Update tests

Author: XuehaiPan

Lib/test/test_sys.py

@@ -723,10 +723,11 @@ def test_attributes(self):
         self.assertIsInstance(sys.float_repr_style, str)
         self.assertIn(sys.float_repr_style, ('short', 'legacy'))
         if not sys.platform.startswith('win'):
-            self.assertIsInstance(sys.abiflags, str)
-            # test hasattr(sys, 'abiflags') == (os.name != 'nt)
             self.assertEqual(os.name, 'posix')
+            self.assertIsInstance(sys.abiflags, str)
         else:
+            self.assertEqual(os.name, 'nt')
+            # TODO: sys.abiflags will be defined on Windows in Python 3.16.
             absent = object()
             with self.assertWarnsRegex(
                 DeprecationWarning,
@@ -750,9 +751,6 @@ def test_attributes(self):
                 ):
                     _ = sys.abiflags
 
-            # test hasattr(sys, 'abiflags') == (os.name != 'nt)
-            self.assertEqual(os.name, 'nt')
-
     def test_thread_info(self):
         info = sys.thread_info
         self.assertEqual(len(info), 3)