Fix system testing failure

https://travis-ci.org/rails/rails/jobs/486155626#L1317-L1335

1 files changed, 11 insertions, 8 deletions

diff --git a/actionpack/lib/action_dispatch/system_testing/browser.rb b/actionpack/lib/action_dispatch/system_testing/browser.rb
index f691bd5fe5..2ffb5f67f6 100644
--- a/actionpack/lib/action_dispatch/system_testing/browser.rb
+++ b/actionpack/lib/action_dispatch/system_testing/browser.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "selenium/webdriver"
+
 module ActionDispatch
   module SystemTesting
     class Browser # :nodoc:
@@ -30,18 +32,19 @@ module ActionDispatch
       end
 
       def capabilities
-        @option ||= case type
-                    when :chrome
-                      Selenium::WebDriver::Chrome::Options.new
-                    when :firefox
-                      Selenium::WebDriver::Firefox::Options.new
-        end
+        @option ||=
+          case type
+          when :chrome
+            Selenium::WebDriver::Chrome::Options.new
+          when :firefox
+            Selenium::WebDriver::Firefox::Options.new
+          end
       end
 
       private
         def headless_chrome_browser_options
-          capability.args << "--headless"
-          capability.args << "--disable-gpu" if Gem.win_platform?
+          capabilities.args << "--headless"
+          capabilities.args << "--disable-gpu" if Gem.win_platform?
 
           capabilities
         end