https://git.ruby-lang.org/ruby.git/commit/?id=0cfba9cdd9

From 0cfba9cdd9c18b0245b088ed5b460f0d6f90d586 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Wed, 29 Jan 2020 00:55:11 +0900
Subject: Revert "remove debug code."

This reverts commit 65768c80beb64a14c3e918f8ed5e41e9349025d0.

diff --git a/test/ruby/test_rand.rb b/test/ruby/test_rand.rb
index 218bed7..0808c1e 100644
--- a/test/ruby/test_rand.rb
+++ b/test/ruby/test_rand.rb
@@ -2,6 +2,9 @@ https://github.com/ruby/ruby/blob/trunk/test/ruby/test_rand.rb#L2
 require 'test/unit'
 
 class TestRand < Test::Unit::TestCase
+  def teardown
+    raise if srand == 0
+  end
   def assert_random_int(ws, m, init = 0)
     # call srand in another process
     assert_separately [], %Q{
-- 
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