refactor: switch from mock to unittest.mock (openedx#34844)

As of Python 3.3, the 3rd-party `mock` package has been subsumed into the
standard `unittest.mock` package. Refactoring tests to use the latter will
allow us to drop `mock` as a dependency, which is currently coming in
transitively through requirements/edx/paver.in.

We don't actually drop the `mock` dependency in this PR. That will happen
naturally in:

* openedx#34830

cms/djangoapps/contentstore/rest_api/v0/tests/test_assets.py

@@ -5,12 +5,11 @@
 not the underlying Xblock service.
 It checks that the assets_handler method of the Xblock service is called with the expected parameters.
 """
-from unittest.mock import patch
+from unittest.mock import patch, MagicMock
+
 from django.core.files import File
 from django.http import JsonResponse
-
 from django.urls import reverse
-from mock import MagicMock
 from rest_framework import status
 from rest_framework.test import APITestCase
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase

cms/djangoapps/contentstore/rest_api/v1/views/tests/test_proctoring.py

@@ -1,8 +1,9 @@
 """
 Unit tests for Contentstore Proctored Exam Settings.
 """
+from unittest.mock import patch
+
 import ddt
-from mock import patch
 from django.conf import settings
 from django.test.utils import override_settings
 from django.urls import reverse

cms/djangoapps/contentstore/rest_api/v1/views/tests/test_settings.py

@@ -1,10 +1,11 @@
 """
 Unit tests for course settings views.
 """
+from unittest.mock import patch
+
 import ddt
 from django.conf import settings
 from django.urls import reverse
-from mock import patch
 from rest_framework import status
 
 from cms.djangoapps.contentstore.tests.utils import CourseTestCase

cms/djangoapps/contentstore/rest_api/v1/views/tests/test_videos.py

@@ -1,6 +1,8 @@
 """
 Unit tests for course settings views.
 """
+from unittest.mock import patch
+
 import ddt
 from django.conf import settings
 from django.contrib.staticfiles.storage import staticfiles_storage
@@ -12,7 +14,6 @@
     get_transcript_credentials_state_for_org,
     get_transcript_preferences,
 )
-from mock import patch
 from rest_framework import status
 
 from cms.djangoapps.contentstore.video_storage_handlers import get_all_transcript_languages

common/test/utils.py

@@ -1,6 +1,7 @@
 """
 General testing utilities.
 """
+from unittest.mock import Mock, patch
 
 
 import functools
@@ -9,7 +10,6 @@
 
 from django.dispatch import Signal
 from markupsafe import escape
-from mock import Mock, patch
 
 
 @contextmanager

lms/djangoapps/course_goals/tests/test_user_activity.py

@@ -3,7 +3,7 @@
 """
 
 from datetime import datetime, timedelta
-from unittest.mock import Mock
+from unittest.mock import Mock, patch
 
 import ddt
 from django.contrib.auth import get_user_model
@@ -12,7 +12,6 @@
 from edx_django_utils.cache import TieredCache
 from edx_toggles.toggles.testutils import override_waffle_flag
 from freezegun import freeze_time
-from mock import patch
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory, BlockFactory
 

lms/djangoapps/course_home_api/course_metadata/tests/test_views.py

@@ -1,14 +1,13 @@
 """
 Tests for the Course Home Course Metadata API in the Course Home API
 """
+import json
+from unittest.mock import patch
 
 import ddt
-import json
-import mock
 from django.db import transaction
 from django.urls import reverse
 from edx_toggles.toggles.testutils import override_waffle_flag
-from unittest.mock import patch
 
 from common.djangoapps.course_modes.models import CourseMode
 from common.djangoapps.student.models import CourseEnrollment
@@ -108,7 +107,7 @@ def test_streak_data_in_response(self):
         CourseEnrollment.enroll(self.user, self.course.id, 'audit')
         with override_waffle_flag(COURSEWARE_MFE_MILESTONES_STREAK_DISCOUNT, active=True):
             UPDATES_METHOD_NAME = 'common.djangoapps.student.models.user.UserCelebration.perform_streak_updates'
-            with mock.patch(UPDATES_METHOD_NAME, return_value=3):
+            with patch(UPDATES_METHOD_NAME, return_value=3):
                 response = self.client.get(self.url, content_type='application/json')
                 celebrations = response.json()['celebrations']
                 assert celebrations['streak_length_to_celebrate'] == 3
@@ -187,7 +186,7 @@ def test_course_access(
             self.update_masquerade(role=masquerade_role)
 
