bpo-46066: Check DeprecationWarning in test_typing (GH-31428)

Author: JelleZijlstra

Lib/test/test_typing.py

@@ -4585,8 +4585,6 @@ def test_typeddict_create_errors(self):
 
         with self.assertRaises(TypeError):
             TypedDict(_typename='Emp', name=str, id=int)
-        with self.assertRaises(TypeError):
-            TypedDict('Emp', _fields={'name': str, 'id': int})
 
     def test_typeddict_errors(self):
         Emp = TypedDict('Emp', {'name': str, 'id': int})
@@ -4598,8 +4596,11 @@ def test_typeddict_errors(self):
             isinstance(jim, Emp)
         with self.assertRaises(TypeError):
             issubclass(dict, Emp)
-        with self.assertRaises(TypeError):
-            TypedDict('Hi', x=1)
+        # We raise a DeprecationWarning for the keyword syntax
+        # before the TypeError.
+        with self.assertWarns(DeprecationWarning):
+            with self.assertRaises(TypeError):
+                TypedDict('Hi', x=1)
         with self.assertRaises(TypeError):
             TypedDict('Hi', [('x', int), ('y', 1)])
         with self.assertRaises(TypeError):