Make capybara drivers configurable via metadata

Gemfile

@@ -12,6 +12,8 @@ gem 'solidus_auth_devise', '~> 1.0'
 
 group :development, :test do
   gem "pry-rails"
+  gem "selenium-webdriver"
+  gem "chromedriver-helper"
 end
 
 gemspec

spec/spec_helper.rb

@@ -41,7 +41,9 @@
   # Paypal requires TLS v1.2 for ssl connections
   Capybara::Poltergeist::Driver.new(app, { phantomjs_options: ['--ssl-protocol=tlsv1.2'] })
 end
-Capybara.javascript_driver = :poltergeist
+Capybara.register_driver :chrome do |app|
+  Capybara::Selenium::Driver.new(app, browser: :chrome)
+end
 
 VCR.configure do |c|
   c.cassette_library_dir = "spec/fixtures/cassettes"
@@ -91,6 +93,10 @@ def create_gateway(opts = {})
   config.include Spree::TestingSupport::UrlHelpers
   config.include BraintreeHelpers
 
+  config.before(:each, type: :feature, js: true) do |ex|
+    Capybara.current_driver = ex.metadata[:driver] || :poltergeist
+  end
+
   config.before :suite do
     DatabaseCleaner.strategy = :transaction
     DatabaseCleaner.clean_with :truncation