/usr/lib/ruby/vendor_ruby/rails/generators/test_unit/mailer/templates/preview.rb is in ruby-railties 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 4 5 6 7 8 9 10 11 12 13 | <% module_namespacing do -%>
# Preview all emails at http://localhost:3000/rails/mailers/<%= file_path %>
class <%= class_name %>Preview < ActionMailer::Preview
<% actions.each do |action| -%>
# Preview this email at http://localhost:3000/rails/mailers/<%= file_path %>/<%= action %>
def <%= action %>
<%= class_name %>.<%= action %>
end
<% end -%>
end
<% end -%>
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