https://git.ruby-lang.org/ruby.git/commit/?id=f7f849e30c

From f7f849e30cbf462e521b0843a9bb2cbea1bd4d11 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 13 Jul 2020 19:44:52 +0900
Subject: [ruby/tmpdir] Test also TMP and TEMP environment variables

https://github.com/ruby/tmpdir/commit/414c00ebe6

diff --git a/test/test_tmpdir.rb b/test/test_tmpdir.rb
index 5cd0b5e..039b5be 100644
--- a/test/test_tmpdir.rb
+++ b/test/test_tmpdir.rb
@@ -15,21 +15,26 @@ class TestTmpdir < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/test_tmpdir.rb#L15
     skip "no meaning on this platform" if /mswin|mingw/ =~ RUBY_PLATFORM
     Dir.mktmpdir do |tmpdir|
       # ToDo: fix for parallel test
-      olddir, ENV["TMPDIR"] = ENV["TMPDIR"], tmpdir
+      envs = %w[TMPDIR TMP TEMP]
+      oldenv = envs.each_with_object({}) {|v, h| h[v] = ENV.delete(v)}
       begin
-        assert_equal(tmpdir, Dir.tmpdir)
-        File.chmod(0777, tmpdir)
-        assert_not_equal(tmpdir, Dir.tmpdir)
-        newdir = Dir.mktmpdir("d", tmpdir) do |dir|
-          assert_file.directory? dir
-          assert_equal(tmpdir, File.dirname(dir))
-          dir
+        envs.each do |e|
+          ENV[e] = tmpdir
+          assert_equal(tmpdir, Dir.tmpdir)
+          File.chmod(0777, tmpdir)
+          assert_not_equal(tmpdir, Dir.tmpdir)
+          newdir = Dir.mktmpdir("d", tmpdir) do |dir|
+            assert_file.directory? dir
+            assert_equal(tmpdir, File.dirname(dir))
+            dir
+          end
+          assert_file.not_exist?(newdir)
+          File.chmod(01777, tmpdir)
+          assert_equal(tmpdir, Dir.tmpdir)
+          ENV[e] = nil
         end
-        assert_file.not_exist?(newdir)
-        File.chmod(01777, tmpdir)
-        assert_equal(tmpdir, Dir.tmpdir)
       ensure
-        ENV["TMPDIR"] = olddir
+        ENV.update(oldenv)
       end
     end
   end
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