From 8797f48373dcfa3ff8e748667732dea8aea4347e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 19 Jun 2019 14:03:02 +0900
Subject: New buffer for shared string

* string.c (rb_str_init): allocate new buffer if the string is
  shared.  [Bug #15937]
---
 test/ruby/test_string.rb | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'test/ruby/test_string.rb')

diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index 1d81d24dba..afa3803023 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -79,6 +79,11 @@ class TestString < Test::Unit::TestCase
     assert_equal("mystring", str.__send__(:initialize, str, capacity: 1000))
   end
 
+  def test_initialize_shared
+    String.new(str = "mystring" * 10).__send__(:initialize, capacity: str.bytesize)
+    assert_equal("mystring", str[0, 8])
+  end
+
   def test_initialize_nonstring
     assert_raise(TypeError) {
       S(1)
-- 
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