--- transaction-3.0.1/setup.py.orig	2020-12-11 12:41:44.000000000 +0100
+++ transaction-3.0.1/setup.py	2022-04-26 22:16:54.892747735 +0200
@@ -25,7 +25,7 @@ def _read_file(filename):
 
 README = _read_file('README.rst') + '\n\n' + _read_file('CHANGES.rst')
 
-tests_require = ['mock']
+tests_require = ['mock;python_version=="2.7"']
 
 setup(name='transaction',
       version=version,
--- transaction-3.1.0/src/transaction/tests/test__manager.py.orig	2023-09-25 20:29:46.755625089 +0200
+++ transaction-3.1.0/src/transaction/tests/test__manager.py	2023-09-25 20:32:52.544618584 +0200
@@ -13,7 +13,10 @@
 ##############################################################################
 import unittest
 
-import mock
+try:
+    import mock
+except ImportError:
+    from unittest import mock
 import zope.interface.verify
 
 from .. import interfaces
@@ -671,7 +674,6 @@ class TransactionManagerTests(unittest.T
         # If a datamanager registers for synchonization after a
         # transaction has started, we should call newTransaction so it
         # can do necessry setup.
-        import mock
 
         from .. import TransactionManager
         manager = TransactionManager()