plain: ok
empty_fields: ok
quoted_plain: ok
quoted_sep: ok
quoted_sep_last: ok
escaped_quote: ok
escaped_quote_only: ok
mixed_quoting: ok
opt_sep: ok
opt_numbers: ok
opt_trim: ok
opt_functor: ok
opt_arity_ok: ok
opt_arity_bad: ok
write_quoting: ok
write_plain: ok
roundtrip: ok
err_write_bad_row: ok