Extract out with_env_tz helper method.

It’s used at so many places that extracting it out into a helper file
is worth doing.

activesupport/test/core_ext/date_ext_test.rb

 require 'abstract_unit'
 require 'active_support/time'
 require 'core_ext/date_and_time_behavior'
+require 'time_zone_test_helpers'
 
 class DateExtCalculationsTest < ActiveSupport::TestCase
   def date_time_init(year,month,day,*args)
@@ -8,6 +9,7 @@ def date_time_init(year,month,day,*args)
   end
 
   include DateAndTimeBehavior
+  include TimeZoneTestHelpers
 
   def test_yesterday_in_calendar_reform
     assert_equal Date.new(1582,10,4), Date.new(1582,10,15).yesterday
@@ -349,22 +351,6 @@ def test_date_advance_should_not_change_passed_options_hash
     Date.new(2005,2,28).advance(options)
     assert_equal({ :years => 3, :months => 11, :days => 2 }, options)
   end
-
-  protected
-    def with_env_tz(new_tz = 'US/Eastern')
-      old_tz, ENV['TZ'] = ENV['TZ'], new_tz
-      yield
-    ensure
-      old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
-    end
-
-    def with_tz_default(tz = nil)
-      old_tz = Time.zone
-      Time.zone = tz
-      yield
-    ensure
-      Time.zone = old_tz
-    end
 end
 
 class DateExtBehaviorTest < ActiveSupport::TestCase

activesupport/test/core_ext/date_time_ext_test.rb

 require 'abstract_unit'
 require 'active_support/time'
 require 'core_ext/date_and_time_behavior'
+require 'time_zone_test_helpers'
 
 class DateTimeExtCalculationsTest < ActiveSupport::TestCase
   def date_time_init(year,month,day,hour,minute,second,*args)
@@ -8,6 +9,7 @@ def date_time_init(year,month,day,hour,minute,second,*args)
   end
 
   include DateAndTimeBehavior
+  include TimeZoneTestHelpers
 
   def test_to_s
     datetime = DateTime.new(2005, 2, 21, 14, 30, 0, 0)
@@ -352,12 +354,4 @@ def test_nsec
     assert_equal 0, DateTime.civil(2000).nsec
     assert_equal 500000000, DateTime.civil(2000, 1, 1, 0, 0, Rational(1,2)).nsec
   end
-
-  protected
-    def with_env_tz(new_tz = 'US/Eastern')
-      old_tz, ENV['TZ'] = ENV['TZ'], new_tz
-      yield
-    ensure
-      old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
-    end
 end

activesupport/test/core_ext/duration_test.rb

@@ -2,8 +2,11 @@
 require 'active_support/inflector'
 require 'active_support/time'
 require 'active_support/json'
+require 'time_zone_test_helpers'
 
 class DurationTest < ActiveSupport::TestCase
+  include TimeZoneTestHelpers
+
   def test_is_a
     d = 1.day
     assert d.is_a?(ActiveSupport::Duration)
@@ -167,12 +170,4 @@ def test_case_when
     cased = case 1.day when 1.day then "ok" end
     assert_equal cased, "ok"
   end
-
-  protected
-    def with_env_tz(new_tz = 'US/Eastern')
-      old_tz, ENV['TZ'] = ENV['TZ'], new_tz
-      yield
-    ensure
-      old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
-    end
 end

activesupport/test/core_ext/numeric_ext_test.rb

@@ -71,14 +71,6 @@ def test_add_one_year_to_leap_day
     assert_equal Time.utc(2005,2,28,15,15,10), Time.utc(2004,2,29,15,15,10) + 1.year
     assert_equal DateTime.civil(2005,2,28,15,15,10), DateTime.civil(2004,2,29,15,15,10) + 1.year
   end
-
-  protected
-    def with_env_tz(new_tz = 'US/Eastern')
-      old_tz, ENV['TZ'] = ENV['TZ'], new_tz
-      yield
-    ensure
-      old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
-    end
 end
 
 class NumericExtDateTest < ActiveSupport::TestCase

activesupport/test/core_ext/string_ext_test.rb

@@ -10,10 +10,12 @@
 require 'active_support/core_ext/string/strip'
 require 'active_support/core_ext/string/output_safety'
 require 'active_support/core_ext/string/indent'
+require 'time_zone_test_helpers'
 
 class StringInflectionsTest < ActiveSupport::TestCase
   include InflectorTestCases
   include ConstantizeTestCases
+  include TimeZoneTestHelpers
 
   def test_strip_heredoc_on_an_empty_string
     assert_equal '', ''.strip_heredoc
@@ -354,6 +356,8 @@ class StringAccessTest < ActiveSupport::TestCase
 end
 
