Fix test in isolation

The test was calling `auth_param` that then called `second` in an array,
but that method was not being required.

Author: rafaelfranca

actionpack/lib/action_controller/metal/http_authentication.rb

@@ -2,6 +2,7 @@
 
 require "base64"
 require "active_support/security_utils"
+require "active_support/core_ext/array/access"
 
 module ActionController
   # HTTP Basic, Digest and Token authentication.