https://git.ruby-lang.org/ruby.git/commit/?id=9f60ceec54

From 9f60ceec54a8c05d198d1722c65c8a29e4c71e35 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 15 Jul 2020 23:41:37 +0900
Subject: Suppress bell during the test


diff --git a/test/readline/test_readline.rb b/test/readline/test_readline.rb
index db67986..12cac20 100644
--- a/test/readline/test_readline.rb
+++ b/test/readline/test_readline.rb
@@ -596,7 +596,14 @@ module BasetestReadline https://github.com/ruby/ruby/blob/trunk/test/readline/test_readline.rb#L596
         end
         w.write("a\t\n")
         w.flush
-        line = Readline.readline('> ', false)
+        begin
+          stderr = $stderr.dup
+          $stderr.reopen(null)
+          line = Readline.readline('> ', false)
+        ensure
+          $stderr.reopen(stderr)
+          stderr.close
+        end
       end
     end
 
-- 
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