https://git.ruby-lang.org/ruby.git/commit/?id=e1c3cb9357

From e1c3cb9357aa952633757556fccb4e7e14dfa091 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 24 Jun 2021 18:49:49 +0900
Subject: test: imply random test order by --seed option

---
 tool/lib/test/unit.rb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tool/lib/test/unit.rb b/tool/lib/test/unit.rb
index 7862f09..391c065 100644
--- a/tool/lib/test/unit.rb
+++ b/tool/lib/test/unit.rb
@@ -62,13 +62,16 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L62
         non_options(args, options)
         @run_options = orig_args
 
+        order = options[:test_order]
         if seed = options[:seed]
+          order ||= :random
           srand(seed)
         else
           seed = options[:seed] = srand % 100_000
           srand(seed)
           orig_args.unshift "--seed=#{seed}"
         end
+        MiniTest::Unit::TestCase.test_order = order if order
 
         @help = "\n" + orig_args.map { |s|
           "  " + (s =~ /[\s|&<>$()]/ ? s.inspect : s)
@@ -100,7 +103,7 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit.rb#L103
         end
 
         opts.on '--test-order=random|alpha|sorted|nosort', [:random, :alpha, :sorted, :nosort] do |a|
-          MiniTest::Unit::TestCase.test_order = a
+          options[:test_order] = a
         end
       end
 
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