["nuj" [path/extension "test.nuj"]]
["nuj" [path/extension "Another/test.nuj"]]
["NUJ" [uppercase [path/extension "Another/test.nuj"]]]
["no" [path/extension "asd/test.nuj.no"]]
["asd/test.nuj" [path/without-extension "asd/test.nuj.no"]]
["" [path/dirname "test.nuj"]]
["Another" [path/dirname "Another/test.nuj"]]
["asd" [path/dirname "asd/test.nuj.no"]]
