add #reload! to Simple backend

lib/i18n/backend/simple.rb

@@ -68,6 +68,11 @@ def localize(locale, object, format = :default)
       def initialized?
         @initialized ||= false
       end
+
+      def reload!
+        @initialized = false
+        @translations = nil
+      end
 
       protected
 

test/simple_backend_test.rb

@@ -470,4 +470,33 @@ def test_load_translations_loads_from_different_file_formats
     }
     assert_equal expected, backend_get_translations
   end
+end
+
+class I18nSimpleBackendReloadTranslationsTest < Test::Unit::TestCase
+  include I18nSimpleBackendTestSetup
+
+  def setup
+    @backend = I18n::Backend::Simple.new
+    I18n.load_path = [File.dirname(__FILE__) + '/locale/en-US.yml']
+    assert_nil backend_get_translations
+    @backend.send :init_translations
+  end
+
+  def teardown
+    I18n.load_path = []
+  end
+
+  def test_setup
+    assert_not_nil backend_get_translations
+  end
+
+  def test_reload_translations_unloads_translations
+    @backend.reload!
+    assert_nil backend_get_translations
+  end
+
+  def test_reload_translations_uninitializes_translations
+    @backend.reload!
+    assert_equal @backend.initialized?, false
+  end
 end