https://git.ruby-lang.org/ruby.git/commit/?id=9a3333986f

From 9a3333986f76522fd6e0b9ca92045895a1aa45e0 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 11 Oct 2021 23:17:05 +0900
Subject: Add more `grpowned?` tests

---
 test/ruby/test_file_exhaustive.rb | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/test/ruby/test_file_exhaustive.rb b/test/ruby/test_file_exhaustive.rb
index 70966d83a4..9dd05f6c93 100644
--- a/test/ruby/test_file_exhaustive.rb
+++ b/test/ruby/test_file_exhaustive.rb
@@ -78,6 +78,19 @@ class TestFileExhaustive < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_file_exhaustive.rb#L78
     @notownedfile
   end
 
+  def grpownedfile
+    return nil unless POSIX
+    return @grpownedfile if defined? @grpownedfile
+    if group = (Process.groups - [Process.egid]).last
+      grpownedfile = make_tmp_filename("grpownedfile")
+      make_file("grpowned", grpownedfile)
+      File.chown(nil, group, grpownedfile)
+      return @grpownedfile = grpownedfile
+    end
+  rescue
+    @grpownedfile = nil
+  end
+
   def suidfile
     return @suidfile if defined? @suidfile
     if POSIX
@@ -493,6 +506,9 @@ class TestFileExhaustive < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_file_exhaustive.rb#L506
   def test_grpowned_p ## xxx
     assert_file.grpowned?(regular_file)
     assert_file.grpowned?(utf8_file)
+    if file = grpownedfile
+      assert_file.grpowned?(file)
+    end
   end if POSIX
 
   def io_open(file_name)
@@ -1454,6 +1470,7 @@ class TestFileExhaustive < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_file_exhaustive.rb#L1470
       fn1,
       zerofile,
       notownedfile,
+      grpownedfile,
       suidfile,
       sgidfile,
       stickyfile,
@@ -1689,6 +1706,9 @@ class TestFileExhaustive < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_file_exhaustive.rb#L1706
 
   def test_stat_grpowned_p ## xxx
     assert_predicate(File::Stat.new(regular_file), :grpowned?)
+    if file = grpownedfile
+      assert_predicate(File::Stat.new(file), :grpowned?)
+    end
   end if POSIX
 
   def test_stat_suid
-- 
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