Switch from Poltergeist to headless Chrome

Poltergeist is no longer maintained
Rails 5.1 introduces ActionDispatch::SystemTestCase which should allow
our feature tests to be speed up when this is done:
rspec/rspec-rails#1813

Gemfile

@@ -54,8 +54,8 @@ group :test do
   gem 'capybara'
   gem 'database_cleaner'
   gem 'factory_girl_rails'
-  gem 'poltergeist'
   gem 'rails-controller-testing'
+  gem 'selenium-webdriver'
   gem 'webmock'
 end
 

Gemfile.lock

@@ -191,8 +191,9 @@ GEM
     carrierwave-aws (1.1.0)
       aws-sdk (~> 2.0)
       carrierwave (>= 0.7, < 2.0)
+    childprocess (0.7.0)
+      ffi (~> 1.0, >= 1.0.11)
     clipboard-rails (1.7.1)
-    cliver (0.3.2)
     coffee-rails (4.2.2)
       coffee-script (>= 2.2.0)
       railties (>= 4.0.0)
@@ -553,10 +554,6 @@ GEM
       peek
       sidekiq
     pg (0.21.0)
-    poltergeist (1.15.0)
-      capybara (~> 2.1)
-      cliver (~> 0.3.1)
-      websocket-driver (>= 0.2.0)
     posix-spawn (0.3.13)
     power_converter (0.1.2)
     powerpack (0.1.1)
@@ -733,6 +730,9 @@ GEM
       useragent
     select2-rails (3.5.10)
       thor (~> 0.14)
+    selenium-webdriver (3.4.2)
+      childprocess (~> 0.5)
+      rubyzip (~> 1.0)
     sidekiq (5.0.2)
       concurrent-ruby (~> 1.0)
       connection_pool (~> 2.2, >= 2.2.0)
@@ -881,7 +881,6 @@ DEPENDENCIES
   peek-redis
   peek-sidekiq
   pg
-  poltergeist
   puma (~> 3.7)
   rails (~> 5.1.1)
   rails-controller-testing
@@ -895,6 +894,7 @@ DEPENDENCIES
   sass-rails (~> 5.0)
   scss_lint
   secure_headers
+  selenium-webdriver
   sidekiq
   simplecov
   solr_wrapper (~> 1.0)

spec/rails_helper.rb

@@ -17,7 +17,6 @@
 require 'spec_helper'
 require 'rspec/rails'
 require 'capybara/rails'
-require 'capybara/poltergeist'
 require 'database_cleaner'
 require 'active_fedora/cleaner'
 
@@ -54,22 +53,20 @@
 
 # Uses faster rack_test driver when JavaScript support not needed
 Capybara.default_driver = :rack_test
-Capybara.javascript_driver = :poltergeist
-
-# Adding the below to deal with random Capybara-related timeouts in CI.
-# Found in this thread: https://github.com/teampoltergeist/poltergeist/issues/375
-poltergeist_options = {
-  js_errors: false,
-  timeout: 30,
-  logger: nil,
-  phantomjs_logger: StringIO.new,
-  phantomjs_options: [
-    '--load-images=no',
-    '--ignore-ssl-errors=yes'
-  ]
-}
-Capybara.register_driver(:poltergeist) do |app|
-  Capybara::Poltergeist::Driver.new(app, poltergeist_options)
+Capybara.javascript_driver = :headless_chromium
+
+Capybara.register_driver :headless_chromium do |app|
+  caps = Selenium::WebDriver::Remote::Capabilities.chrome(
+    "chromeOptions" => {
+      # 'binary' => "/chromium-latest-linux/466395/chrome-linux/chrome",
+      'args' => %w(headless no-sandbox disable-gpu)
+    }
+  )
+  Capybara::Selenium::Driver.new(
+    app,
+    browser: :chrome,
+    desired_capabilities: caps
+  )
 end
 
 RSpec.configure do |config|