/usr/lib/ruby/vendor_ruby/mechanize/test_case/ is in ruby-mechanize 2.7.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/mechanize/test_case/bad_chunking_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/basic_auth_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/content_type_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/digest_auth_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/file_upload_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/form_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/gzip_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/header_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/http_refresh_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/infinite_redirect_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/infinite_refresh_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/many_cookies_as_string_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/many_cookies_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/modified_since_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/ntlm_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/one_cookie_no_spaces_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/one_cookie_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/quoted_value_cookie_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/redirect_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/referer_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/refresh_with_empty_url.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/refresh_without_url.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/response_code_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/send_cookies_servlet.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/server.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/servlets.rb
/usr/lib/ruby/vendor_ruby/mechanize/test_case/verb_servlet.rb