1 files changed, 8 insertions, 0 deletions
diff --git a/test/psych/test_deprecated.rb b/test/psych/test_deprecated.rb
index e77d18c10c..41106ffcfd 100644
--- a/test/psych/test_deprecated.rb
+++ b/test/psych/test_deprecated.rb
@@ -139,5 +139,13 @@ module Psych
       assert_equal 'some string', coder.scalar
       assert_equal :scalar, coder.type
     end
+
+    class YamlAs
+      yaml_as 'helloworld'
+    end
+
+    def test_yaml_as
+      assert_match(/helloworld/, Psych.dump(YamlAs.new))
+    end
   end
 end