Unable to get this part of the testing in the TDD todo app to work for me

controller

class CompletionsController < ApplicationController
  def create
  	todo = Todo.find(params[:todo_id])
  	todo.touch :completed_at
  	redirect_to todos_path
  end  
end

index

<ul>
<% @todos.each do |todo| %>
  <li class= 'todo<%= 'completed' if todo.completed_at? %>' >
  	<%= todo.description %>
  	<%= link_to 'Complete', todo_completion_path(todo), method: :post %>
  </li>

<% end %>
</ul>
<%= link_to 'Add new todo', new_todo_path %>

integration

require 'spec_helper'

feature 'Manage todos' do
  scenario 'create new todo' do
    sign_in

    create_todo_with_description 'Read three chapters of RSpec book'

    user_sees_todo_item 'Read three chapters of RSpec book'
    # RSpec deletes all the todos from the database
  end

  scenario 'view only my todos' do
    # todo = Todo.where(description: 'Read three chapters of RSpec book').first
    # expect(todo).to be_nil
    sign_in
    
    create(:todo, description: 'Buy coffee cream', owner_email: 'not_me@example.com')
      
    user_does_not_see_todo_item 'Buy coffee cream'
  end

  scenario 'denote completed todos' do
    sign_in
    create_todo_with_description 'Buy coffee cream'

    within 'li.todo' do
      click_link 'Complete'
    end
    
    expect(page).to have_css 'li.todo.completed'
   
  end   


  def create_todo_with_description(description)
    click_link 'Add new todo'
    fill_in 'Description', with: description
    click_button 'Create todo'
  end

  def user_sees_todo_item(description)
    expect(page).to have_css 'li.todo', text: description
  end

  def user_does_not_see_todo_item(description)
    expect(page).not_to have_css 'li.todo', text: description
  end

## The following def block was moved into a module
## to keep our features nice and slim. 
## The logic for signing in is in a module
## that can be managed separately, so if the logic for
## signing in changes, it's all contained in the 
## SignInHelpers module under spec/support.
 

#  def sign_in
#  	visit root_path
#  	fill_in 'Email address', with: 'person@email.com'
#  	click_button 'Sign In'
#  end
end

	

routes

Todos::Application.routes.draw do
  root to: 'high_voltage/pages#show', id: 'home'
  resource :session, only: [:create]
  resources :todos, only: [:index, :new, :create] do
    resource :completion, only: [:create]
  end
end

terminal

➜  todos git:(master) ✗ rake routes
WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.9.0
           root      /                                    high_voltage/pages#show {:id=>"home"}
        session POST /session(.:format)                   sessions#create
todo_completion POST /todos/:todo_id/completion(.:format) completions#create
          todos GET  /todos(.:format)                     todos#index
                POST /todos(.:format)                     todos#create
       new_todo GET  /todos/new(.:format)                 todos#new
           page GET  /pages/*id                           high_voltage/pages#show
➜  todos git:(master) ✗ rspec spec/integration/manage_todos_spec.rb:23
WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.9.0
Run options: include {:locations=>{"./spec/integration/manage_todos_spec.rb"=>[23]}}
[deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
F

Failures:

  1) Manage todos denote completed todos
     Failure/Error: expect(page).to have_css 'li.todo.completed'
       expected css "li.todo.completed" to return something
     # ./spec/integration/manage_todos_spec.rb:31:in `block (2 levels) in <top (required)>'

Finished in 0.29813 seconds
1 example, 1 failure

Failed examples:

rspec ./spec/integration/manage_todos_spec.rb:23 # Manage todos denote completed todos

Randomized with seed 13015

➜  todos git:(master) ✗ rspec spec/integration/manage_todos_spec.rb:23
WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.9.0
Run options: include {:locations=>{"./spec/integration/manage_todos_spec.rb"=>[23]}}
[deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
F

Failures:

  1) Manage todos denote completed todos
     Failure/Error: click_button 'Create todo'
     ActionView::Template::Error:
       undefined method `completed?' for #<Todo:0x000000050ea948>
     # ./app/views/todos/index.html.erb:3:in `block in _app_views_todos_index_html_erb__3364276476556946193_43849380'
     # ./app/views/todos/index.html.erb:2:in `_app_views_todos_index_html_erb__3364276476556946193_43849380'
     # (eval):2:in `click_button'
     # ./spec/integration/manage_todos_spec.rb:39:in `create_todo_with_description'
     # ./spec/integration/manage_todos_spec.rb:25:in `block (2 levels) in <top (required)>'

Finished in 0.27912 seconds
1 example, 1 failure

Failed examples:

rspec ./spec/integration/manage_todos_spec.rb:23 # Manage todos denote completed todos

Randomized with seed 61706

➜  todos git:(master) ✗ rspec spec/integration/manage_todos_spec.rb:23
WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.9.0
Run options: include {:locations=>{"./spec/integration/manage_todos_spec.rb"=>[23]}}
[deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
F

Failures:

  1) Manage todos denote completed todos
     Failure/Error: expect(page).to have_css 'li.todo.completed'
       expected css "li.todo.completed" to return something
     # ./spec/integration/manage_todos_spec.rb:31:in `block (2 levels) in <top (required)>'

Finished in 0.29148 seconds
1 example, 1 failure

Failed examples:

rspec ./spec/integration/manage_todos_spec.rb:23 # Manage todos denote completed todos

Randomized with seed 48061

➜  todos git:(master) ✗ rspec spec/integration/manage_todos_spec.rb:23
WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.9.0
Run options: include {:locations=>{"./spec/integration/manage_todos_spec.rb"=>[23]}}
[deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
F

Failures:

  1) Manage todos denote completed todos
     Failure/Error: expect(page).to have_css 'li.todo.completed'
       expected css "li.todo.completed" to return something
     # ./spec/integration/manage_todos_spec.rb:31:in `block (2 levels) in <top (required)>'

Finished in 0.29129 seconds
1 example, 1 failure

Failed examples:

rspec ./spec/integration/manage_todos_spec.rb:23 # Manage todos denote completed todos

Randomized with seed 57816

➜  todos git:(master) ✗ rspec spec/integration/manage_todos_spec.rb:23
WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.9.0
Run options: include {:locations=>{"./spec/integration/manage_todos_spec.rb"=>[23]}}
[deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
F

Failures:

  1) Manage todos denote completed todos
     Failure/Error: expect(page).to have_css 'li.todo.completed'
       expected css "li.todo.completed" to return something
     # ./spec/integration/manage_todos_spec.rb:31:in `block (2 levels) in <top (required)>'

Finished in 0.2939 seconds
1 example, 1 failure

Failed examples:

rspec ./spec/integration/manage_todos_spec.rb:23 # Manage todos denote completed todos

Randomized with seed 9038

➜  todos git:(master) ✗ rspec spec/integration/manage_todos_spec.rb:23
WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.9.0
Run options: include {:locations=>{"./spec/integration/manage_todos_spec.rb"=>[23]}}
[deprecated] I18n.enforce_available_locales will default to true in the future. If you really want to skip validation of your locale you can set I18n.enforce_available_locales = false to avoid this message.
F

Failures:

  1) Manage todos denote completed todos
     Failure/Error: expect(page).to have_css 'li.todo.completed'
       expected css "li.todo.completed" to return something
     # ./spec/integration/manage_todos_spec.rb:31:in `block (2 levels) in <top (required)>'

Finished in 0.291 seconds
1 example, 1 failure

Failed examples:

rspec ./spec/integration/manage_todos_spec.rb:23 # Manage todos denote completed todos

Randomized with seed 27598

➜  todos git:(master) ✗