From 02b70256b5171d4b85ea7eeab836d3d7cfb3dbfc Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 26 Nov 2024 10:55:49 +0900
Subject: Check negative integer underflow

---
 test/ruby/test_string.rb | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index ba8d86d442..c8b9aeb597 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -164,6 +164,11 @@ CODE
     assert_raise(ArgumentError) { "foo"[] }
   end
 
+  def test_AREF_underflow
+    require "rbconfig/sizeof"
+    assert_equal(nil, S("\u{3042 3044 3046}")[RbConfig::LIMITS["LONG_MIN"], 1])
+  end
+
   def test_ASET # '[]='
     s = S("FooBar")
     s[0] = S('A')
-- 
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