From f3192dac669ce14016efcec267ef331108d6b442 Mon Sep 17 00:00:00 2001
From: Barney Gale <barney.gale@gmail.com>
Date: Tue, 15 Apr 2025 19:16:34 +0100
Subject: GH-90812: Add test for `urlopen()` of file URI for UNC path (#132489)

---
 Lib/test/test_urllib.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
index da3db2f..90de828 100644
--- a/Lib/test/test_urllib.py
+++ b/Lib/test/test_urllib.py
@@ -181,6 +181,16 @@ class urlopen_FileTests(unittest.TestCase):
     def test_relativelocalfile(self):
         self.assertRaises(ValueError,urllib.request.urlopen,'./' + self.pathname)
 
+    def test_remote_authority(self):
+        # Test for GH-90812.
+        url = 'file://pythontest.net/foo/bar'
+        with self.assertRaises(urllib.error.URLError) as e:
+            urllib.request.urlopen(url)
+        if os.name == 'nt':
+            self.assertEqual(e.exception.filename, r'\\pythontest.net\foo\bar')
+        else:
+            self.assertEqual(e.exception.reason, 'file:// scheme is supported only on localhost')
+
 
 class ProxyTests(unittest.TestCase):
 
-- 
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