/usr/ is in ruby-test-declarative 0.0.5-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/test_declarative/
/usr/lib/ruby/vendor_ruby/test_declarative/version.rb
/usr/lib/ruby/vendor_ruby/test_declarative.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-test-declarative/
/usr/share/doc/ruby-test-declarative/README.textile
/usr/share/doc/ruby-test-declarative/copyright
/usr/share/doc/ruby-test-declarative/changelog.Debian.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_declarative-0.0.5.gemspec
/usr/share/rubygems-integration/2.0/
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/test_declarative-0.0.5.gemspec