diff --git a/test/ripper/test_parser_events.rb b/test/ripper/test_parser_events.rb
index d61dba340d..87bd0d4e0b 100644
--- a/test/ripper/test_parser_events.rb
+++ b/test/ripper/test_parser_events.rb
@@ -27,10 +27,12 @@ class TestRipper::ParserEvents < Test::Unit::TestCase
 
   def warning(str)
     parse(str, :warning) {|e, *args| return args}
+    assert(false, "warning expected")
   end
 
   def warn(str)
     parse(str, :warn) {|e, *args| return args}
+    assert(false, "warning expected")
   end
 
   def test_program