1 files changed, 4 insertions, 0 deletions
diff --git a/test/psych/test_coder.rb b/test/psych/test_coder.rb
index 0fa01ca3b6..c171c5ad0d 100644
--- a/test/psych/test_coder.rb
+++ b/test/psych/test_coder.rb
@@ -89,6 +89,10 @@ module Psych
       end
     end
 
+    def test_json_dump_exclude_tag
+      refute_match('TestCoder::InitApi', Psych.to_json(InitApi.new))
+    end
+
     def test_map_takes_block
       coder = Psych::Coder.new 'foo'
       tag = coder.tag