https://git.ruby-lang.org/ruby.git/commit/?id=04de778ef1

From 04de778ef157c472dfa31239e8a6cfabceae4cb0 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 13 Jul 2020 21:26:06 +0900
Subject: [ruby/tmpdir] Test "not a directory" cases

https://github.com/ruby/tmpdir/commit/f335f2c23e

diff --git a/test/test_tmpdir.rb b/test/test_tmpdir.rb
index 039b5be..45342c4 100644
--- a/test/test_tmpdir.rb
+++ b/test/test_tmpdir.rb
@@ -19,6 +19,12 @@ class TestTmpdir < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/test_tmpdir.rb#L19
       oldenv = envs.each_with_object({}) {|v, h| h[v] = ENV.delete(v)}
       begin
         envs.each do |e|
+          tmpdirx = File.join(tmpdir, e)
+          ENV[e] = tmpdirx
+          assert_not_equal(tmpdirx, Dir.tmpdir)
+          File.write(tmpdirx, "")
+          assert_not_equal(tmpdirx, Dir.tmpdir)
+          File.unlink(tmpdirx)
           ENV[e] = tmpdir
           assert_equal(tmpdir, Dir.tmpdir)
           File.chmod(0777, tmpdir)
-- 
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