class RuboCop::Cop::Minitest::RefuteOperator

def build_new_arguments(node)
  lhs, op, rhs = *node.first_argument
  new_arguments = +"#{lhs.source}, :#{op}, #{rhs.source}"
  if node.arguments.count == 2
    new_arguments << ", #{node.last_argument.source}"
  else
    new_arguments
  end
end