Use unittest.mock instead of third party mock

Now that we no longer support py27, we can use the standard library
unittest.mock module instead of the third party mock lib.

Change-Id: I3e1e5ed4e72837d45b78e5ccb9ce8cca416e5c11
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

lower-constraints.txt

@@ -23,7 +23,6 @@ linecache2==1.0.0
 Mako==0.4.0
 MarkupSafe==1.0
 mccabe==0.2.1
-mock==2.0.0
 monotonic==0.6
 netaddr==0.7.18
 netifaces==0.10.4

oslo_db/tests/sqlalchemy/test_enginefacade.py

@@ -16,9 +16,9 @@ import copy
 import fixtures
 import pickle
 import sys
+from unittest import mock
 import warnings
 
-import mock
 from oslo_config import cfg
 from oslo_context import context as oslo_context
 from oslotest import base as oslo_test_base

oslo_db/tests/sqlalchemy/test_exc_filters.py

@@ -16,8 +16,8 @@
 
 import contextlib
 import itertools
+from unittest import mock
 
-import mock
 from oslotest import base as oslo_test_base
 import sqlalchemy as sqla
 from sqlalchemy.engine import url as sqla_url

oslo_db/tests/sqlalchemy/test_fixtures.py

@@ -10,11 +10,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
 import os
 import testresources
 import testscenarios
 import unittest
+from unittest import mock
 
 from oslo_db import exception
 from oslo_db.sqlalchemy import enginefacade

oslo_db/tests/sqlalchemy/test_migrate_cli.py

@@ -9,9 +9,9 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
+from unittest import mock
 
 import alembic
-import mock
 from oslotest import base as test_base
 import sqlalchemy
 

oslo_db/tests/sqlalchemy/test_migration_common.py

@@ -16,10 +16,10 @@
 
 import os
 import tempfile
+from unittest import mock
 
 from migrate import exceptions as migrate_exception
 from migrate.versioning import api as versioning_api
-import mock
 import sqlalchemy
 
 from oslo_db import exception as db_exception

oslo_db/tests/sqlalchemy/test_migrations.py

@@ -13,10 +13,10 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
+from unittest import mock
 
 import fixtures
 from migrate.versioning import api as versioning_api
-import mock
 from oslotest import base as test
 import sqlalchemy as sa
 import sqlalchemy.ext.declarative as sa_decl

oslo_db/tests/sqlalchemy/test_models.py

@@ -15,8 +15,8 @@
 
 from collections import abc
 import datetime
+from unittest import mock
 
-import mock
 from oslotest import base as oslo_test
 from sqlalchemy import Column
 from sqlalchemy import Integer, String

oslo_db/tests/sqlalchemy/test_ndb.py

@@ -14,8 +14,7 @@
 """Tests for MySQL Cluster (NDB) Support."""
 
 import logging
-
-import mock
+from unittest import mock
 
 from oslo_db import exception
 from oslo_db.sqlalchemy import enginefacade

oslo_db/tests/sqlalchemy/test_provision.py

@@ -10,8 +10,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
 import os
+from unittest import mock
 
 from oslotest import base as oslo_test_base
 from sqlalchemy import exc as sa_exc

oslo_db/tests/sqlalchemy/test_sqlalchemy.py

@@ -19,9 +19,9 @@
 
 import logging
 import os
+from unittest import mock
 
 import fixtures
-import mock
 from oslo_config import cfg
 from oslotest import base as oslo_test
 import sqlalchemy

oslo_db/tests/sqlalchemy/test_utils.py

@@ -13,10 +13,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from unittest import mock
 from urllib import parse
 
 import fixtures
-import mock
 from oslotest import base as test_base
 import sqlalchemy
 from sqlalchemy.dialects import mysql

oslo_db/tests/test_api.py

@@ -15,7 +15,8 @@
 
 """Unit tests for DB API."""
 
-import mock
+from unittest import mock
+
 from oslo_config import cfg
 from oslo_utils import importutils
 

oslo_db/tests/test_concurrency.py

@@ -14,8 +14,7 @@
 #    under the License.
 
 import sys
-
-import mock
+from unittest import mock
 
 from oslo_db import concurrency
 from oslo_db.tests import utils as test_utils

test-requirements.txt

@@ -5,7 +5,6 @@ hacking>=3.0,<3.1.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 eventlet!=0.18.3,!=0.20.1,>=0.18.2 # MIT
 fixtures>=3.0.0 # Apache-2.0/BSD
-mock>=2.0.0 # BSD
 python-subunit>=1.0.0 # Apache-2.0/BSD
 oslotest>=3.2.0 # Apache-2.0
 oslo.context>=2.19.2 # Apache-2.0