gh-117187: Fix XML tests for vanilla Expat <2.6.0 (GH-117203)

This fixes XML unittest fallout from the #115398 security fix. When configured using `--with-system-expat` on systems with older pre 2.6.0 versions of libexpat, our unittests were failing. * sax|etree: Simplify Expat version guard where simplifiable Idea by Matěj Cepl * sax|etree: Fix reparse deferral tests for vanilla Expat <2.6.0 This *does not fix* the case of distros with an older version of libexpat with the 2.6.0 feature backported as a security fix. (Ubuntu is a known example of this with its libexpat1 2.5.0-2ubunutu0.1 package) (cherry picked from commit 9f74e86) Co-authored-by: Sebastian Pipping <[email protected]>
python · ambv · Mar 27, 2024 · Mar 26, 2024 · Mar 26, 2024 · 8f2350c2d515c013c64298a9aee4a71cbd34dd3a
commit 8f2350c2d515c013c64298a9aee4a71cbd34dd3a
diff --git a/Lib/test/test_sax.py b/Lib/test/test_sax.py
@@ -1215,10 +1215,10 @@ def test_expat_incremental_reset(self):
 
         self.assertEqual(result.getvalue(), start + b"<doc>text</doc>")
 
+    @unittest.skipIf(pyexpat.version_info < (2, 6, 0),
+                     f'Expat {pyexpat.version_info} does not '
+                     'support reparse deferral')
     def test_flush_reparse_deferral_enabled(self):
-        if pyexpat.version_info < (2, 6, 0):
-            self.skipTest(f'Expat {pyexpat.version_info} does not support reparse deferral')
-
         result = BytesIO()
         xmlgen = XMLGenerator(result)
         parser = create_parser()
@@ -1251,8 +1251,8 @@ def test_flush_reparse_deferral_disabled(self):
 
         if pyexpat.version_info >= (2, 6, 0):
             parser._parser.SetReparseDeferralEnabled(False)
+            self.assertEqual(result.getvalue(), start)  # i.e. no elements started
 
-        self.assertEqual(result.getvalue(), start)  # i.e. no elements started
         self.assertFalse(parser._parser.GetReparseDeferralEnabled())
 
         parser.flush()

diff --git a/Lib/test/test_xml_etree.py b/Lib/test/test_xml_etree.py
@@ -1623,11 +1623,10 @@ def test_unknown_event(self):
         with self.assertRaises(ValueError):
             ET.XMLPullParser(events=('start', 'end', 'bogus'))
 
+    @unittest.skipIf(pyexpat.version_info < (2, 6, 0),
+                     f'Expat {pyexpat.version_info} does not '
+                     'support reparse deferral')
     def test_flush_reparse_deferral_enabled(self):
-        if pyexpat.version_info < (2, 6, 0):
-            self.skipTest(f'Expat {pyexpat.version_info} does not '
-                          'support reparse deferral')
-
         parser = ET.XMLPullParser(events=('start', 'end'))
 
         for chunk in ("<doc", ">"):
@@ -1659,8 +1658,8 @@ def test_flush_reparse_deferral_disabled(self):
                 self.skipTest(f'XMLParser.(Get|Set)ReparseDeferralEnabled '
                               'methods not available in C')
             parser._parser._parser.SetReparseDeferralEnabled(False)
+            self.assert_event_tags(parser, [])  # i.e. no elements started
 
-        self.assert_event_tags(parser, [])  # i.e. no elements started
         if ET is pyET:
             self.assertFalse(parser._parser._parser.GetReparseDeferralEnabled())
 

diff --git a/Misc/NEWS.d/next/Tests/2024-03-24-23-49-25.gh-issue-117187.eMLT5n.rst b/Misc/NEWS.d/next/Tests/2024-03-24-23-49-25.gh-issue-117187.eMLT5n.rst
@@ -0,0 +1 @@
+Fix XML tests for vanilla Expat <2.6.0.