Testing custom devise session controller using RSpec - ruby-on-rails-4

Question

I'm using a custom Devise SessionsController:
#custom_sessions_controller.rb
class CustomSessionsController < Devise::SessionsController
end
In my routes.rb devise is set up like this:
#routes.rb
devise_for :custom_users, {
:singular => 'custom_user',
:class_name => 'CustomUser',
:path => "/",
:path_names => { :sign_in => 'login', :sign_out => 'logout' },
:controllers => { :sessions => "custom_sessions" }
}
I would like to write a simple rspec test:
#custom_sessions_controller_spec.rb
require 'rails_helper'
describe CustomSessionsController, :type => :controller do
describe "login" do
before do
setup_controller_for_warden
#request.env["devise.mapping"] = Devise.mappings[:custom_user]
#my_user = FactoryGirl.create(:custom_user) # creates user with valid credentials
end
it "should succeed with valid credentials" do
sign_in #my_user
curr_user = assigns(:current_custom_user)
expect(curr_user).to eq(#my_user)
expect(response).to be_success
end
end
end
In my rails_helper.rb the following lines are present:
require 'devise'
...
RSpec.configure do |config|
...
config.include Devise::TestHelpers, :type => :controller
config.include Warden::Test::Helpers , :type => :controller
...
The problem is that curr_user in the test is alway nil. What am I doing wrong? Or how to test a custom devise session controller? Or how to log in in - other - tests using a custom devise session?

Answer 1

instead of:
describe CustomSessionsController, :type => :controller do
try:
RSpec.describe CustomSessionsController, :type => :controller do
Hope it works!

Answer 2

Using
#controller.current_custom_user
instead of
assigns(:current_custom_user)
seems to work.