Testing Devise - Capybara::ElementNotFound: Unable to find xpath "/html"

Question

I'm trying to test the login functionality of my website with RSpec, Capybara and Factory Girl. I always get the following error in the terminal but couldn't find any solution to this. When I use save_and_open_page I get a blank page. I hope someone knows what's wrong. Thanks!

Here is the test output

Failure/Error: expect(page).to have_text("Login successful.")
     Capybara::ElementNotFound:
       Unable to find xpath "/html"
     # ./spec/features/navigation_spec.rb:49:in `block (2 levels) in <top (required)>'

Here is my sometest_spec.rb file with the corresponding lines:

require 'spec_helper'
include Warden::Test::Helpers

describe "User login" do
  it "log in normal user" do

    Warden.test_mode!

    user = create(:normal_user)
    user.confirmed_at = Time.now
    user.save
    login_as(user, scope: :user)

    expect(page).to have_text("Login successful.")

    logout(:user)
    Warden.test_reset!
  end
end

Here is my factory_girl.rb file

RSpec.configure do |config|
  config.include FactoryGirl::Syntax::Methods
end

And the factories.rb file

FactoryGirl.define do
  factory :normal_user, class: User do
    firstname "John"
    lastname "Doe"
    email "test@user.com"
    password "thepassword"
    admin false
  end
end

Answer 1

It turns out I have to manually visit a_path after the login_as to see the additional login page content.