No, the filetype_extension.conf used in the unittests is already a copy in a custom directory
Thanks for clarifying this, I didn't know that.
Anyway, it's a mere matter of `+sed 's/^([^=[]{1,})(=[^;]{1,}(;[^;]{1,})*);*$/\1\2;*.\1_unittest;/' ` `+ < "${top_srcdir:-../..}"/data/filetype_extensions.conf > "$CONFDIR/filetype_extensions.conf" || exit 99`
:-)
I can prepare a PR if you're happy enough with this.
I didn't even try to understand the sed, I believe your "mere matter" implementation :-). Please go ahead with the PR.