Failed test expectation - ruby-on-rails

Question

I have a carts controller in my app
class CartsController < ApplicationController
def show
#cart = Cart.find(session[:cart_id])
#products = #cart.products
end
end
and wrote test cartscontroller_spec.rb
RSpec.describe CartsController, type: :controller do
describe 'GET #show' do
let(:cart_full_of){ create(:cart_with_products, products_count: 3)}
before do
get :show
end
it { expect(response.status).to eq(200) }
it { expect(response.headers["Content-Type"]).to eql("text/html; charset=utf-8")}
it { is_expected.to render_template :show }
it 'should be products in current cart' do
expect(assigns(:products)).to eq(cart_full_of.products)
end
end
end
My factories.rb looks such:
factory(:cart) do |f|
f.factory(:cart_with_products) do
transient do
products_count 5
end
after(:create) do |cart, evaluator|
create_list(:product, evaluator.products_count, carts: [cart])
end
end
end
factory(:product) do |f|
f.name('__product__')
f.description('__well-description__')
f.price(100500)
end
but I have got an error:
FCartsController GET #show should be products in current cart
Failure/Error: expect(assigns(:products)).to eq(cart_full_of.products)
expected: #<ActiveRecord::Associations::CollectionProxy [#<Product id: 41, name: "MyProduct", description: "Pro...dDescription", price: 111.0, created_at: "2016-11-24 11:18:43", updated_at: "2016-11-24 11:18:43">]>
got: #<ActiveRecord::Associations::CollectionProxy []>
Looks like I have no created products at all because of empty product model array ActiveRecord::Associations::CollectionProxy [], simultaneously, I investigate product`s id is increasing with every test attempt.At the moment I have no solid ideas that is wrong

Answer 1

The id of the created cart is not assigned to the session of your get :show.
before do
session[:cart_id] = cart_full_of.id
get :show
end
# or
before do
get :show, session: { cart_id: cart_full_of.id }
end
UPDATE:
Your find in the controller need the session[:cart_id] value, but your test didn't provide this data to the controller request. If you use one of the codes above the test request provides the session to the controller.