 class StringConversionsTest < ActiveSupport::TestCase
+  include TimeZoneTestHelpers
+
   def test_string_to_time
     with_env_tz "Europe/Moscow" do
       assert_equal Time.utc(2005, 2, 27, 23, 50), "2005-02-27 23:50".to_time(:utc)
@@ -523,14 +527,6 @@ def test_string_to_date
     assert_nil "".to_date
     assert_equal Date.new(Date.today.year, 2, 3), "Feb 3rd".to_date
   end
-
-  protected
-    def with_env_tz(new_tz = 'US/Eastern')
-      old_tz, ENV['TZ'] = ENV['TZ'], new_tz
-      yield
-    ensure
-      old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
-    end
 end
 
 class StringBehaviourTest < ActiveSupport::TestCase

activesupport/test/core_ext/time_ext_test.rb

 require 'abstract_unit'
 require 'active_support/time'
 require 'core_ext/date_and_time_behavior'
+require 'time_zone_test_helpers'
 
 class TimeExtCalculationsTest < ActiveSupport::TestCase
   def date_time_init(year,month,day,hour,minute,second,usec=0)
@@ -8,6 +9,7 @@ def date_time_init(year,month,day,hour,minute,second,usec=0)
   end
 
   include DateAndTimeBehavior
+  include TimeZoneTestHelpers
 
   def test_seconds_since_midnight
     assert_equal 1,Time.local(2005,1,1,0,0,1).seconds_since_midnight
@@ -847,15 +849,6 @@ def test_all_quarter
   def test_all_year
     assert_equal Time.local(2011,1,1,0,0,0)..Time.local(2011,12,31,23,59,59,Rational(999999999, 1000)), Time.local(2011,6,7,10,10,10).all_year
   end
-
-  protected
-    def with_env_tz(new_tz = 'US/Eastern')
-      old_tz, ENV['TZ'] = ENV['TZ'], new_tz
-      yield
-    ensure
-      old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
-    end
-
 end
 
 class TimeExtMarshalingTest < ActiveSupport::TestCase

activesupport/test/core_ext/time_with_zone_test.rb

 require 'abstract_unit'
 require 'active_support/time'
+require 'time_zone_test_helpers'
 
 class TimeWithZoneTest < ActiveSupport::TestCase
+  include TimeZoneTestHelpers
 
   def setup
     @utc = Time.utc(2000, 1, 1, 0)
@@ -810,23 +812,17 @@ def test_no_method_error_has_proper_context
     assert_equal "undefined method `this_method_does_not_exist' for Fri, 31 Dec 1999 19:00:00 EST -05:00:Time", e.message
     assert_no_match "rescue", e.backtrace.first
   end
-
-  protected
-    def with_env_tz(new_tz = 'US/Eastern')
-      old_tz, ENV['TZ'] = ENV['TZ'], new_tz
-      yield
-    ensure
-      old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
-    end
 end
 
 class TimeWithZoneMethodsForTimeAndDateTimeTest < ActiveSupport::TestCase
+  include TimeZoneTestHelpers
+
   def setup
-    @t, @dt = Time.utc(2000), DateTime.civil(2000)
+    @t, @dt, @zone = Time.utc(2000), DateTime.civil(2000), Time.zone
   end
 
   def teardown
-    Time.zone = nil
+    Time.zone = @zone
   end
 
   def test_in_time_zone
@@ -882,8 +878,6 @@ def test_in_time_zone_with_time_local_instance
   def test_localtime
     Time.zone = ActiveSupport::TimeZone['Eastern Time (US & Canada)']
     assert_equal @dt.in_time_zone.localtime, @dt.in_time_zone.utc.to_time.getlocal
-  ensure
-    Time.zone = nil
   end
 
   def test_use_zone
@@ -922,6 +916,7 @@ def test_time_zone_getter_and_setter
   end
 
   def test_time_zone_getter_and_setter_with_zone_default_set
+    old_zone_default = Time.zone_default
     Time.zone_default = ActiveSupport::TimeZone['Alaska']
     assert_equal ActiveSupport::TimeZone['Alaska'], Time.zone
     Time.zone = ActiveSupport::TimeZone['Hawaii']
@@ -929,8 +924,7 @@ def test_time_zone_getter_and_setter_with_zone_default_set
     Time.zone = nil
     assert_equal ActiveSupport::TimeZone['Alaska'], Time.zone
   ensure
-    Time.zone = nil
-    Time.zone_default = nil
+    Time.zone_default = old_zone_default
   end
 
   def test_time_zone_setter_is_thread_safe
@@ -1002,8 +996,6 @@ def test_current_returns_time_zone_now_when_zone_set
       assert_equal 'Eastern Time (US & Canada)', Time.current.time_zone.name
       assert_equal Time.utc(2000), Time.current.time
     end
-  ensure
-    Time.zone = nil
   end
 
   def test_time_in_time_zone_doesnt_affect_receiver
@@ -1014,25 +1006,15 @@ def test_time_in_time_zone_doesnt_affect_receiver
       assert_not time.utc?, 'time expected to be local, but is UTC'
     end
   end
-
-  protected
-    def with_env_tz(new_tz = 'US/Eastern')
-      old_tz, ENV['TZ'] = ENV['TZ'], new_tz
-      yield
-    ensure
-      old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
-    end
 end
 
 class TimeWithZoneMethodsForDate < ActiveSupport::TestCase
+  include TimeZoneTestHelpers
+
   def setup
     @d = Date.civil(2000)
   end
 
