ct/py/test_data/csv_merger/four_entries_with_quotes.csv

"e,heading",z,b,"a,heading"
a5.1,z5.1,b5.1,e5.1
a5.2,z5.2,b5.2,e5.2
a5.3,z5.3,b5.3,e5.3
a5.4,z5.4,b5.4,e5.4