bpo-46685: cover TypeError of ForwardRef(1) in test_typing (GH-31223)

sobolevn · web-flow · commit d2d1d49eacca · 2022-02-09T23:23:07.000+09:00
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
@@ -2792,6 +2792,10 @@ def test_forwardref_subclass_type_error(self):
         with self.assertRaises(TypeError):
             issubclass(int, fr)
 
+    def test_forwardref_only_str_arg(self):
+        with self.assertRaises(TypeError):
+            typing.ForwardRef(1)  # only `str` type is allowed
+
     def test_forward_equality(self):
         fr = typing.ForwardRef('int')
         self.assertEqual(fr, typing.ForwardRef('int'))
