five.sh

LOCAL_IP="$(ifconfig eth0 | grep "inet " | awk -F'[: ]+' '{ print $4 }')" \
SELENIUM_URL=http://firefox-browser:4444 \
RAILS_ENV=test \
rspec spec/integrations/login_spec.rb

four.rb

scenario "Displaying sign in dialogue", js: true do
  setup_driver

  visit root_path
  click_link "Sign in"
  expect(page).to have_selector('input#username')
end

one.rb

scenario "Displaying sign in dialogue", js: true do
  visit root_path
  click_link "Sign in"
  expect(page).to have_selector('input#username')
end

three.rb

Capybara.register_driver :docker_firefox do |app|

  Capybara::Selenium::Driver.new(app, {
    browser: :remote,
    url: "#{ENV['SELENIUM_URL']}/wd/hub",
    desired_capabilities: Selenium::WebDriver::Remote::Capabilities.firefox
  })
end

def setup_driver
  unless ENV['SELENIUM_URL'].nil? || ENV['SELENIUM_URL'].empty?
    Capybara.current_driver = :docker_firefox
    Capybara.javascript_driver = :docker_firefox
    Capybara.server_port = 55555
    Capybara.server_host = "#{ENV['LOCAL_IP']}"
    Capybara.app_host = "http://#{ENV['LOCAL_IP']}:#{Capybara.server_port}"
  end
end

two.yml

firefox:
  image: selenium/standalone-firefox:2.48.2
  container_name: firefox-browser
  net: demo-network
rails:
  build: .
  container_name: demo-app
  volumes:
    - ".:/demo-app"
  command: /bin/bash -l scripts/start-tests.sh
  ports:
    - "3000:3000"
  net: demo-network