测试设计用户登录但得到 401 未经授权的响应

Question

我使用的是devise_auth_token创业板rails-api应用程序，其中我试图测试，如果user是logged_in则user有权render通过index在行动welcome_controller。

欢迎控制器

class Api::WelcomeController < ApplicationController
  before_action :authenticate_user!

  def index
    render json: {
      data: {
        message: "Welcome #{current_user.first_name}",
        user: current_user
      }
    }, status: 200
  end
end

路线

Rails.application.routes.draw do
  mount_devise_token_auth_for 'User', at: 'auth'
  namespace :api do
    get 'welcome', to: 'welcome#index'
    resources :socities
  end
end

Welcome_controller_test

require 'test_helper'

class Api::WelcomeControllerTest < ActionDispatch::IntegrationTest
  def test_index_renders_message
    admin = users :admin
    sign_in admin
    get "/api/welcome"
    assert_response :success
  end
end

夹具用户.yml

admin:
  uid: admin@example.com
  provider: email
  email: admin@example.com
  first_name: Ahmad
  last_name: Hamza
  nickname: nil
  society_id: 1
  encrypted_password: $2a$10$kPXgGIFeHxoek/UgfwtVFeLCLYgIB82Cazj8c6GZz2I/p68ohfp9K #1234test
  confirmed_at: 2017-01-02 08:31:23
  confirmation_sent_at: 2017-01-02 08:30:59
  role: admin

test_helper.rb

ENV['RAILS_ENV'] ||= 'test'
require File.expand_path('../../config/environment', __FILE__)
require 'rails/test_help'

class ActiveSupport::TestCase
  # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
  fixtures :all

  # Add more helper methods to be used by all tests here...
end

class ActionDispatch::IntegrationTest
  include Devise::Test::IntegrationHelpers
end

错误

Failure:
Api::WelcomeControllerTest#test_index_renders_message [/Users/ahmadhamza/sites/manage_society/test/controllers/api/welcome_controller_test.rb:8]:
Expected response to be a <2XX: success>, but was a <401: Unauthorized>

如何检查发生了什么问题？