Make sure ActionMailer use default charset if no defined by current locale

actionmailer/lib/action_mailer/base.rb

@@ -346,10 +346,10 @@ class Base
 
     # Specify the charset to use for the message.
     # It performs a lookup, on the specified charset, then on the charset from
-    # the current locale, and, finally, on the +default_charset+ specified
+    # the current locale, and, in the end, on the +default_charset+ specified
     # for ActionMailer::Base.
     def charset(charset = nil)
-      @charset ||= charset || I18n.translate(:charset) || @@default_charset
+      @charset ||= charset || I18n.translate(:charset, :default => @@default_charset)
     end
     attr_writer :charset
     

actionmailer/test/i18n_test.rb

@@ -59,28 +59,26 @@ def test_should_use_locale_charset
   end
   
   def test_should_use_default_charset_if_no_current_locale
-    uses_locale nil do
+    with_locale nil do
       assert_equal @charset, mail.charset
     end
   end
   
   def test_mail_headers_should_contains_current_charset
-    uses_locale 'de-DE' do
+    with_locale 'de-DE' do
       assert_match /iso-8859-1/, mail.header['content-type'].body
     end
   end
   
   def test_should_use_charset_from_current_locale
-    uses_locale 'de-DE' do
+    with_locale 'de-DE' do
       assert_equal 'iso-8859-1', mail.charset
     end
   end
 
-  def test_should_raise_exception_if_current_locale_doesnt_specify_a_charset
-    assert_raise I18n::MissingTranslationData do
-      uses_locale 'en-GB' do
-        mail
-      end
+  def test_should_use_default_charset_if_missing_for_current_locale
+    with_locale 'en-GB' do
+      assert_equal @charset, mail.charset
     end
   end
     
@@ -89,7 +87,7 @@ def test_should_use_explicit_charset
   end
   
   def test_mail_parts_charsets
-    uses_locale 'de-DE' do
+    with_locale 'de-DE' do
       charsets = mail('multiparted').parts.map(&:charset)
       assert_equal 'iso-8859-1', charsets[0]
       assert_equal 'iso-8859-1', charsets[1]
@@ -98,7 +96,7 @@ def test_mail_parts_charsets
   end
   
   def test_mail_parts_headers
-    uses_locale 'de-DE' do
+    with_locale 'de-DE' do
       content_types = mail('multiparted').parts.map(&:header).map do |header|
         header['content-type'].body
       end
@@ -111,7 +109,7 @@ def test_mail_parts_headers
   # TODO: this case depends on XML Builder,
   # should we pass Builder::XmlMarkup.new :encoding => charset_from_i18n ?
   def _ignore_test_rxml_template_should_use_current_charset
-    uses_locale 'de-DE' do
+    with_locale 'de-DE' do
       assert_equal "<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>\n<test/>",
         mail('rxml_template').body.strip
     end
@@ -122,7 +120,7 @@ def mail(method = 'use_locale_charset')
       I18nMailer.__send__('create_' + method, @recipient)
     end
     
-    def uses_locale(locale, &block)
+    def with_locale(locale, &block)
       begin
         I18n.locale = locale
         yield