[3.9] Fix tests for XMLPullParser with Expat 2.6.0 (GH-115133) (GH-115535)

Feeding the parser by too small chunks defers parsing to prevent
CVE-2023-52425. Future versions of Expat may be more reactive.
(cherry picked from commit 4a08e7b3431cd32a0daf22a33421cd3035343dc4)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Gbp-Pq: Name 0029-3.9-Fix-tests-for-XMLPullParser-with-Expat-2.6.0-GH-.patch

diff --git a/Lib/test/test_xml_etree.py b/Lib/test/test_xml_etree.py
index 2ac643f80e1b751e85ee7355ec0ccb97be599f2a..913fa5d8f2a1783dc1e016ec7d167f3f164a1826 100644 (file)
--- a/Lib/test/test_xml_etree.py
+++ b/Lib/test/test_xml_etree.py
@@ -14,6 +14,7 @@ import locale
 import operator
 import os
 import pickle
+import pyexpat
 import sys
 import textwrap
 import types
@@ -1375,28 +1376,29 @@ class XMLPullParserTest(unittest.TestCase):
         self.assertEqual([(action, elem.tag) for action, elem in events],
                          expected)
 
-    def test_simple_xml(self):
-        for chunk_size in (None, 1, 5):
-            with self.subTest(chunk_size=chunk_size):
-                parser = ET.XMLPullParser()
-                self.assert_event_tags(parser, [])
-                self._feed(parser, "<!-- comment -->\n", chunk_size)
-                self.assert_event_tags(parser, [])
-                self._feed(parser,
-                           "<root>\n  <element key='value'>text</element",
-                           chunk_size)
-                self.assert_event_tags(parser, [])
-                self._feed(parser, ">\n", chunk_size)
-                self.assert_event_tags(parser, [('end', 'element')])
-                self._feed(parser, "<element>text</element>tail\n", chunk_size)
-                self._feed(parser, "<empty-element/>\n", chunk_size)
-                self.assert_event_tags(parser, [
-                    ('end', 'element'),
-                    ('end', 'empty-element'),
-                    ])
-                self._feed(parser, "</root>\n", chunk_size)
-                self.assert_event_tags(parser, [('end', 'root')])
-                self.assertIsNone(parser.close())
+    def test_simple_xml(self, chunk_size=None):
+        parser = ET.XMLPullParser()
+        self.assert_event_tags(parser, [])
+        self._feed(parser, "<!-- comment -->\n", chunk_size)
+        self.assert_event_tags(parser, [])
+        self._feed(parser,
+                   "<root>\n  <element key='value'>text</element",
+                   chunk_size)
+        self.assert_event_tags(parser, [])
+        self._feed(parser, ">\n", chunk_size)
+        self.assert_event_tags(parser, [('end', 'element')])
+        self._feed(parser, "<element>text</element>tail\n", chunk_size)
+        self._feed(parser, "<empty-element/>\n", chunk_size)
+        self.assert_event_tags(parser, [
+            ('end', 'element'),
+            ('end', 'empty-element'),
+            ])
+        self._feed(parser, "</root>\n", chunk_size)
+        self.assert_event_tags(parser, [('end', 'root')])
+        self.assertIsNone(parser.close())
+
+    def test_simple_xml_chunk_22(self):
+        self.test_simple_xml(chunk_size=22)
 
     def test_feed_while_iterating(self):
         parser = ET.XMLPullParser()