https://git.ruby-lang.org/ruby.git/commit/?id=e9974a466a

From e9974a466ac7edcb8035f5f7bc65c4c6731e2ee2 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 20 May 2021 20:15:43 +0900
Subject: Get rid of sporadic WSAEACCES on Windows [ruby-dev:42661]

---
 test/socket/test_addrinfo.rb | 7 ++++++-
 test/socket/test_socket.rb   | 5 ++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/test/socket/test_addrinfo.rb b/test/socket/test_addrinfo.rb
index 1421c15..e068c6c 100644
--- a/test/socket/test_addrinfo.rb
+++ b/test/socket/test_addrinfo.rb
@@ -363,7 +363,12 @@ class TestSocketAddrinfo < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/socket/test_addrinfo.rb#L363
   def random_port
     # IANA suggests dynamic port for 49152 to 65535
     # http://www.iana.org/assignments/port-numbers
-    49152 + rand(65535-49152+1)
+    case RUBY_PLATFORM
+    when /mingw|mswin/
+      rand(50000..65535)
+    else
+      rand(49152..65535)
+    end
   end
 
   def errors_addrinuse
diff --git a/test/socket/test_socket.rb b/test/socket/test_socket.rb
index 77ce093..16c359e 100644
--- a/test/socket/test_socket.rb
+++ b/test/socket/test_socket.rb
@@ -172,7 +172,10 @@ class TestSocket < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/socket/test_socket.rb#L172
   end
 
   def errors_addrinuse
-    [Errno::EADDRINUSE]
+    errs = [Errno::EADDRINUSE]
+    # MinGW fails with "Errno::EACCES: Permission denied - bind(2) for 0.0.0.0:49721"
+    errs << Errno::EACCES if /mingw/ =~ RUBY_PLATFORM
+    errs
   end
 
   def test_tcp_server_sockets
-- 
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