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   |   16 ++++++++++++----
 Lib/test/test_xml_etree.py |    6 ------
 2 files changed, 12 insertions(+), 10 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
@@ -9,6 +9,7 @@ import xml.dom.minidom
 
 from xml.dom.minidom import parse, Node, Document, parseString
 from xml.dom.minidom import getDOMImplementation
+from xml.parsers.expat import ExpatError
 
 
 tstfile = support.findfile("test.xml", subdir="xmltestdata")
@@ -1156,8 +1157,12 @@ class MinidomTest(unittest.TestCase):
 
         # Verify that character decoding errors raise exceptions instead
         # of crashing
-        self.assertRaises(UnicodeDecodeError, parseString,
-                b'<fran\xe7ais>Comment \xe7a va ? Tr\xe8s bien ?</fran\xe7ais>')
+        # 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()
 
@@ -1602,8 +1607,11 @@ class MinidomTest(unittest.TestCase):
         self.confirm(doc2.namespaceURI == xml.dom.EMPTY_NAMESPACE)
 
     def testExceptionOnSpacesInXMLNSValue(self):
-        with self.assertRaisesRegex(ValueError, 'Unsupported syntax'):
-            parseString('<element xmlns:abc="http:abc.com/de f g/hi/j k"><abc:foo /></element>')
+        # 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):
         doc = parse(tstfile)
--- a/Lib/test/test_xml_etree.py
+++ b/Lib/test/test_xml_etree.py
@@ -1668,12 +1668,6 @@ class BugsTest(unittest.TestCase):
                 b"<?xml version='1.0' encoding='ascii'?>\n"
                 b'<body>t&#227;g</body>')
 
-    def test_issue3151(self):
-        e = ET.XML('<prefix:localname xmlns:prefix="${stuff}"/>')
-        self.assertEqual(e.tag, '{${stuff}}localname')
-        t = ET.ElementTree(e)
-        self.assertEqual(ET.tostring(e), b'<ns0:localname xmlns:ns0="${stuff}" />')
-
     def test_issue6565(self):
         elem = ET.XML("<body><tag/></body>")
         self.assertEqual(summarize_list(elem), ['tag'])
