feat(genai/tuning): Add sample for canceling tuning jobs (#14483)

* feat: add support for canceling tuning jobs and include corresponding unit tests

* fix: suppress errors during GCS cleanup in tuning test teardown

* refactor: refine exception handling in tests and remove unreachable main execution block in tuning job cancel script

* refactor: move imports outside of tuning job cancellation function and add start marker

* refactor: reorder imports in test file and fix comment indentation in tuning job cancellation script

* refactor: cleanup GCS test utility and resolve imports in tuning examples

* style: cleanup whitespace in tuning job files

* fix: reorder imports in test_tuning_examples.py to resolve import sequence issues

Author: Kef131

genai/tuning/test_tuning_examples.py

@@ -13,14 +13,14 @@
 # limitations under the License.
 
 from datetime import datetime as dt
-
 from unittest.mock import call, MagicMock, patch
 
 from google.cloud import storage
 from google.genai import types
-import pytest
 
 import preference_tuning_job_create
+import pytest
+import tuning_job_cancel
 import tuning_job_create
 import tuning_job_get
 import tuning_job_list
@@ -89,6 +89,14 @@ def test_tuning_job_get(mock_genai_client: MagicMock) -> None:
     assert response == "test-tuning-job"
 
 
+@patch("google.genai.Client")
+def test_tuning_job_cancel(mock_genai_client: MagicMock) -> None:
+    tuning_job_cancel.cancel_tuning_job("test-tuning-job")
+
+    mock_genai_client.assert_called_once_with(http_options=types.HttpOptions(api_version="v1"))
+    mock_genai_client.return_value.tunings.cancel.assert_called_once_with(name="test-tuning-job")
+
+
 @patch("google.genai.Client")
 def test_tuning_job_list(mock_genai_client: MagicMock) -> None:
     # Mock the API response

genai/tuning/tuning_job_cancel.py

@@ -0,0 +1,29 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# [START googlegenaisdk_tuning_job_cancel]
+
+from google import genai
+from google.genai.types import HttpOptions
+
+
+def cancel_tuning_job(tuning_job_name: str) -> None:
+    client = genai.Client(http_options=HttpOptions(api_version="v1"))
+
+    # Cancel the tuning job.
+    # Eg. tuning_job_name = "projects/123456789012/locations/us-central1/tuningJobs/123456789012345"
+    client.tunings.cancel(name=tuning_job_name)
+
+
+# [END googlegenaisdk_tuning_job_cancel]