diff -Nru google-api-core-2.19.0.orig/tests/asyncio/future/test_async_future.py google-api-core-2.19.0/tests/asyncio/future/test_async_future.py
--- google-api-core-2.19.0.orig/tests/asyncio/future/test_async_future.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/asyncio/future/test_async_future.py	2024-05-16 16:03:34.320181259 +0200
@@ -14,7 +14,7 @@
 
 import asyncio
 
-import mock
+from unittest import mock
 import pytest
 
 from google.api_core import exceptions
diff -Nru google-api-core-2.19.0.orig/tests/asyncio/gapic/test_method_async.py google-api-core-2.19.0/tests/asyncio/gapic/test_method_async.py
--- google-api-core-2.19.0.orig/tests/asyncio/gapic/test_method_async.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/asyncio/gapic/test_method_async.py	2024-05-16 16:03:34.310181235 +0200
@@ -14,7 +14,7 @@
 
 import datetime
 
-import mock
+from unittest import mock
 import pytest
 
 try:
diff -Nru google-api-core-2.19.0.orig/tests/asyncio/operations_v1/test_operations_async_client.py google-api-core-2.19.0/tests/asyncio/operations_v1/test_operations_async_client.py
--- google-api-core-2.19.0.orig/tests/asyncio/operations_v1/test_operations_async_client.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/asyncio/operations_v1/test_operations_async_client.py	2024-05-16 16:03:34.300181212 +0200
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import mock
+from unittest import mock
 import pytest
 
 try:
diff -Nru google-api-core-2.19.0.orig/tests/asyncio/retry/test_retry_streaming_async.py google-api-core-2.19.0/tests/asyncio/retry/test_retry_streaming_async.py
--- google-api-core-2.19.0.orig/tests/asyncio/retry/test_retry_streaming_async.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/asyncio/retry/test_retry_streaming_async.py	2024-05-16 16:03:34.296847871 +0200
@@ -16,7 +16,7 @@
 import re
 import asyncio
 
-import mock
+from unittest import mock
 import pytest
 
 from google.api_core import exceptions
diff -Nru google-api-core-2.19.0.orig/tests/asyncio/retry/test_retry_unary_async.py google-api-core-2.19.0/tests/asyncio/retry/test_retry_unary_async.py
--- google-api-core-2.19.0.orig/tests/asyncio/retry/test_retry_unary_async.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/asyncio/retry/test_retry_unary_async.py	2024-05-16 16:03:34.293514530 +0200
@@ -15,7 +15,7 @@
 import datetime
 import re
 
-import mock
+from unittest import mock
 import pytest
 
 from google.api_core import exceptions
diff -Nru google-api-core-2.19.0.orig/tests/asyncio/test_grpc_helpers_async.py google-api-core-2.19.0/tests/asyncio/test_grpc_helpers_async.py
--- google-api-core-2.19.0.orig/tests/asyncio/test_grpc_helpers_async.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/asyncio/test_grpc_helpers_async.py	2024-05-16 16:03:34.286847847 +0200
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import mock
+from unittest import mock
 import pytest  # noqa: I202
 
 try:
diff -Nru google-api-core-2.19.0.orig/tests/asyncio/test_operation_async.py google-api-core-2.19.0/tests/asyncio/test_operation_async.py
--- google-api-core-2.19.0.orig/tests/asyncio/test_operation_async.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/asyncio/test_operation_async.py	2024-05-16 16:03:34.316847918 +0200
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 
-import mock
+from unittest import mock
 import pytest
 
 try:
diff -Nru google-api-core-2.19.0.orig/tests/asyncio/test_page_iterator_async.py google-api-core-2.19.0/tests/asyncio/test_page_iterator_async.py
--- google-api-core-2.19.0.orig/tests/asyncio/test_page_iterator_async.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/asyncio/test_page_iterator_async.py	2024-05-16 16:03:34.283514506 +0200
@@ -14,7 +14,7 @@
 
 import inspect
 
-import mock
+from unittest import mock
 import pytest
 
 from google.api_core import page_iterator_async
diff -Nru google-api-core-2.19.0.orig/tests/unit/future/test__helpers.py google-api-core-2.19.0/tests/unit/future/test__helpers.py
--- google-api-core-2.19.0.orig/tests/unit/future/test__helpers.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/future/test__helpers.py	2024-05-16 16:03:34.433514858 +0200
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import mock
+from unittest import mock
 
 from google.api_core.future import _helpers
 
diff -Nru google-api-core-2.19.0.orig/tests/unit/future/test_polling.py google-api-core-2.19.0/tests/unit/future/test_polling.py
--- google-api-core-2.19.0.orig/tests/unit/future/test_polling.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/future/test_polling.py	2024-05-16 16:03:34.433514858 +0200
@@ -16,7 +16,7 @@
 import threading
 import time
 
-import mock
+from unittest import mock
 import pytest
 
 from google.api_core import exceptions, retry
diff -Nru google-api-core-2.19.0.orig/tests/unit/gapic/test_method.py google-api-core-2.19.0/tests/unit/gapic/test_method.py
--- google-api-core-2.19.0.orig/tests/unit/gapic/test_method.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/gapic/test_method.py	2024-05-16 16:03:34.413514811 +0200
@@ -14,7 +14,7 @@
 
 import datetime
 
-import mock
+from unittest import mock
 import pytest
 
 try:
diff -Nru google-api-core-2.19.0.orig/tests/unit/operations_v1/test_operations_rest_client.py google-api-core-2.19.0/tests/unit/operations_v1/test_operations_rest_client.py
--- google-api-core-2.19.0.orig/tests/unit/operations_v1/test_operations_rest_client.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/operations_v1/test_operations_rest_client.py	2024-05-16 16:03:34.393514764 +0200
@@ -15,7 +15,7 @@
 #
 import os
 
