https://git.ruby-lang.org/ruby.git/commit/?id=cc8f55e9e3

From cc8f55e9e31e8057c6b5bfd417ca4f70d41b9a33 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 25 Apr 2020 01:43:38 +0900
Subject: [ruby/rdoc] HOME is preserved by RDoc::TestCase

https://github.com/ruby/rdoc/commit/6c4801d1f6

diff --git a/test/rdoc/test_rdoc_markdown.rb b/test/rdoc/test_rdoc_markdown.rb
index 021d942..9c7a406 100644
--- a/test/rdoc/test_rdoc_markdown.rb
+++ b/test/rdoc/test_rdoc_markdown.rb
@@ -8,6 +8,8 @@ require 'rdoc/markdown' https://github.com/ruby/ruby/blob/trunk/test/rdoc/test_rdoc_markdown.rb#L8
 class TestRDocMarkdown < RDoc::TestCase
 
   def setup
+    super
+
     @RM = RDoc::Markup
 
     @parser = RDoc::Markdown.new
diff --git a/test/rdoc/test_rdoc_ri_driver.rb b/test/rdoc/test_rdoc_ri_driver.rb
index e623233..f79d17b 100644
--- a/test/rdoc/test_rdoc_ri_driver.rb
+++ b/test/rdoc/test_rdoc_ri_driver.rb
@@ -13,7 +13,6 @@ class TestRDocRIDriver < RDoc::TestCase https://github.com/ruby/ruby/blob/trunk/test/rdoc/test_rdoc_ri_driver.rb#L13
     FileUtils.mkdir_p @home_ri
 
     @orig_ri = ENV['RI']
-    @orig_home = ENV['HOME']
     ENV['HOME'] = @tmpdir
     @rdoc_home = File.join ENV["HOME"], ".rdoc"
     FileUtils.mkdir_p @rdoc_home
@@ -33,7 +32,6 @@ class TestRDocRIDriver < RDoc::TestCase https://github.com/ruby/ruby/blob/trunk/test/rdoc/test_rdoc_ri_driver.rb#L32
   end
 
   def teardown
-    ENV['HOME'] = @orig_home
     ENV['RI'] = @orig_ri
     FileUtils.rm_rf @tmpdir
 
-- 
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