ruby - How to mock Rails::configuration -

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I am trying to test a class that uses the rail configuration file. I have the railway railway :: configuration I want to joke.

I have tried things 

  Rail: :: singleton_class.expects (: configuration). Return ('Result') Rail :: singleton_class.stubs (: Configuration). Return ('Result')   
 How can I go about doing this?   
 
 
  rail. Estimate (configuration). Return ('Result')   
 Please note that there was a typo in your example. Return value  returns ,  return   
  
 Also note that,  Rails.configuration  returns  Rails.application.config . If your method does not use the  Rails.configuration , it can actually block the call and your expectation will not work.

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