There's no need to do this

AS does the following inside Time.find_zone! ...
`ActiveSupport::TimeZone[time_zone] || TZInfo::Timezone.get(time_zone)`
and given that the test is stubbing AS::TZ[] we don't need the removed
code.

actionview/test/template/form_options_helper_test.rb

 require 'abstract_unit'
-require 'tzinfo'
 
 class Map < Hash
   def category
@@ -7,8 +6,6 @@ def category
   end
 end
 
-TZInfo::Timezone.cattr_reader :loaded_zones
-
 class FormOptionsHelperTest < ActionView::TestCase
   tests ActionView::Helpers::FormOptionsHelper
 
@@ -22,7 +19,7 @@ class FormOptionsHelperTest < ActionView::TestCase
 
   def setup
     @fake_timezones = %w(A B C D E).map do |id|
-      tz = TZInfo::Timezone.loaded_zones[id] = stub(:name => id, :to_s => id)
+      tz = stub(:name => id, :to_s => id)
       ActiveSupport::TimeZone.stubs(:[]).with(id).returns(tz)
       tz
     end