public void ToString_Example2_ReturnsFormattedAccountNumber()
        {
            // arrange
            var account = new NZBankAccount(8, 6523, 1954512, 1);

            // act
            var result = account.ToString();

            // assert
            Assert.AreEqual("08-6523-1954512-01", result);
        }
        public void ToString_Example3_ReturnsFormattedAccountNumber()
        {
            // arrange
            var account = new NZBankAccount(26, 2600, 320871, 32);

            // act
            var result = account.ToString();

            // assert
            Assert.AreEqual("26-2600-0320871-32", result);
        }
        public void ToString_Example1_ReturnsFormattedAccountNumber()
        {
            // arrange
            var account = new NZBankAccount(1, 902, 68389, 0);

            // act
            var result = account.ToString();

            // assert
            Assert.AreEqual("01-0902-0068389-00", result);
        }