From 7da97f61816f3cadaa6788804b22a2434b40e8c5 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Mon, 21 Feb 2022 08:16:09 -0800
Subject: [PATCH] bpo-46811: Make test suite support Expat >=2.4.5 (GH-31453)
 (GH-31472)

Curly brackets were never allowed in namespace URIs
according to RFC 3986, and so-called namespace-validating
XML parsers have the right to reject them a invalid URIs.

libexpat >=2.4.5 has become strcter in that regard due to
related security issues; with ET.XML instantiating a
namespace-aware parser under the hood, this test has no
future in CPython.

References:
- https://datatracker.ietf.org/doc/html/rfc3968
- https://www.w3.org/TR/xml-names/

Also, test_minidom.py: Support Expat >=2.4.5
(cherry picked from commit 2cae93832f46b245847bdc252456ddf7742ef45e)

Co-authored-by: Sebastian Pipping <sebastian@pipping.org>
---
 Lib/test/test_minidom.py |   23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2022-02-20-21-03-31.bpo-46811.8BxgdQ.rst

--- a/Lib/test/test_minidom.py
+++ b/Lib/test/test_minidom.py
@@ -6,7 +6,6 @@ import io
 from test import support
 import unittest
 
-import pyexpat
 import xml.dom.minidom
 
 from xml.dom.minidom import parse, Node, Document, parseString
@@ -1149,13 +1148,11 @@ class MinidomTest(unittest.TestCase):
 
         # Verify that character decoding errors raise exceptions instead
         # of crashing
-        if pyexpat.version_info >= (2, 4, 5):
-            self.assertRaises(ExpatError, parseString,
-                    b'<fran\xe7ais></fran\xe7ais>')
-            self.assertRaises(ExpatError, parseString,
-                    b'<franais>Comment \xe7a va ? Tr\xe8s bien ?</franais>')
-        else:
-            self.assertRaises(UnicodeDecodeError, parseString,
+        # It doesn’t make any sense to insist on the exact text of the
+        # error message, or even the exact Exception … it is enough that
+        # the error has been discovered.
+        with self.assertRaises((UnicodeDecodeError, ExpatError)):
+            parseString(
                 b'<fran\xe7ais>Comment \xe7a va ? Tr\xe8s bien ?</fran\xe7ais>')
 
         doc.unlink()
@@ -1617,12 +1614,10 @@ class MinidomTest(unittest.TestCase):
         self.confirm(doc2.namespaceURI == xml.dom.EMPTY_NAMESPACE)
 
     def testExceptionOnSpacesInXMLNSValue(self):
-        if pyexpat.version_info >= (2, 4, 5):
-            context = self.assertRaisesRegex(ExpatError, 'syntax error')
-        else:
-            context = self.assertRaisesRegex(ValueError, 'Unsupported syntax')
-
-        with context:
+        # It doesn’t make any sense to insist on the exact text of the
+        # error message, or even the exact Exception … it is enough that
+        # the error has been discovered.
+        with self.assertRaises((ExpatError, ValueError)):
             parseString('<element xmlns:abc="http:abc.com/de f g/hi/j k"><abc:foo /></element>')
 
     def testDocRemoveChild(self):