bpo-36785: PEP 574 implementation (GH-7076)

1 files changed, 5 insertions, 6 deletions

diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index be52b389e6..b3aae3a18e 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -2894,16 +2894,15 @@ class TestSignatureObject(unittest.TestCase):
     @unittest.skipIf(MISSING_C_DOCSTRINGS,
                      "Signature information for builtins requires docstrings")
     def test_signature_on_builtin_class(self):
-        self.assertEqual(str(inspect.signature(_pickle.Pickler)),
-                         '(file, protocol=None, fix_imports=True)')
+        expected = ('(file, protocol=None, fix_imports=True, '
+                    'buffer_callback=None)')
+        self.assertEqual(str(inspect.signature(_pickle.Pickler)), expected)
 
         class P(_pickle.Pickler): pass
         class EmptyTrait: pass
         class P2(EmptyTrait, P): pass
-        self.assertEqual(str(inspect.signature(P)),
-                         '(file, protocol=None, fix_imports=True)')
-        self.assertEqual(str(inspect.signature(P2)),
-                         '(file, protocol=None, fix_imports=True)')
+        self.assertEqual(str(inspect.signature(P)), expected)
+        self.assertEqual(str(inspect.signature(P2)), expected)
 
         class P3(P2):
             def __init__(self, spam):