class RuboCop::Cop::GitHub::RailsViewRenderPathsExist

def on_send(node)
  return unless cop_config["ViewPath"]
  if args = render_str?(node)
    node, path = args
    unless resolve_partial(path.to_s)
      add_offense(node, message: "Partial template could not be found")
    end
  elsif pairs = render_options?(node)
    if pair = pairs.detect { |p| partial_key?(p) }
      node, path = partial_key?(pair)
      unless resolve_partial(path.to_s)
        add_offense(node, message: "Partial template could not be found")
      end
    end
  end
end

def resolve_partial(path)
  parts = path.split(File::SEPARATOR)
  parts << "_#{parts.pop}"
  path = parts.join(File::SEPARATOR)
  cop_config["ViewPath"].each do |view_path|
    if m = Dir[File.join(config.path_relative_to_config(view_path), path) + "*"].first
      return m
    end
  end
  nil
end