void MostExpensiveAccountByYear_TwentyTransactionsInInput()
        {
            //arrange
            int year = 2020;
            TransactionProcessor transactionProcessor = new TransactionProcessor(transactions);

            //act
            TransactionsStatistics statistics = transactionProcessor.MostExpensiveAccount(year);

            //assert
            Assert.AreEqual("Account0", statistics.Account);
            Assert.AreEqual(-5500, statistics.Amount);
        }
        public void MostExpensiveAccountByMonth_TwentyTransactionsInInput()
        {
            //arrange
            int year  = 2020;
            int month = 1;
            TransactionProcessor transactionProcessor = new TransactionProcessor(transactions);

            //act
            TransactionsStatistics statistics = transactionProcessor.MostExpensiveAccount(month, year);

            //assert
            Assert.AreEqual("Account6", statistics.Account);
            Assert.AreEqual(-2000, statistics.Amount);
        }