1 files changed, 25 insertions, 0 deletions
diff --git a/test/psych/test_string.rb b/test/psych/test_string.rb
index cffc12163b..c7d5c60623 100644
--- a/test/psych/test_string.rb
+++ b/test/psych/test_string.rb
@@ -2,6 +2,31 @@ require 'psych/helper'
 
 module Psych
   class TestString < TestCase
+    class X < String
+    end
+
+    class Y < String
+      attr_accessor :val
+    end
+
+    def test_backwards_with_syck
+      x = Psych.load "--- !str:#{X.name} foo\n\n"
+      assert_equal X, x.class
+      assert_equal 'foo', x
+    end
+
+    def test_empty_subclass
+      assert_match "!ruby/string:#{X}", Psych.dump(X.new)
+      x = Psych.load Psych.dump X.new
+      assert_equal X, x.class
+    end
+
+    def test_subclass_with_attributes
+      y = Psych.load Psych.dump Y.new.tap {|y| y.val = 1}
+      assert_equal Y, y.class
+      assert_equal 1, y.val
+    end
+
     def test_string_with_base_60
       yaml = Psych.dump '01:03:05'
       assert_match "'01:03:05'", yaml