/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/ is in ruby-railties 2:4.2.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/controller/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/controller/controller_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/controller/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/controller/templates/functional_test.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/generator/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/generator/generator_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/generator/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/generator/templates/generator_test.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/helper/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/helper/helper_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/integration/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/integration/integration_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/integration/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/integration/templates/integration_test.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/job/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/job/job_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/job/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/job/templates/unit_test.rb.erb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/mailer/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/mailer/mailer_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/mailer/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/mailer/templates/functional_test.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/mailer/templates/preview.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/model/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/model/model_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/model/templates/
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/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/plugin/
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/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/plugin/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/plugin/templates/%file_name%_test.rb.tt
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/plugin/templates/test_helper.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/scaffold/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/scaffold/scaffold_generator.rb
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/scaffold/templates/
/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/scaffold/templates/functional_test.rb