public void M_CanAddNewTransactionToEndOfSavginsSheet()
{
// Arrange
var expected_sheet_name = MainSheetNames.Savings;
DateTime new_date = new DateTime(2018, 11, 25);
double new_amount = 32.45;
var mock_spreadsheet_repo = new Mock <ISpreadsheetRepo>();
int expected_row_number = 49;
int first_column = 1;
mock_spreadsheet_repo.Setup(x => x.Find_first_empty_row_in_column(
expected_sheet_name,
first_column))
.Returns(expected_row_number);
var spreadsheet = new Spreadsheet(mock_spreadsheet_repo.Object);
// Act
spreadsheet.Add_new_transaction_to_savings(new_date, new_amount);
// Assert
mock_spreadsheet_repo.Verify(x => x.Update_date(
expected_sheet_name,
expected_row_number,
first_column,
new_date));
mock_spreadsheet_repo.Verify(x => x.Update_amount(
expected_sheet_name,
expected_row_number,
first_column + 1,
new_amount));
}