I&#39;m using Rails 5, and Devise 3.5.1.

Going through a nice (older) book about creating/testing an API, which uses Devise authentication. It was written before Rails 5, so I chose not to use the new api-only version.

Here&#39;s my test...

    #/spec/controllers/api/v1/users_controller_spec.rb    

    require &#39;rails_helper&#39;
    
    describe Api::V1::UsersController, :type =&gt; :controller do
        before(:each) { request.headers[&#39;Accept&#39;] = &quot;application/vnd.marketplace.v1&quot; }
        describe &quot;GET #show&quot; do
            before(:each) do
                @user = FactoryGirl.create :user
                get :show, params: {id: @user.id}, format: :json
            end
            it &quot;returns the information about a reporter on a hash&quot; do
                user_response = JSON.parse(response.body, symbolize_names: true)
                expect(user_response[:email]).to eql @user.email
            end
            it { should respond_with 200 }
        end
    end

And here&#39;s a completely unexpected RSpec error

    Devise::MissingWarden:
           Devise could not find the `Warden::Proxy` instance on your request environment.
           Make sure that your application is loading Devise and Warden as expected and that the `Warden::Manager` middleware is present in your middleware stack.
           If you are seeing this on one of your tests, ensure that your tests are either executing the Rails middleware stack or that your tests are using the `Devise::Test::ControllerHelpers` module to inject the `request.env[&#39;warden&#39;]` object for you.


So I go here - http://www.rubydoc.info/gems/devise/Devise/Test/ControllerHelpers

and tried this -&gt; **include Devise::Test::ControllerHelpers**

which didn&#39;t help because the file `controller_helpers.rb` is nowhere in my project

What did I miss here?

Thanks

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Why is my RSpec not loading Devise::Test::ControllerHelpers?