无论如何在rspec测试中存根局部变量？

Question

我在我试图测试的方法中看到这样的代码：

  service = if user_activator?
                SomeService.new(subscription.user, cookies: cookies)
             elsif sub_activator?
                 SomeOtherService.build(subscription: subscription, cookies: cookies)
            end

我正在尝试将服务存根作为SomeService的一个实例，然后尝试查看它是否收到一个包含如下代码的方法：

expect(some_service_instance).to receive(:activate).with(hash_including(
          app_context: app_context,
          cookies: cookies,
          subscription: subscription
        ))

但有没有办法将局部变量存根为UserActivationService的实例？

以下是我认为可行的一些方法？

首先，我应该将条件局部变量集提取到这样的方法中（这感觉很可疑）：

def service
    if some_service_activator?
      SomeService.new(subscription.user, cookies: cookies)
    elsif sub_activator?
      SomeOtherService.build(subscription: subscription, cookies: cookies)
    end
  end

然后我可以做到：

let(:some_service_instance) { SomeService.new(subscription.user, cookies: cookies) }
allow(<something that returns an instance of the class I am testing>).to receive(:service) { some_service_instance }

然后

  expect(some_service_instance).to receive(:activate).with(hash_including(
          app_context: app_context,
          cookies: cookies,
          subscription: subscription
        ))

这是犹太人吗？

Answer 1

假设这一切都在控制器内发生，我想你想使用@controller变量。

let(:user_activation_service_instance) { UserActivationService.new(subscription.user, cookies: cookies) }
allow(@controller).to receive(:service) { user_activation_service_instance }