/usr/ is in ruby-test-spec 0.10.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/bin/
/usr/bin/specrb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-test-spec/
/usr/share/doc/ruby-test-spec/examples/
/usr/share/doc/ruby-test-spec/examples/stack_spec.rb
/usr/share/doc/ruby-test-spec/examples/stack.rb
/usr/share/doc/ruby-test-spec/copyright
/usr/share/doc/ruby-test-spec/README.gz
/usr/share/doc/ruby-test-spec/changelog.Debian.gz
/usr/share/man/
/usr/share/man/man1/
/usr/share/man/man1/specrb.1.gz
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/test-spec-0.10.0.gemspec
/usr/share/rubygems-integration/1.8/
/usr/share/rubygems-integration/1.8/specifications/
/usr/share/rubygems-integration/1.8/specifications/test-spec-0.10.0.gemspec
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/test/
/usr/lib/ruby/vendor_ruby/test/spec.rb
/usr/lib/ruby/vendor_ruby/test/spec/
/usr/lib/ruby/vendor_ruby/test/spec/rdox.rb
/usr/lib/ruby/vendor_ruby/test/spec/dox.rb
/usr/lib/ruby/vendor_ruby/test/spec/should-output.rb
/usr/lib/ruby/vendor_ruby/test/spec/version.rb