/usr/lib/ruby/ is in ruby-minitest 5.8.4-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/minitest/
/usr/lib/ruby/vendor_ruby/minitest/mock.rb
/usr/lib/ruby/vendor_ruby/minitest/pride_plugin.rb
/usr/lib/ruby/vendor_ruby/minitest/expectations.rb
/usr/lib/ruby/vendor_ruby/minitest/unit.rb
/usr/lib/ruby/vendor_ruby/minitest/assertions.rb
/usr/lib/ruby/vendor_ruby/minitest/parallel.rb
/usr/lib/ruby/vendor_ruby/minitest/autorun.rb
/usr/lib/ruby/vendor_ruby/minitest/hell.rb
/usr/lib/ruby/vendor_ruby/minitest/benchmark.rb
/usr/lib/ruby/vendor_ruby/minitest/test.rb
/usr/lib/ruby/vendor_ruby/minitest/pride.rb
/usr/lib/ruby/vendor_ruby/minitest/spec.rb
/usr/lib/ruby/vendor_ruby/minitest.rb
/usr/lib/ruby/vendor_ruby/hoe/
/usr/lib/ruby/vendor_ruby/hoe/minitest.rb