How can I stub a controller instance variable using RSpec?

Question

new_controller_spec.rb

require 'spec_helper'

describe NewController do

  describe 'actions' do 

    describe 'POST /franchise_opportunities' do  
     it 'renders v3/franchise_opportunities when domain id 5' do
        domain = double(Domain, mrdeliverycom?: true)
        controller.instance_variable_set(:@domain, domain)

        post :franchise_opportunities, name: 'v'
        response.should render_template('v3/franchise_opportunities')
      end
    end
  end
end

new_controller.rb

# -*- encoding : utf-8 -*-
class NewController < ApplicationController
 before_filter { @domain = ... }
 def franchise_opportunities

    t = Logger.new(STDOUT)
    t.debug '=============================================='
    t.debug @domain
    t.debug @domain.mrdeliverycom?
    t.debug '=============================================='

    render :layout=>'v3', :template=>'v3/franchise_opportunities' and return if @domain && @domain.mrdeliverycom?

    @errors={}
    @post = params.clone
    ...

 end
end

Log

    ==============================================
#<Domain id: 1, name: "hettingersawayn.org", email: "[email protected]", created_at: "2015-06-06 13:11:49", updated_at: "2015-06-06 13:11:49", domain_name: "ziemann.info8732", logo: nil, favicon: nil, slogan: nil, meta_title: nil, meta_keywords: nil, meta_description: nil, about_us: nil, smtp_server: "smtp.gmail.com", smtp_port: "587", smtp_username: nil, smtp_password: nil, smtp_authentication: "plain", smtp_tls: true, background: nil, source: "web", mobile_logo: nil, show_chef: false, ios_icon: nil, intro_text: nil>
    nil
    ==============================================

Seems @domain variable was set in spec method not overridden @domain variable was set in before_filter of the controller.

zetetic · Accepted Answer · 2015-06-06 17:53:03Z

1

In fact the instance variable is set to the value that you provide in the example, but that happens before the before_filter executes, so it ends up being set again.

You could move the initialization from the before_filter into a method in the controller and stub that instead:

before_filter { @domain = get_domain }

...

protected

def get_domain
  ...
end

...

expect(controller).to receive(:get_domain).and_return("stubbed value")

answered Jun 6, 2015 at 17:53

zetetic

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