Issue #22995: Default implementation of __reduce__ and __reduce_ex__ now

rejects builtin types with not defined __new__.
Added tests for non-pickleable types.

1 files changed, 11 insertions, 0 deletions

diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
index 7cd1d7c992..7154e139bc 100644
--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
@@ -1,6 +1,7 @@
 import unittest
 from test import support
 import binascii
+import pickle
 import random
 import sys
 from test.support import bigmemtest, _1G, _4G
@@ -600,6 +601,16 @@ class CompressObjectTestCase(BaseCompressTestCase, unittest.TestCase):
         d.flush()
         self.assertRaises(ValueError, d.copy)
 
+    def test_compresspickle(self):
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            with self.assertRaises((TypeError, pickle.PicklingError)):
+                pickle.dumps(zlib.compressobj(zlib.Z_BEST_COMPRESSION), proto)
+
+    def test_decompresspickle(self):
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            with self.assertRaises((TypeError, pickle.PicklingError)):
+                pickle.dumps(zlib.decompressobj(), proto)
+
     # Memory use of the following functions takes into account overallocation
 
     @bigmemtest(size=_1G + 1024 * 1024, memuse=3)