adding authentication helper test method for devise_auth_token

app/controllers/concerns/followable_controller.rb

+## This concern has +follow+ and +unfollow+ controller actions
+## When you use it, be sure that +set_followable+ method is implemented in your controller, otherwise an fatal error will raise.
+module FollowableController
+  extend ActiveSupport::Concern
+
+  included do
+    before_action :set_followable, only: [:follow, :unfollow]
+  end
+
+  # POST /v1/users/1/follow
+  # POST /v1/users/1/follow.json
+  def follow
+    current_user.follow(@followable) unless current_user.following? @followable
+  end
+
+  # DELETE /v1/users/1/unfollow
+  # DELETE /v1/users/1/unfollow.json
+  def unfollow
+    current_user.unfollow(@followable) if current_user.following? @followable
+  end
+
+end
\ No newline at end of file

app/controllers/v1/users_controller.rb

 class V1::UsersController < ApplicationController
+  include ::FollowableController
   before_action :set_user, only: [:show, :update, :destroy]
 
   # GET /v1/users
@@ -43,18 +44,12 @@ class V1::UsersController < ApplicationController
     render nothing: true, status: :ok
   end
 
-  # POST /v1/users/1/follow
-  # POST /v1/users/1/follow.json
-  def follow
-  end
+  private
 
-  # POST /v1/users/1/unfollow
-  # POST /v1/users/1/unfollow.json
-  def unfollow
+  def set_followable
+    @followable = set_user
   end
 
-  private
-
   def set_user
     @user = User.find(params[:id])
   end

test/fixtures/users.yml

 john:
   name: 'John'
   email: 'john@test.com'
+  confirmed_at: '2015-10-10 15:30:22'
 
 jack:
   name: 'Jack'

test/test_helper.rb

@@ -17,6 +17,12 @@ class ActiveSupport::TestCase
     assert_equal expected.to_i, actual.count
   end
 
+  # authenticate requests using devise_token_auth
+  def auth_request(user)
+    sign_in user
+    request.headers.merge!(user.create_new_auth_token)
+  end
+
   def mock
     MiniTest::Mock.new
   end