RailsチュートリアルエラーExpected response to be a <3XX: redirect>, but was a <200: OK>

#エラー発生！

Railsチュートリアルも13章に差し掛かり、早く終わりたいと取り組んでいると
エラーが重なり迷走していると、またエラーが！

FAIL["test_should_not_allow_the_not_activated_attribute", UsersControllerTest, 1.5222024869999586]
 test_should_not_allow_the_not_activated_attribute#UsersControllerTest (1.52s)
        Expected response to be a <3XX: redirect>, but was a <200: OK>
        test/controllers/users_controller_test.rb:66:in `block in <class:UsersControllerTest>'

users_contrloller_test.rb

require 'test_helper'

class UsersControllerTest < ActionDispatch::IntegrationTest

  def setup
    @user = users(:michael)
    @other_user = users(:archer)
    #11.3演習テスト
    @non_activated_user = users(:non_activated)
  end
  
  test "should redirect index when not logged in" do
    get users_path
    assert_redirected_to login_url
  end
  
  test "should get new" do
    get signup_path
    assert_response :success
  end

  test "should redirect edit when not logged in" do
    get edit_user_path(@user)
    assert_not flash.empty?
    assert_redirected_to login_url
  end

  test "should redirect update when not logged in" do
    patch user_path(@user), params: { user: { name: @user.name,
                                              email: @user.email } }
    assert_not flash.empty?
    assert_redirected_to login_url
  end
  
  test "should not allow the admin attribute to be edited via the web" do
    log_in_as(@other_user)
    assert_not @other_user.admin?
    patch user_path(@other_user), params: { user: { password:              @other_user.password,
                                                    password_confirmation: @other_user.password_confirmation,
                                                    admin: true } }
    assert_not @other_user.reload.admin?
  end
  
  test "should redirect destroy when not logged in" do
    assert_no_difference 'User.count' do
      delete user_path(@user)
    end
    assert_redirected_to login_url
  end

  test "should redirect destroy when logged in as a non-admin" do
    log_in_as(@other_user)
    assert_no_difference 'User.count' do
      delete user_path(@user)
    end
    assert_redirected_to root_url
  end
  
  #11.3演習テスト　https://www.yokoyan.net/entry/2017/09/14/070000
  test "should not allow the not activated attribute" do
    log_in_as(@non_activated_user)
    assert_not @non_activated_user.activated?
    get users_path
    assert_select "a[href=?]", user_path(@non_activated_user), count: 0
    get user_path(@non_activated_user)
    assert_redirected_to root_url #<=ここがエラー
  end
end

assert_redirected_to root_url が問題のようだ
users_controller.rbを見てみると…
redirect_to root_url and return unless @user.activated?
が抜けてました！

users_controller.rb

class UsersController < ApplicationController
  before_action :logged_in_user, only: [:index, :edit, :update, :destroy]
  before_action :correct_user,   only: [:edit, :update]
  before_action :admin_user,     only: :destroy
  
  def index
    @users = User.where(activated: true).paginate(page: params[:page])
  end
  
  def show
    @user = User.find(params[:id])
    redirect_to root_url and return unless @user.activated?
    @microposts = @user.microposts.paginate(page: params[:page]) #13.23
  end
  
  def new
    @user = User.new
  end
  
  def create
    @user = User.new(user_params)
    if @user.save
      @user.send_activation_email
      flash[:info] = "Please check your email to activate your account."
      redirect_to root_url
    else
      render 'new'
    end
  end

  def edit
    @user = User.find(params[:id])
  end
  
  def update
    @user = User.find(params[:id])
    if @user.update_attributes(user_params)
      flash[:success] = "Profile updated"
      redirect_to @user
    else
      render 'edit'
    end
  end

  def destroy
    User.find(params[:id]).destroy
    flash[:success] = "User deleted"
    redirect_to users_url
  end

  private

    def user_params
      params.require(:user).permit(:name, :email, :password,
                                   :password_confirmation)
    end
    
    # 正しいユーザーかどうか確認
    def correct_user
      @user = User.find(params[:id])
      redirect_to(root_url) unless current_user?(@user)
    end
    
    # 管理者かどうか確認
    def admin_user
      redirect_to(root_url) unless current_user.admin?
    end
end