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

(cherry picked from commit d2d1d49)

Co-authored-by: Nikita Sobolev <[email protected]>

Author: miss-islington

Lib/test/test_typing.py

@@ -2455,6 +2455,10 @@ 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'))