-import mock
+from unittest import mock
 import pytest
 
 try:
diff -Nru google-api-core-2.19.0.orig/tests/unit/retry/test_retry_base.py google-api-core-2.19.0/tests/unit/retry/test_retry_base.py
--- google-api-core-2.19.0.orig/tests/unit/retry/test_retry_base.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/retry/test_retry_base.py	2024-05-16 16:03:34.380181399 +0200
@@ -15,7 +15,7 @@
 import itertools
 import re
 
-import mock
+from unittest import mock
 import pytest
 import requests.exceptions
 
diff -Nru google-api-core-2.19.0.orig/tests/unit/retry/test_retry_streaming.py google-api-core-2.19.0/tests/unit/retry/test_retry_streaming.py
--- google-api-core-2.19.0.orig/tests/unit/retry/test_retry_streaming.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/retry/test_retry_streaming.py	2024-05-16 16:03:34.376848059 +0200
@@ -14,7 +14,7 @@
 
 import re
 
-import mock
+from unittest import mock
 import pytest
 
 from google.api_core import exceptions
diff -Nru google-api-core-2.19.0.orig/tests/unit/retry/test_retry_unary.py google-api-core-2.19.0/tests/unit/retry/test_retry_unary.py
--- google-api-core-2.19.0.orig/tests/unit/retry/test_retry_unary.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/retry/test_retry_unary.py	2024-05-16 16:03:34.386848082 +0200
@@ -15,7 +15,7 @@
 import datetime
 import re
 
-import mock
+from unittest import mock
 import pytest
 
 from google.api_core import exceptions
diff -Nru google-api-core-2.19.0.orig/tests/unit/test_bidi.py google-api-core-2.19.0/tests/unit/test_bidi.py
--- google-api-core-2.19.0.orig/tests/unit/test_bidi.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/test_bidi.py	2024-05-16 16:03:34.326847941 +0200
@@ -17,7 +17,7 @@
 import queue
 import threading
 
-import mock
+from unittest import mock
 import pytest
 
 try:
diff -Nru google-api-core-2.19.0.orig/tests/unit/test_exceptions.py google-api-core-2.19.0/tests/unit/test_exceptions.py
--- google-api-core-2.19.0.orig/tests/unit/test_exceptions.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/test_exceptions.py	2024-05-16 16:03:34.403514788 +0200
@@ -15,7 +15,7 @@
 import http.client
 import json
 
-import mock
+from unittest import mock
 import pytest
 import requests
 
diff -Nru google-api-core-2.19.0.orig/tests/unit/test_extended_operation.py google-api-core-2.19.0/tests/unit/test_extended_operation.py
--- google-api-core-2.19.0.orig/tests/unit/test_extended_operation.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/test_extended_operation.py	2024-05-16 16:03:34.353514670 +0200
@@ -16,7 +16,7 @@
 import enum
 import typing
 
-import mock
+from unittest import mock
 import pytest
 
 from google.api_core import exceptions
diff -Nru google-api-core-2.19.0.orig/tests/unit/test_grpc_helpers.py google-api-core-2.19.0/tests/unit/test_grpc_helpers.py
--- google-api-core-2.19.0.orig/tests/unit/test_grpc_helpers.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/test_grpc_helpers.py	2024-05-16 16:03:34.373514717 +0200
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import mock
+from unittest import mock
 import pytest
 
 try:
diff -Nru google-api-core-2.19.0.orig/tests/unit/test_operation.py google-api-core-2.19.0/tests/unit/test_operation.py
--- google-api-core-2.19.0.orig/tests/unit/test_operation.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/test_operation.py	2024-05-16 16:03:34.340181306 +0200
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 
-import mock
+from unittest import mock
 import pytest
 
 try:
diff -Nru google-api-core-2.19.0.orig/tests/unit/test_page_iterator.py google-api-core-2.19.0/tests/unit/test_page_iterator.py
--- google-api-core-2.19.0.orig/tests/unit/test_page_iterator.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/test_page_iterator.py	2024-05-16 16:03:34.333514624 +0200
@@ -15,7 +15,7 @@
 import math
 import types
 
-import mock
+from unittest import mock
 import pytest
 
 from google.api_core import page_iterator
diff -Nru google-api-core-2.19.0.orig/tests/unit/test_path_template.py google-api-core-2.19.0/tests/unit/test_path_template.py
--- google-api-core-2.19.0.orig/tests/unit/test_path_template.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/test_path_template.py	2024-05-16 16:03:34.333514624 +0200
@@ -14,7 +14,7 @@
 
 from __future__ import unicode_literals
 
-import mock
+from unittest import mock
 import pytest
 
 from google.api import auth_pb2
diff -Nru google-api-core-2.19.0.orig/tests/unit/test_timeout.py google-api-core-2.19.0/tests/unit/test_timeout.py
--- google-api-core-2.19.0.orig/tests/unit/test_timeout.py	2024-04-30 19:00:19.000000000 +0200
+++ google-api-core-2.19.0/tests/unit/test_timeout.py	2024-05-16 16:03:34.426848175 +0200
@@ -15,7 +15,7 @@
 import datetime
 import itertools
 
-import mock
+from unittest import mock
 
 from google.api_core import timeout as timeouts