Revert #default_separator on base test case

Clean teardown methods a bit by relying on the base test case.

Author: carlosantoniodasilva

test/gettext/backend_test.rb

@@ -17,14 +17,7 @@ def setup
       I18n.backend = Backend.new
       I18n.locale = :en
       I18n.load_path = ["#{locales_dir}/de.po"]
-      @old_separator, I18n.default_separator = I18n.default_separator, '|'
-    end
-
-    def teardown
-      I18n.load_path = nil
-      I18n.backend = nil
-      I18n.default_separator = @old_separator
-      super
+      I18n.default_separator = '|'
     end
 
     def test_backend_loads_po_file

test/locale/fallbacks_test.rb

@@ -3,11 +3,6 @@
 include I18n::Locale
 
 class I18nFallbacksDefaultsTest < I18n::TestCase
-  def teardown
-    I18n.default_locale = :en
-    super
-  end
-
   test "defaults reflect the I18n.default_locale if no default has been set manually" do
     I18n.default_locale = :'en-US'
     fallbacks = Fallbacks.new

test/test_helper.rb

@@ -49,10 +49,11 @@ def setup
 
   def teardown
     I18n.locale = nil
-    I18n.default_locale = :en
-    I18n.load_path = []
+    I18n.default_locale = nil
+    I18n.load_path = nil
     I18n.available_locales = nil
     I18n.backend = nil
+    I18n.default_separator = nil
     I18n.enforce_available_locales = true
     super
   end