RSpec:重新打开类时存根 Rails.application.config 值不起作用? [英] RSpec: stubbing Rails.application.config value doesn't work when reopening classes?

问题描述

我在应用程序配置中定义了一个选项.我要测试的课程是在 gem 中定义的(不是我写的).我想重新开课:

I have an option defined in application config. My class I want to test is defined in a gem (not written by me). I want to reopen the class:

Myclass.class_eval do

   if Rails.application.config.myoption=='value1'
      # some code
      def self.method1
      end
   else 
       # another code
      def self.method2
      end
   end
end

我想使用 RSpec 3 测试此代码:

I want to test this code using RSpec 3:

# myclass_spec.rb

require "rails_helper"

RSpec.describe "My class" do
  allow(Rails.application.config).to receive(:myoption).and_return('value1')

  context 'in taxon' do

  it 'something' do
    expect(Myclass).to respond_to(:method1)
  end

  end
end

如何在运行重新打开类的代码之前存根应用程序配置值.

How to stub application config value before running the code which reopens a class.

推荐答案

哇，这已经存在很长时间了，但就我而言，我所做的是:

Wow, this have been here for a long time, but in my case what I did was:

allow(Rails.configuration.your_config)
  .to receive(:[])
  .with(:your_key)
  .and_return('your desired return')

规范传递和配置值存根正确.=)

Specs passing and config values stubed correctly. =)

现在，另一件事是关于你的实现，我认为如果你从 run 或你决定执行的东西中定义两个方法和内部会更好.像这样:

Now, the other thing is about your implementation, I think it would be better if you defined both methods and inside from a run or something you decided wich one to execute. Something like this:

class YourClass
  extend self

  def run
    Rails.application.config[:your_option] == 'value' ? first_method : second_method
  end

  def first_method
    # some code
  end

  def second_method
    # another code
  end
end

希望这会有所帮助.

哦，是的，我的错，我的回答基于这个一个.

Oh yeah, my bad, I based my answer on this one.

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