From 84837e6d16cb0e588b1acc2691cb1048b9a89989 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sun, 30 Jun 2019 09:33:24 +0900
Subject: [PATCH] Wait for the helper thread to terminate

---
 test/ruby/test_signal.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/ruby/test_signal.rb b/test/ruby/test_signal.rb
index 1929805858..48cb60cb77 100644
--- a/test/ruby/test_signal.rb
+++ b/test/ruby/test_signal.rb
@@ -340,6 +340,7 @@ class TestSignal < Test::Unit::TestCase
         w.close
       end
       assert_raise(Errno::ECHILD) { Process.wait(pid) }
+      th.join
       assert_nil nb
     end