Use unittest.mock instead of mock

The mock third party library was needed for mock support in py2
runtimes. Since we now only support py36 and later, we can use the
standard lib unittest.mock module instead.

Change-Id: Ib169e3deb7ddb2bc93a206ebec4043552281aa7f

4 files changed, 3 insertions, 4 deletions

diff --git a/taskflow/test.py b/taskflow/test.py
index a9cce35..a5d880a 100644
--- a/taskflow/test.py
+++ b/taskflow/test.py
@@ -16,9 +16,9 @@
 
 import collections
 import logging
+from unittest import mock
 
 import fixtures
-import mock
 from oslotest import base
 import six
 
diff --git a/taskflow/tests/unit/worker_based/test_proxy.py b/taskflow/tests/unit/worker_based/test_proxy.py
index 68688fa..c957433 100644
--- a/taskflow/tests/unit/worker_based/test_proxy.py
+++ b/taskflow/tests/unit/worker_based/test_proxy.py
@@ -15,10 +15,10 @@
 #    under the License.
 
 import socket
+from unittest import mock
 
 from taskflow.engines.worker_based import proxy
 from taskflow import test
-from taskflow.test import mock
 from taskflow.utils import threading_utils
 
 
diff --git a/test-requirements.txt b/test-requirements.txt
index def4e68..5a44051 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -26,7 +26,6 @@ psycopg2>=2.8.0 # LGPL/ZPL
 pydotplus>=2.0.2 # MIT License
 hacking<2.1,>=2.0
 oslotest>=3.2.0 # Apache-2.0
-mock>=2.0.0 # BSD
 testtools>=2.2.0 # MIT
 testscenarios>=0.4 # Apache-2.0/BSD
 stestr>=2.0.0 # Apache-2.0
diff --git a/tools/state_graph.py b/tools/state_graph.py
index 9b08638..cc70fb2 100755
--- a/tools/state_graph.py
+++ b/tools/state_graph.py
@@ -14,7 +14,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
 
 import optparse
 import os