mocha是否在存根(Rails)中运行代码？

Question

我是tdd和存根的新手。当我存根一个方法时，我假设该方法中的任何代码都不会被执行？我试图伪造该方法，引发一个异常，但我的测试结果表明，该方法中的代码正在执行而不是被绕过。

有谁能解释一下原因吗？

我的短桩是

@logged_in_user.subscription.stubs(:stop_auto_renew).raises(:RuntimeError)

并且在上下文中

test "canceling subscription should handle exception raised by spreedly" do
    login_larry_active
    @logged_in_user.subscription.stubs(:stop_auto_renew).raises(:RuntimeError)
    delete :destroy, {:user_id => @logged_in_user.id}
    assert flash[:notice]
    assert_redirected_to :controller => :dashboard, :action => :welcome
end

这是我的模型中的方法，我正在尝试存根。Spreedly::Subscriber通常会从网络上获取内容。

class Subscription < ActiveRecord::Base
    protected
    def stop_auto_renew
        Spreedly::Subscriber.find(self.user.id).stop_auto_renew()
    end
end

-

class SubscriptionsController < ApplicationController    
    def destroy
        user = User.find(params[:user_id])
        if user
            begin
                user.subscription.stop_auto_renew
            rescue RuntimeError
                #log something and email admin
                ldb("Spreedly cant process stop_auto_renew for user id: #{user.id}")
                #email admin
            end
            flash[:notice] = "You have successfully cancelled your subscription and will take effect at the end of your current billing month"
        end    
        redirect_to :controller => :dashboard, :action => :welcome
    end
end

测试误差是

4) Error:
test_canceling_subscription_should_handle_exception_raised_by_spreedly(SubscriptionsControllerTest):
NoMethodError: You have a nil object when you didn't expect it!
The error occurred while evaluating nil.stop_auto_renew
    app/models/subscription.rb:18:in `stop_auto_renew'
    app/controllers/subscriptions_controller.rb:31:in `destroy'
    /test/functional/subscriptions_controller_test.rb:42:in `test_canceling_subscription_should_handle_exception_raised_by_spreedly'

Answer 1

我可能是错的，但我的猜测是，您已经将方法:stop_auto_renew存根到了对象@logged_in_user.subscription上(我假设用户有订阅？)但是，调用实际上是在从控制器中的User.find(params[:user_id])创建的另一个实例上进行的。

也许可以尝试Subscription.any_instance.stubs(:stop_auto_renew)...，它应该存根一个订阅的所有实例。