https://git.ruby-lang.org/ruby.git/commit/?id=5921bfc7ce

From 5921bfc7ce91aa8079dd8ac4faf873ec911ce320 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 5 Jul 2022 09:37:17 +0900
Subject: Add `--stdout-on-failure`, the reverse of `--stderr-on-failure`

---
 tool/lib/test/unit.rb | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/tool/lib/test/unit.rb b/tool/lib/test/unit.rb
index ade0e62f6f..8cb6d8f651 100644
--- a/tool/lib/test/unit.rb
+++ b/tool/lib/test/unit.rb
@@ -1182,15 +1182,20 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L1182
       def setup_options(parser, options)
         super
         parser.separator "output options:"
+
+        options[:failed_output] = $stdout
         parser.on '--stderr-on-failure', 'Use stderr to print failure messages' do
-          options[:stderr_on_failure] = true
+          options[:failed_output] = $stderr
+        end
+        parser.on '--stdout-on-failure', 'Use stdout to print failure messages', '(default)' do
+          options[:failed_output] = $stdout
         end
       end
 
       def process_args(args = [])
         return @options if @options
         options = super
-        @failed_output = options[:stderr_on_failure] ? $stderr : $stdout
+        @failed_output = options[:failed_output]
         options
       end
     end
-- 
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