```ruby
require 'test_helper'

class ProductsControllerTest < ActionController::TestCase
  setup do
    @product = products(:one)
      @update = {
        title: 'Lorem Ipsum',
        description: 'Wibbles are fun!',
        image_url: 'Lorem.jpg',
        price: 19.95
      }
  end

  test "should get index" do
    get :index
    assert_response :success
    assert_not_nil assigns(:products)
  end

  test "should get new" do
    get :new
    assert_response :success
  end

  test "should create product" do
    assert_difference('Product.count') do
      post :create, product: @update
    end

    assert_redirected_to product_path(assigns(:product))
  end

  test "should show product" do
    get :show, id: @product
    assert_response :success
  end

  test "should get edit" do
    get :edit, id: @product
    assert_response :success
  end

  test "should update product" do
    patch :update, id: @product, product: @update
    assert_redirected_to product_path(assigns(:product))
  end

  test "can't delete product in cart" do
    assert_difference('Product.count', 0) do
      delete :destroy, id: products(:ruby)
    end
 
    assert_redirected_to products_path
  end

  test "should destroy product" do
    assert_difference('Product.count', -1) do
      delete :destroy, id: @product
    end

    assert_redirected_to products_path
  end
end
```

Add 'should require login' test
user
```ruby
require 'test_helper'

class ProductsControllerTest < ActionController::TestCase
  setup do
    @product = products(:one)
      @update = {
        title: 'Lorem Ipsum',
        description: 'Wibbles are fun!',
        image_url: 'Lorem.jpg',
        price: 19.95
      }
  end

  test "should require login" do
    logout
    get :index
    assert_redirected_to login_path
  end

  test "should get index" do
    get :index
    assert_response :success
    assert_not_nil assigns(:products)
  end

  test "should get new" do
    get :new
    assert_response :success
  end

  test "should create product" do
    assert_difference('Product.count') do
      post :create, product: @update
    end

    assert_redirected_to product_path(assigns(:product))
  end

  test "should show product" do
    get :show, id: @product
    assert_response :success
  end

  test "should get edit" do
    get :edit, id: @product
    assert_response :success
  end

  test "should update product" do
    patch :update, id: @product, product: @update
    assert_redirected_to product_path(assigns(:product))
  end

  test "can't delete product in cart" do
    assert_difference('Product.count', 0) do
      delete :destroy, id: products(:ruby)
    end
 
    assert_redirected_to products_path
  end

  test "should destroy product" do
    assert_difference('Product.count', -1) do
      delete :destroy, id: @product
    end

    assert_redirected_to products_path
  end
end
```
assistant