1 files changed, 15 insertions, 1 deletions
diff --git a/actionmailer/test/mail_service_test.rb b/actionmailer/test/mail_service_test.rb
index 85fe3ad69b..f4de8c1894 100755
--- a/actionmailer/test/mail_service_test.rb
+++ b/actionmailer/test/mail_service_test.rb
@@ -156,7 +156,15 @@ class TestMailer < ActionMailer::Base
       p.part :content_type => "text/html", :body => "<b>test</b> HTML<br/>\nline #2"
     end
     attachment :content_type => "application/octet-stream",:filename => "test.txt", :body => "test abcdefghijklmnopqstuvwxyz"
-    
+  end
+
+  def unnamed_attachment(recipient)
+    recipients   recipient
+    subject      "nested multipart"
+    from         "test@example.com"
+    body         "multipart/mixed"
+    part :content_type => "text/plain", :body => "hullo"
+    attachment :content_type => "application/octet-stream", :body => "test abcdefghijklmnopqstuvwxyz"
   end
   
 
@@ -621,5 +629,11 @@ EOF
     mail = TMail::Mail.parse(fixture)
     assert_not_nil mail.from
   end
+
+  def test_empty_header_values_omitted
+    result = TestMailer.create_unnamed_attachment(@recipient).encoded
+    assert_match %r{Content-Type: application/octet-stream[^;]}, result
+    assert_match %r{Content-Disposition: attachment[^;]}, result
+  end
 end