Removing :en in favor of I18n.default_locale in duration#inspect

Hi there,

i have an app without english as available locale. So i got an error when we try to inspect something like 1.day. This is done automatically when we use the dalli cache.

I would like to change the :en to ::I18n.default_locale to be sure that this is always constant and is an available locale.

Tests are all green with this change.

Calculating -------------------------------------
:locale => :en                              2.024k i/100ms
:locale => ::I18n.default_locale   2.236k i/100ms
-------------------------------------------------
:locale => :en                                  25.758k (±26.3%) i/s -    117.392k
:locale => ::I18n.default_locale       26.311k (±18.1%) i/s -    127.452k

1 files changed, 9 insertions, 0 deletions

diff --git a/activesupport/test/core_ext/duration_test.rb b/activesupport/test/core_ext/duration_test.rb
index 2b893c7cd0..c283b546e6 100644
--- a/activesupport/test/core_ext/duration_test.rb
+++ b/activesupport/test/core_ext/duration_test.rb
@@ -70,6 +70,15 @@ class DurationTest < ActiveSupport::TestCase
     assert_equal '14 days',                         1.fortnight.inspect
   end
 
+  def test_inspect_locale
+    current_locale = I18n.default_locale
+    I18n.default_locale = :de
+    I18n.backend.store_translations(:de, { support: { array: { last_word_connector: ' und ' } } })
+    assert_equal '10 years, 1 month und 1 day', (10.years + 1.month  + 1.day).inspect
+  ensure
+    I18n.default_locale = current_locale
+  end
+
   def test_minus_with_duration_does_not_break_subtraction_of_date_from_date
     assert_nothing_raised { Date.today - Date.today }
   end