Add test

Author: Viicos

Lib/test/test_typing.py

@@ -7158,6 +7158,8 @@ class C:
 
         self.assertEqual(get_type_hints(C, format=annotationlib.Format.STRING),
                          {'x': 'undefined'})
+        # Make sure using an int as format also works:
+        self.assertEqual(get_type_hints(C, format=3), {'x': 'undefined'})
 
     def test_get_type_hints_format_function(self):
         def func(x: undefined) -> undefined: ...