https://git.ruby-lang.org/ruby.git/commit/?id=cac6fe9023

From cac6fe90236c8541059edc74080d50c49be7ea87 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Wed, 26 Jan 2022 01:34:57 +0900
Subject: add `--stderr-on-failure` option to test-all

Now all failure messages are printed to stdout. This option
makes all failure messages printed into stderr.
---
 tool/lib/test/unit.rb | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tool/lib/test/unit.rb b/tool/lib/test/unit.rb
index 3bb2692b43c..f4f44f80104 100644
--- a/tool/lib/test/unit.rb
+++ b/tool/lib/test/unit.rb
@@ -199,6 +199,9 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L199
         @help = "\n" + orig_args.map { |s|
           "  " + (s =~ /[\s|&<>$()]/ ? s.inspect : s)
         }.join("\n")
+
+        @failed_output = options[:stderr_on_failure] ? $stderr : $stdout
+
         @options = options
       end
 
@@ -1004,7 +1007,7 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L1007
           end
           first, msg = msg.split(/$/, 2)
           first = sprintf("%3d) %s", @report_count += 1, first)
-          $stdout.print(sep, @colorize.decorate(first, color), msg, "\n")
+          @failed_output.print(sep, @colorize.decorate(first, color), msg, "\n")
           sep = nil
         end
         report.clear
@@ -1106,6 +1109,9 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L1109
         parser.on '-x', '--exclude REGEXP', 'Exclude test files on pattern.' do |pattern|
           (options[:reject] ||= []) << pattern
         end
+        parser.on '--stderr-on-failure', 'Use stderr to print failure messages' do
+          options[:stderr_on_failure] = true
+        end
       end
 
       def complement_test_name f, orig_f
-- 
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