Test that free-threaded builds don't have .abi3.so in suffixes

Author: encukou

Lib/test/test_importlib/extension/test_finder.py

@@ -66,7 +66,9 @@ def test_abi3_extension_suffixes(self):
         elif 'cygwin' in sys.platform:
             pass
         else:
-            if not Py_GIL_DISABLED:
+            if Py_GIL_DISABLED:
+                self.assertNotIn(".abi3.so", suffixes)
+            else:
                 self.assertIn(".abi3.so", suffixes)
             self.assertIn(".abi3t.so", suffixes)