TimeZone offset tests: use current_period, to ensure TimeZone#utc_offset is up-to-date

activesupport/CHANGELOG

@@ -1,5 +1,7 @@
 *2.3.0/3.0*
 
+* TimeZone offset tests: use current_period, to ensure TimeZone#utc_offset is up-to-date [Geoff Buesing]
+
 * Update bundled TZInfo to 0.3.12 [Geoff Buesing]
 
 * Added lambda merging to OptionMerger (especially useful with named_scope and with_options) #726 [Paweł Kondzior]

activesupport/test/time_zone_test.rb

@@ -51,7 +51,7 @@ def test_from_duration_to_map
 
     define_method("test_utc_offset_for_#{name}") do
       silence_warnings do # silence warnings raised by tzinfo gem
-        period = zone.tzinfo.period_for_utc(Time.utc(2009,1,1,0,0,0))
+        period = zone.tzinfo.current_period
         assert_equal period.utc_offset, zone.utc_offset
       end
     end