https://git.ruby-lang.org/ruby.git/commit/?id=080169147e

From 080169147e0607ea5a19ca9291e6642fe87c5321 Mon Sep 17 00:00:00 2001
From: Charles Oliver Nutter <headius@h...>
Date: Thu, 30 Sep 2021 10:42:01 -0500
Subject: [ruby/open3] Use RbConfig's 'host_os'

RUBY_PLATFORM on JRuby is always 'java' so it does not indicate
the host OS.

https://github.com/ruby/open3/commit/d2308040e6
---
 test/test_open3.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/test_open3.rb b/test/test_open3.rb
index 699b05a90c2..36ccd4c9e26 100644
--- a/test/test_open3.rb
+++ b/test/test_open3.rb
@@ -95,7 +95,7 @@ class TestOpen3 < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/test_open3.rb#L95
   end
 
   def test_numeric_file_descriptor3
-    skip "passing FDs bigger than 2 is not supported on Windows" if /mswin|mingw/ =~ RUBY_PLATFORM
+    skip "passing FDs bigger than 2 is not supported on Windows" if /mswin|mingw/ =~ RbConfig::CONFIG['host_os']
     with_pipe {|r, w|
       Open3.popen3(RUBY, '-e', 'IO.open(3).puts "foo"', 3 => w) {|i,o,e,t|
         assert_equal("foo\n", r.gets, "[GH-808] [ruby-core:67347] [Bug #10699]")
-- 
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