Replace poltergeist with capybara-selenium

Fix CI Failures by executing feature tests against a headless Chrome
browser instead of PhantomJS.

Configure CI to use the `chrome` stable addon. Add a step to
`bin/setup_ci` to install `chromedriver`.

.travis.yml

@@ -1,5 +1,7 @@
 language: ruby
-sudo: false
+sudo: required
+addons:
+  chrome: stable
 cache:
   - bundler
 notifications:

bin/setup_ci

@@ -2,6 +2,15 @@
 
 set -e
 
+install_chromedriver() {
+  wget -N http://chromedriver.storage.googleapis.com/2.30/chromedriver_linux64.zip -P ~/
+  unzip ~/chromedriver_linux64.zip -d ~/
+  rm -v ~/chromedriver_linux64.zip
+  sudo mv -v -f ~/chromedriver /usr/local/share/
+  sudo chmod -v +x /usr/local/share/chromedriver
+  sudo ln -v -s /usr/local/share/chromedriver /usr/local/bin/chromedriver
+}
+
 rm -rf ~/.nvm
 
 git clone https://github.com/creationix/nvm.git ~/.nvm
@@ -20,4 +29,6 @@ node --version
 
 gem update --system
 
+install_chromedriver
+
 source bin/setup

ember-cli-rails.gemspec

@@ -24,5 +24,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "generator_spec", "~> 0.9.0"
   spec.add_development_dependency "rspec-rails", "~> 3.6.0"
 
+  spec.add_development_dependency "capybara-selenium"
   spec.add_development_dependency "codeclimate-test-reporter", "~> 0.6.0"
 end

spec/spec_helper.rb

@@ -4,13 +4,11 @@
 ENV["RAILS_ENV"] = "test"
 
 require "dummy/application"
-
 require "rspec/rails"
-require "capybara/poltergeist"
 
 Dummy::Application.initialize!
 
-Dir[Rails.root.join("spec/support/**/*.rb")].sort.each { |file| require file }
+Dir["spec/support/**/*.rb"].sort.each { |file| require "./#{file}" }
 
 RSpec.configure do |config|
   config.expect_with :rspec do |expectations|
@@ -26,5 +24,3 @@
   config.infer_spec_type_from_file_location!
   config.order = :random
 end
-
-Capybara.javascript_driver = :poltergeist

spec/support/capybara.rb

@@ -0,0 +1,19 @@
+require "selenium/webdriver"
+
+Capybara.register_driver :chrome do |app|
+  Capybara::Selenium::Driver.new(app, browser: :chrome)
+end
+
+Capybara.register_driver :headless_chrome do |app|
+  capabilities = Selenium::WebDriver::Remote::Capabilities.chrome(
+    chromeOptions: { args: %w(headless disable-gpu) },
+  )
+
+  Capybara::Selenium::Driver.new(
+    app,
+    browser: :chrome,
+    desired_capabilities: capabilities,
+  )
+end
+
+Capybara.javascript_driver = :headless_chrome