9 files changed, 9 insertions, 8 deletions
diff --git a/src/mailman/bin/tests/test_mailman.py b/src/mailman/bin/tests/test_mailman.py
index 8c5a3396b..38c684425 100644
--- a/src/mailman/bin/tests/test_mailman.py
+++ b/src/mailman/bin/tests/test_mailman.py
@@ -25,8 +25,8 @@ __all__ = [
 import unittest
 
 from io import StringIO
-from mock import patch
 from mailman.bin.mailman import main
+from unittest.mock import patch
 
 
 
diff --git a/src/mailman/commands/tests/test_conf.py b/src/mailman/commands/tests/test_conf.py
index 5ff93895d..7412b5dec 100644
--- a/src/mailman/commands/tests/test_conf.py
+++ b/src/mailman/commands/tests/test_conf.py
@@ -24,13 +24,13 @@ __all__ = [
 
 import os
 import sys
-import mock
 import tempfile
 import unittest
 
 from io import StringIO
 from mailman.commands.cli_conf import Conf
 from mailman.testing.layers import ConfigLayer
+from unittest import mock
 
 
 
diff --git a/src/mailman/commands/tests/test_import.py b/src/mailman/commands/tests/test_import.py
index 96f955e52..9da0dac5b 100644
--- a/src/mailman/commands/tests/test_import.py
+++ b/src/mailman/commands/tests/test_import.py
@@ -27,8 +27,8 @@ import unittest
 from mailman.app.lifecycle import create_list
 from mailman.commands.cli_import import Import21
 from mailman.testing.layers import ConfigLayer
-from mock import patch
 from pkg_resources import resource_filename
+from unittest.mock import patch
 
 
 
diff --git a/src/mailman/config/tests/test_configuration.py b/src/mailman/config/tests/test_configuration.py
index 5a245c8b7..b45767cb7 100644
--- a/src/mailman/config/tests/test_configuration.py
+++ b/src/mailman/config/tests/test_configuration.py
@@ -25,7 +25,6 @@ __all__ = [
 
 
 import os
-import mock
 import tempfile
 import unittest
 
@@ -37,6 +36,7 @@ from mailman.interfaces.configuration import (
 from mailman.testing.helpers import configuration, event_subscribers
 from mailman.testing.layers import ConfigLayer
 from pkg_resources import resource_filename
+from unittest import mock
 
 
 
diff --git a/src/mailman/database/tests/test_factory.py b/src/mailman/database/tests/test_factory.py
index acb7c32a4..b0133c5ef 100644
--- a/src/mailman/database/tests/test_factory.py
+++ b/src/mailman/database/tests/test_factory.py
@@ -31,10 +31,10 @@ from mailman.database.factory import LAST_STORM_SCHEMA_VERSION, SchemaManager
 from mailman.database.model import Model
 from mailman.interfaces.database import DatabaseError
 from mailman.testing.layers import ConfigLayer
-from mock import patch
 from sqlalchemy import MetaData, Table, Column, Integer, Unicode
 from sqlalchemy.exc import ProgrammingError, OperationalError
 from sqlalchemy.schema import Index
+from unittest.mock import patch
 
 
 
diff --git a/src/mailman/docs/NEWS.rst b/src/mailman/docs/NEWS.rst
index f6d381a7d..db86363e4 100644
--- a/src/mailman/docs/NEWS.rst
+++ b/src/mailman/docs/NEWS.rst
@@ -37,6 +37,7 @@ Bugs
    backported smtpd module which can accept non-UTF-8 data.  (Closes #140)
  * Bulk emails are now decorated with headers and footers.  Given by Aurélien
    Bompard.  (Closes #145)
+ * Core no longer depends on the standalone `mock` module.  (Closes: #146)
 
 Configuration
 -------------
diff --git a/src/mailman/runners/tests/test_nntp.py b/src/mailman/runners/tests/test_nntp.py
index 6f3994c75..bfa87e942 100644
--- a/src/mailman/runners/tests/test_nntp.py
+++ b/src/mailman/runners/tests/test_nntp.py
@@ -23,7 +23,6 @@ __all__ = [
     ]
 
 
-import mock
 import socket
 import nntplib
 import unittest
@@ -36,6 +35,7 @@ from mailman.testing.helpers import (
     LogFileMark, configuration, get_queue_messages, make_testable_runner,
     specialized_message_from_string as mfs)
 from mailman.testing.layers import ConfigLayer
+from unittest import mock
 
 
 
diff --git a/src/mailman/testing/helpers.py b/src/mailman/testing/helpers.py
index 8fa4fbd2f..b05847b42 100644
--- a/src/mailman/testing/helpers.py
+++ b/src/mailman/testing/helpers.py
@@ -40,7 +40,6 @@ __all__ = [
 
 import os
 import json
-import mock
 import time
 import uuid
 import errno
@@ -67,6 +66,7 @@ from mailman.interfaces.styles import IStyleManager
 from mailman.interfaces.usermanager import IUserManager
 from mailman.runners.digest import DigestRunner
 from mailman.utilities.mailbox import Mailbox
+from unittest import mock
 from urllib.error import HTTPError
 from urllib.parse import urlencode
 from zope import event
diff --git a/src/mailman/utilities/tests/test_import.py b/src/mailman/utilities/tests/test_import.py
index a0b1767c1..dd3940cdd 100644
--- a/src/mailman/utilities/tests/test_import.py
+++ b/src/mailman/utilities/tests/test_import.py
@@ -29,7 +29,6 @@ __all__ = [
 
 
 import os
-import mock
 import unittest
 
 from datetime import timedelta, datetime
@@ -56,6 +55,7 @@ from mailman.utilities.importer import import_config_pck, Import21Error
 from mailman.utilities.string import expand
 from pickle import load
 from pkg_resources import resource_filename
+from unittest import mock
 from zope.component import getUtility