https://git.ruby-lang.org/ruby.git/commit/?id=d5237c5d10

From d5237c5d10013e81baab5a78ab74c5b0f2c05825 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Tue, 11 May 2021 13:04:32 +0900
Subject: [rubygems/rubygems] Import capture_subprocess_io from minitest

https://github.com/rubygems/rubygems/commit/8b2ca6df3a
---
 lib/rubygems/test_case.rb | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/lib/rubygems/test_case.rb b/lib/rubygems/test_case.rb
index 7075347..3d8e6f4 100644
--- a/lib/rubygems/test_case.rb
+++ b/lib/rubygems/test_case.rb
@@ -145,6 +145,43 @@ class Gem::TestCase < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/lib/rubygems/test_case.rb#L145
     assert File.directory?(path), msg
   end
 
+  # https://github.com/seattlerb/minitest/blob/master/lib/minitest/assertions.rb#L188
+  def _synchronize
+    yield
+  end
+
+  # https://github.com/seattlerb/minitest/blob/master/lib/minitest/assertions.rb#L546
+  def capture_subprocess_io
+    _synchronize do
+      begin
+        require "tempfile"
+
+        captured_stdout, captured_stderr = Tempfile.new("out"), Tempfile.new("err")
+
+        orig_stdout, orig_stderr = $stdout.dup, $stderr.dup
+        $stdout.reopen captured_stdout
+        $stderr.reopen captured_stderr
+
+        yield
+
+        $stdout.rewind
+        $stderr.rewind
+
+        return captured_stdout.read, captured_stderr.read
+      ensure
+        captured_stdout.unlink
+        captured_stderr.unlink
+        $stdout.reopen orig_stdout
+        $stderr.reopen orig_stderr
+
+        orig_stdout.close
+        orig_stderr.close
+        captured_stdout.close
+        captured_stderr.close
+      end
+    end
+  end
+
   ##
   # Sets the ENABLE_SHARED entry in RbConfig::CONFIG to +value+ and restores
   # the original value when the block ends
-- 
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