From 937319126af801016d410226eb0cefc2c0b5ed32 Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@ruby-lang.org>
Date: Sat, 30 Nov 2024 18:34:32 +0900
Subject: merge revision(s) 02b70256b5171d4b85ea7eeab836d3d7cfb3dbfc,
 6b4f8945d600168bf530d21395da8293fbd5e8ba: [Backport #20909]

	Check negative integer underflow

	Many of Oniguruma functions need valid encoding strings
---
 test/ruby/test_string.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index 24527a527f..f4ef6ccb6b 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -162,6 +162,15 @@ 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_AREF_invalid_encoding
+    assert_equal(S("\x80"), S("A"*39+"\x80")[-1, 1])
+  end
+
   def test_ASET # '[]='
     s = S("FooBar")
     s[0] = S('A')
-- 
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