https://git.ruby-lang.org/ruby.git/commit/?id=0d29c3179c

From 0d29c3179c86a73206939ba637e4fdf2dd6eff9a Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 7 Mar 2021 20:05:21 +0900
Subject: [ruby/stringio] Include all modules included into
 Test::Unit::TestCase

Some methods are separated into modules in test-unit now.

https://github.com/ruby/stringio/commit/d289848994
---
 tool/lib/test/unit/core_assertions.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tool/lib/test/unit/core_assertions.rb b/tool/lib/test/unit/core_assertions.rb
index c7762f0..ff78c2b 100644
--- a/tool/lib/test/unit/core_assertions.rb
+++ b/tool/lib/test/unit/core_assertions.rb
@@ -260,6 +260,7 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit/core_assertions.rb#L260
       ABORT_SIGNALS = Signal.list.values_at(*%w"ILL ABRT BUS SEGV TERM")
 
       def separated_runner(out = nil)
+        include(*Test::Unit::TestCase.ancestors.select {|c| !c.is_a?(Class) })
         out = out ? IO.new(out, 'w') : STDOUT
         at_exit {
           out.puts [Marshal.dump($!)].pack('m'), "assertions=\#{self._assertions}"
-- 
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