From 9eac9d71786a8dbec520d0541a91149f01adf8ea Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 24 Oct 2023 18:33:14 +0900
Subject: [Bug #19969] Compact st_table after deleted if possible

---
 test/ruby/test_hash.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index f95876d855..35d30095c2 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -1792,6 +1792,15 @@ class TestHash < Test::Unit::TestCase
     assert_no_memory_leak([], prepare, code, bug9187)
   end
 
+  def test_memory_size_after_delete
+    require 'objspace'
+    h = {}
+    1000.times {|i| h[i] = true}
+    big = ObjectSpace.memsize_of(h)
+    1000.times {|i| h.delete(i)}
+    assert_operator ObjectSpace.memsize_of(h), :<, big/10
+  end
+
   def test_wrapper
     bug9381 = '[ruby-core:59638] [Bug #9381]'
 
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