diff --git a/test/unit/ticket_trigger_test.rb b/test/unit/ticket_trigger_test.rb
index 2a18340f8..f2c68cacc 100644
--- a/test/unit/ticket_trigger_test.rb
+++ b/test/unit/ticket_trigger_test.rb
@@ -4282,6 +4282,8 @@ class TicketTriggerTest < ActiveSupport::TestCase
     assert_match('smith@example.com', article1.to)
     assert_match('Thanks for your inquiry (aaäöüßad asd)!', article1.subject)
     assert_match(/.+cid:.+?@zammad.example.com.+/, article1.body)
+    assert_equal(1, article1.attachments.count)
+    assert_equal('789', article1.attachments[0].size)
     assert_equal('text/html', article1.content_type)
   end
 end