-  def teardown
-    Time.zone = nil
-  end
-
   def test_in_time_zone
     with_tz_default 'Alaska' do
       assert_equal 'Sat, 01 Jan 2000 00:00:00 AKST -09:00', @d.in_time_zone.inspect
@@ -1065,28 +1047,17 @@ def test_in_time_zone_with_invalid_argument
     assert_raise(ArgumentError) { @d.in_time_zone(-15.hours) }
     assert_raise(ArgumentError) { @d.in_time_zone(Object.new) }
   end
-
-  protected
-    def with_tz_default(tz = nil)
-      old_tz = Time.zone
-      Time.zone = tz
-      yield
-    ensure
-      Time.zone = old_tz
-    end
 end
 
 class TimeWithZoneMethodsForString < ActiveSupport::TestCase
+  include TimeZoneTestHelpers
+
   def setup
     @s = "Sat, 01 Jan 2000 00:00:00"
     @u = "Sat, 01 Jan 2000 00:00:00 UTC +00:00"
     @z = "Fri, 31 Dec 1999 19:00:00 EST -05:00"
   end
 
-  def teardown
-    Time.zone = nil
-  end
-
   def test_in_time_zone
     with_tz_default 'Alaska' do
       assert_equal 'Sat, 01 Jan 2000 00:00:00 AKST -09:00', @s.in_time_zone.inspect
@@ -1141,13 +1112,4 @@ def test_in_time_zone_with_invalid_argument
     assert_raise(ArgumentError) { @u.in_time_zone(Object.new) }
     assert_raise(ArgumentError) { @z.in_time_zone(Object.new) }
   end
-
-  protected
-    def with_tz_default(tz = nil)
-      old_tz = Time.zone
-      Time.zone = tz
-      yield
-    ensure
-      Time.zone = old_tz
-    end
 end

activesupport/test/json/encoding_test.rb

@@ -4,8 +4,11 @@
 require 'active_support/core_ext/string/inflections'
 require 'active_support/json'
 require 'active_support/time'
+require 'time_zone_test_helpers'
 
 class TestJSONEncoding < ActiveSupport::TestCase
+  include TimeZoneTestHelpers
+
   class Foo
     def initialize(a, b)
       @a, @b = a, b
@@ -530,13 +533,6 @@ def object_keys(json_object)
       json_object[1..-2].scan(/([^{}:,\s]+):/).flatten.sort
     end
 
-    def with_env_tz(new_tz = 'US/Eastern')
-      old_tz, ENV['TZ'] = ENV['TZ'], new_tz
-      yield
-    ensure
-      old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
-    end
-
     def with_standard_json_time_format(boolean = true)
       old, ActiveSupport.use_standard_json_time_format = ActiveSupport.use_standard_json_time_format, boolean
       yield

activesupport/test/time_zone_test.rb

 require 'abstract_unit'
 require 'active_support/time'
+require 'time_zone_test_helpers'
 
 class TimeZoneTest < ActiveSupport::TestCase
+  include TimeZoneTestHelpers
+
   def test_utc_to_local
     zone = ActiveSupport::TimeZone['Eastern Time (US & Canada)']
     assert_equal Time.utc(1999, 12, 31, 19), zone.utc_to_local(Time.utc(2000, 1)) # standard offset -0500
@@ -416,12 +419,4 @@ def test_us_zones
     assert ActiveSupport::TimeZone.us_zones.include?(ActiveSupport::TimeZone["Hawaii"])
     assert !ActiveSupport::TimeZone.us_zones.include?(ActiveSupport::TimeZone["Kuala Lumpur"])
   end
-
-  protected
-    def with_env_tz(new_tz = 'US/Eastern')
-      old_tz, ENV['TZ'] = ENV['TZ'], new_tz
-      yield
-    ensure
-      old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
-    end
 end

activesupport/test/time_zone_test_helpers.rb

+module TimeZoneTestHelpers
+  def with_tz_default(tz = nil)
+    old_tz = Time.zone
+    Time.zone = tz
+    yield
+  ensure
+    Time.zone = old_tz
+  end
+
+  def with_env_tz(new_tz = 'US/Eastern')
+    old_tz, ENV['TZ'] = ENV['TZ'], new_tz
+    yield
+  ensure
+    old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
+  end
+end