it '決済ができる' do
  customer_mock = double(:customer_mock) # doubleでモック作る
  charge_mock = double(:charge_mock)
  allow(Payjp::Customer).to receive(:create).and_return(customer_mock) # Payjp::Customerのcreateがよばれたらそのモックを返すようにする
  allow(Payjp::Customer).to receive(:retrieve).and_return(customer_mock)
  allow(Payjp::Charge).to receive(:create).and_return(charge_mock)
  allow(customer_mock).to receive(:id).and_return('dummy_customer_id') # そのもっくはidという属性を持っていてそれはdummy_customer_idを返す
  allow(charge_mock).to receive(:id).and_return('dummy_charge_id')
  allow(charge_mock).to receive(:price).and_return(11000)

  # あとは普通にexpectするだけ
end