From 0016edbead23f2a9b4fa17bcec2798b5bf6a4c07 Mon Sep 17 00:00:00 2001
From: Jordan Owens <jkowens@gmail.com>
Date: Wed, 16 Jan 2019 00:29:12 -0500
Subject: Add test to demonstrate issue deserializing hash with ivar

Currently the elements of a hash are revived before any ivar values.
This causes an issue when the `[]=` method references an instance
variable.
---
 test/psych/test_hash.rb | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'test/psych')

diff --git a/test/psych/test_hash.rb b/test/psych/test_hash.rb
index e93aa73249..2a563da1da 100644
--- a/test/psych/test_hash.rb
+++ b/test/psych/test_hash.rb
@@ -6,6 +6,18 @@ module Psych
     class X < Hash
     end
 
+    class HashWithIvar < Hash
+      def initialize
+        @keys = []
+        super
+      end
+
+      def []=(k, v)
+        @keys << k
+        super(k, v)
+      end
+    end
+
     class HashWithCustomInit < Hash
       attr_reader :obj
       def initialize(obj)
@@ -24,6 +36,14 @@ module Psych
       @hash = { :a => 'b' }
     end
 
+    def test_hash_with_ivar
+      t1 = HashWithIvar.new
+      t1[:foo] = :bar
+      t2 = Psych.load(Psych.dump(t1))
+      assert_equal t1, t2
+      assert_cycle t1
+    end
+
     def test_referenced_hash_with_ivar
       a = [1,2,3,4,5]
       t1 = [HashWithCustomInit.new(a)]
-- 
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