As a business user I need a tool that reads an accounting log in csv format that sums up all amounts per account_id and month and outputs a csv with summaries so we can double check the bookings easily.
- the tool accepts 2 file names (input and output)
- output is a csv file with following fields
- MONTH - the month of the booking in format yyyy/mm
- ACCOUNT_ID - an ACCOUNT_ID from the input file
- SUM_OF_AMOUNT - the sum of all input amounts for a ACCOUNT_ID per MONTH
- empty lines in the input file are ignored
- the amount from the input is summed up, grouped by ACCOUNT_ID and MONTH
- separator is a comma ','
- the file has a header line
- there are no quotes used
- there can't be a comma in one of the fields
- the file may contain empty lines (no character or just white spaces)
- the file is encoded in UTF-8 without BOM marker
- the file has 4 columns
- TIME_STAMP - time of booking in format yyyy-mm-dd hh:mi:ss
- ACCOUNT_ID - Integer number
- EMPLOYEE - String (name of employee)
- AMOUNT - floating point number
- good_input.csv - a sample input file that has no validation error
- good_output.csv - expected output from processing good_input.csv
- the tool writes a error file with rejected records
- the header and each line is checked for the expected number of columns
- every field is trimmed from whitespace
- input record validation is done
- no field may be empty after trimming
- TIME_STAMP must be in expected format
- only valid ACCOUNT_ID are accepted, list of IDs:
- 10101
- 10302
- 10506
- 10780
- input lines that are rejected in validation are written to an error csv file
- the error records have an additional column with a reason for being rejected
- input_with_error.csv - a sample input file that has all kinds of validation problems
- input_with_error_output.csv - expected output from processing input_with_error.csv