class RuboCop::Cop::Minitest::RedundantMessageArgument

def on_send(node)
  return unless (redundant_message_argument = redundant_message_argument(node))
  add_offense(redundant_message_argument) do |corrector|
    if node.arguments.one?
      range = redundant_message_argument
    else
      index = node.arguments.index(redundant_message_argument)
      range = node.arguments[index - 1].source_range.end.join(redundant_message_argument.source_range.end)
    end
    corrector.remove(range)
  end
end