From 0b7cfdca09651f2eae5cd0e8ae4efed5033493f2 Mon Sep 17 00:00:00 2001
From: Alexander Momchilov <alexander.momchilov@shopify.com>
Date: Fri, 22 Jul 2022 16:45:03 -0400
Subject: [ruby/psych] Test that recursive refs dump as aliases

https://github.com/ruby/psych/commit/d9f7289190
---
 test/psych/test_hash.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'test/psych/test_hash.rb')

diff --git a/test/psych/test_hash.rb b/test/psych/test_hash.rb
index 5374781339..43e4b8bf14 100644
--- a/test/psych/test_hash.rb
+++ b/test/psych/test_hash.rb
@@ -112,6 +112,18 @@ eoyml
       assert_equal({"foo"=>{"hello"=>"world"}, "bar"=>{"hello"=>"world"}}, hash)
     end
 
+    def test_recursive_hash_uses_alias
+      h = { }
+      h["recursive_reference"] = h
+
+      expected = <<~eoyaml
+        --- &1
+        recursive_reference: *1
+      eoyaml
+
+      assert_equal(expected, Psych.dump(h))
+    end
+
     def test_key_deduplication
       unless String.method_defined?(:-@) && (-("a" * 20)).equal?((-("a" * 20)))
         pend "This Ruby implementation doesn't support string deduplication"
-- 
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