initialize': rack-test requires a rack application, but none was given (ArgumentError)

Question

I keep getting this error while switching from Selenium over to PhantomJs/Poltergeist. Anybody know what I'm doing wrong? If I switch out the driver to selenium, the script works perfectly. Whenever I comment out the default_driver = :selenium and replace with javascript_driver = :poltergeist I run into this error.

initialize': rack-test requires a rack application, but none was given (ArgumentError)

This is all in a ruby file, no rails.

require 'rubygems'
require 'capybara'
require 'capybara/dsl'
require "open-uri"
# require "date"
# require 'active_support/core_ext/integer/inflections'
require 'capybara/poltergeist'
# require 'selenium-webdriver'
require 'pry'
require 'phantomjs'
# require 'database_cleaner'
Capybara.run_server = false
Capybara.javascript_driver = :poltergeist
# Capybara.default_driver = :selenium
Capybara.app_host = 'https://www.sameplsite.com'
module MyCapybaraTest
 class Test
 include Capybara::DSL
 def login_site
 visit('https://www.sameplsite.com')
 # binding.pry
 click_link('Log in')
 fill_in('email', :with => '[email protected]')
 fill_in('password', :with => 'passwordpassword')
 check('checkbox_remember')
 click_button('Log in')
 end
 def click_right_game
 click_link('Create Contest')
 all('.boxed')[1].click
 check('Free practice')
 click_link('Create 1 Head-to-Head')
 save_and_open_page
 end
 def output_game_link
 url = URI.parse(current_url)
 puts url
 end
 end
end
t = MyCapybaraTest::Test.new
t.login_fanduel
t.click_right_game
t.output_game_link

Answer 1

Capybara.javascript_driver = :poltergeist doesn't switch the driver. If you want to switch driver , use Capybara.current_driver instead. That says : Capybara.current_driver = :poltergeist