         consent_url = 'dump/consent/url' if dsc_required else None
-        with mock.patch('openedx.features.enterprise_support.api.get_enterprise_consent_url', return_value=consent_url):
+        with patch('openedx.features.enterprise_support.api.get_enterprise_consent_url', return_value=consent_url):
             response = self.client.get(self.url)
 
         self._assert_course_access_response(response, expect_course_access, error_code)

lms/djangoapps/discussion/django_comment_client/base/tests.py

@@ -6,15 +6,15 @@
 import json
 import logging
 from contextlib import contextmanager
+from unittest import mock
+from unittest.mock import ANY, Mock, patch
 
 import ddt
-import mock
 from django.contrib.auth.models import User
 from django.core.management import call_command
 from django.test.client import RequestFactory
 from django.urls import reverse
 from eventtracking.processors.exceptions import EventEmissionExit
-from mock import ANY, Mock, patch
 from opaque_keys.edx.keys import CourseKey
 from openedx_events.learning.signals import FORUM_THREAD_CREATED, FORUM_THREAD_RESPONSE_CREATED, FORUM_RESPONSE_COMMENT_CREATED
 

lms/djangoapps/instructor/tests/test_tools.py

@@ -7,14 +7,14 @@
 import json
 import unittest
 from unittest import mock
+from unittest.mock import MagicMock, patch
 
 import pytest
 from django.contrib.auth.models import User  # lint-amnesty, pylint: disable=imported-auth-user
 from django.core.exceptions import MultipleObjectsReturned
 from django.test import TestCase
 from edx_when.api import get_dates_for_course, set_dates_for_course
 from edx_when.field_data import DateLookupFieldData
-from mock.mock import MagicMock, patch
 from opaque_keys.edx.keys import CourseKey
 from pytz import UTC
 from xmodule.fields import Date

lms/djangoapps/mobile_api/tests/test_course_info_serializers.py

@@ -1,11 +1,11 @@
 """
 Tests for serializers for the Mobile Course Info
 """
+from unittest.mock import MagicMock, Mock, patch
+from typing import Dict, List, Tuple, Union
 
 import ddt
 from django.test import TestCase
-from mock import MagicMock, Mock, patch
-from typing import Dict, List, Tuple, Union
 
 from common.djangoapps.student.tests.factories import UserFactory
 from lms.djangoapps.mobile_api.course_info.serializers import (

lms/djangoapps/mobile_api/tests/test_course_info_views.py

@@ -1,6 +1,7 @@
 """
 Tests for course_info
 """
+from unittest.mock import patch
 
 
 import ddt
@@ -11,7 +12,6 @@
 from django.urls import reverse
 from edx_toggles.toggles.testutils import override_waffle_flag
 from milestones.tests.utils import MilestonesTestCaseMixin
-from mock import patch
 from rest_framework import status
 
 from common.djangoapps.student.tests.factories import UserFactory  # pylint: disable=unused-import

openedx/core/djangoapps/catalog/tests/test_api.py

@@ -1,7 +1,7 @@
 """
 Tests for the Catalog apps `api.py` functions.
 """
-from mock import patch
+from unittest.mock import patch
 
 from django.test import TestCase
 

openedx/core/djangoapps/content/course_overviews/tests/test_api.py

@@ -1,7 +1,7 @@
 """
 course_overview api tests
 """
-from mock import patch
+from unittest.mock import patch
 
 from django.http.response import Http404
 from opaque_keys.edx.keys import CourseKey

openedx/core/djangoapps/discussions/tests/test_tasks.py

@@ -1,8 +1,9 @@
 """
 Tests for discussions tasks.
 """
+from unittest import mock
+
 import ddt
-import mock
 from edx_toggles.toggles.testutils import override_waffle_flag
 from openedx_events.learning.data import DiscussionTopicContext
 

scripts/user_retirement/tests/test_get_learners_to_retire.py

@@ -1,11 +1,11 @@
 """
 Test the get_learners_to_retire.py script
 """
+from unittest.mock import DEFAULT, patch
 
 import os
 
 from click.testing import CliRunner
-from mock import DEFAULT, patch
 from requests.exceptions import HTTPError
 
 from scripts.user_retirement.get_learners_to_retire import get_learners_to_retire

