Skip more pyexpat tests based on compile-time expat version, not runtime

This is a followup for GH-144739 and GH-155485

Author: hroncok

Lib/test/test_pyexpat.py

@@ -1095,9 +1095,11 @@ def test_error_path_no_crash(self):
 
 
 class ReparseDeferralTest(unittest.TestCase):
+    deferal_supported = expat.ParserCreate().GetReparseDeferralEnabled()
+
     def test_getter_setter_round_trip(self):
         parser = expat.ParserCreate()
-        enabled = (expat.version_info >= (2, 6, 0))
+        enabled = self.deferal_supported
 
         self.assertIs(parser.GetReparseDeferralEnabled(), enabled)
         parser.SetReparseDeferralEnabled(False)
@@ -1106,8 +1108,8 @@ def test_getter_setter_round_trip(self):
         self.assertIs(parser.GetReparseDeferralEnabled(), enabled)
 
     def test_reparse_deferral_enabled(self):
-        if expat.version_info < (2, 6, 0):
-            self.skipTest(f'Expat {expat.version_info} does not '
+        if not self.deferal_supported:
+            self.skipTest(f'Expat < 2.6.0 does not '
                           'support reparse deferral')
 
         started = []
@@ -1137,7 +1139,7 @@ def start_element(name, _):
 
         parser = expat.ParserCreate()
         parser.StartElementHandler = start_element
-        if expat.version_info >= (2, 6, 0):
+        if self.deferal_supported:
             parser.SetReparseDeferralEnabled(False)
         self.assertFalse(parser.GetReparseDeferralEnabled())
 

Lib/test/test_sax.py

@@ -1216,8 +1216,8 @@ 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 '
+    @unittest.skipIf(not pyexpat.ParserCreate().GetReparseDeferralEnabled(),
+                     'Python compiled with Expat < 2.6.0 does not '
                      'support reparse deferral')
     def test_flush_reparse_deferral_enabled(self):
         result = BytesIO()

Lib/test/test_xml_etree.py

@@ -1915,8 +1915,8 @@ def test_unknown_event(self):
         with self.assertRaisesRegex(ValueError, "unknown event 'bogus'"):
             ET.XMLPullParser(events=(x.decode() for x in (b'start', b'end', b'bogus')))
 
-    @unittest.skipIf(pyexpat.version_info < (2, 6, 0),
-                     f'Expat {pyexpat.version_info} does not '
+    @unittest.skipIf(not pyexpat.ParserCreate().GetReparseDeferralEnabled(),
+                     'Python compiled with Expat < 2.6.0 does not '
                      'support reparse deferral')
     def test_flush_reparse_deferral_enabled(self):
         parser = ET.XMLPullParser(events=('start', 'end'))