/usr/lib/ruby/vendor_ruby/action_dispatch/testing/assertions/dom.rb is in ruby-actionpack 2:4.2.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | require 'active_support/deprecation'
ActiveSupport::Deprecation.warn("ActionDispatch::Assertions::DomAssertions has been extracted to the rails-dom-testing gem.")
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