scripts/user_retirement/tests/test_retire_one_learner.py

@@ -1,9 +1,9 @@
 """
 Test the retire_one_learner.py script
 """
+from unittest.mock import DEFAULT, patch
 
 from click.testing import CliRunner
-from mock import DEFAULT, patch
 
 from scripts.user_retirement.retire_one_learner import (
     END_STATES,

scripts/user_retirement/tests/test_retirement_archive_and_cleanup.py

@@ -4,12 +4,12 @@
 
 import datetime
 import os
+from unittest.mock import DEFAULT, call, patch
 
 import boto3
 import pytest
 from botocore.exceptions import ClientError
 from click.testing import CliRunner
-from mock import DEFAULT, call, patch
 from moto import mock_ec2, mock_s3
 
 from scripts.user_retirement.retirement_archive_and_cleanup import (

scripts/user_retirement/tests/test_retirement_bulk_status_update.py

@@ -1,9 +1,9 @@
 """
 Test the retirement_bulk_status_update.py script
 """
+from unittest.mock import DEFAULT, patch
 
 from click.testing import CliRunner
-from mock import DEFAULT, patch
 
 from scripts.user_retirement.retirement_bulk_status_update import (
     ERR_BAD_CONFIG,

scripts/user_retirement/tests/test_retirement_partner_report.py

@@ -8,9 +8,9 @@
 import time
 import unicodedata
 from datetime import date
+from unittest.mock import DEFAULT, patch
 
 from click.testing import CliRunner
-from mock import DEFAULT, patch
 from six import PY2, itervalues
 
 from scripts.user_retirement.retirement_partner_report import \

scripts/user_retirement/tests/utils/test_edx_api.py

@@ -2,12 +2,12 @@
 Tests for edX API calls.
 """
 import unittest
+from unittest.mock import DEFAULT, patch
 from urllib.parse import urljoin
 
 import requests
 import responses
 from ddt import data, ddt, unpack
-from mock import DEFAULT, patch
 from requests.exceptions import ConnectionError, HTTPError
 from responses import GET, PATCH, POST, matchers
 from responses.registries import OrderedRegistry

scripts/user_retirement/tests/utils/test_jenkins.py

@@ -6,11 +6,11 @@
 import re
 import unittest
 from itertools import islice
+from unittest.mock import Mock, call, mock_open, patch
 
 import backoff
 import ddt
 import requests_mock
-from mock import Mock, call, mock_open, patch
 
 import scripts.user_retirement.utils.jenkins as jenkins
 from scripts.user_retirement.utils.exception import BackendError

scripts/user_retirement/tests/utils/thirdparty_apis/test_salesforce.py

@@ -3,8 +3,8 @@
 """
 import logging
 from contextlib import contextmanager
+from unittest import mock
 
-import mock
 import pytest
 from simple_salesforce import SalesforceError
 

scripts/user_retirement/tests/utils/thirdparty_apis/test_segment_api.py

@@ -2,8 +2,8 @@
 Tests for the Segment API functionality
 """
 import json
+from unittest import mock
 
-import mock
 import pytest
 import requests
 from six import text_type

xmodule/capa/tests/helpers.py

@@ -6,10 +6,10 @@
 import os
 import os.path
 import xml.sax.saxutils as saxutils
+from unittest.mock import MagicMock, Mock
 
 import fs.osfs
 from mako.lookup import TemplateLookup
-from mock import MagicMock, Mock
 from path import Path
 
 from xmodule.capa.capa_problem import LoncapaProblem, LoncapaSystem

xmodule/capa/tests/test_capa_problem.py

@@ -3,14 +3,14 @@
 """
 import textwrap
 import unittest
+from unittest.mock import patch, MagicMock
 
 from django.conf import settings
 from django.test import override_settings
 import pytest
 import ddt
 from lxml import etree
 from markupsafe import Markup
-from mock import patch, MagicMock
 
 from xmodule.capa.correctmap import CorrectMap
 from xmodule.capa.responsetypes import LoncapaProblemError

xmodule/capa/tests/test_html_render.py

@@ -6,9 +6,9 @@
 import os
 import textwrap
 import unittest
+from unittest import mock
 
 import ddt
-import mock
 from lxml import etree
 from xmodule.capa.tests.helpers import new_loncapa_problem, test_capa_system
 from openedx.core.djangolib.markup import HTML