/usr/lib/ruby/vendor_ruby/aruba/matchers/ is in ruby-aruba 0.14.2-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/aruba/matchers/base/
/usr/lib/ruby/vendor_ruby/aruba/matchers/base/base_matcher.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/base/object_formatter.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/collection/
/usr/lib/ruby/vendor_ruby/aruba/matchers/collection.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/collection/all.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/collection/include_an_object.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/command/
/usr/lib/ruby/vendor_ruby/aruba/matchers/command.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/command/be_successfully_executed.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/command/have_exit_status.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/command/have_finished_in_time.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/command/have_output.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/command/have_output_on_stderr.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/command/have_output_on_stdout.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/command/have_output_size.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/directory/
/usr/lib/ruby/vendor_ruby/aruba/matchers/directory.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/directory/be_an_existing_directory.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/directory/have_sub_directory.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/environment.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/file/
/usr/lib/ruby/vendor_ruby/aruba/matchers/file.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/file/be_a_command_found_in_path.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/file/be_an_existing_executable.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/file/be_an_existing_file.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/file/have_file_content.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/file/have_file_size.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/file/have_same_file_content.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/path/
/usr/lib/ruby/vendor_ruby/aruba/matchers/path.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/path/a_path_matching_pattern.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/path/be_an_absolute_path.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/path/be_an_existing_path.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/path/have_permissions.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/path/match_path_pattern.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/rspec_matcher_include_regexp.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/string/
/usr/lib/ruby/vendor_ruby/aruba/matchers/string.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/string/include_output_string.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/string/match_output_string.rb
/usr/lib/ruby/vendor_ruby/aruba/matchers/string/output_string_eq.rb