diff --git a/owlbot.py b/owlbot.py
index b412127e..99d99b19 100644
--- a/owlbot.py
+++ b/owlbot.py
@@ -125,4 +125,4 @@
 
 # run format session for all directories which have a noxfile
 for noxfile in Path(".").glob("**/noxfile.py"):
-    s.shell.run(["nox", "-s", "blacken"], cwd=noxfile.parent, hide_output=False)
\ No newline at end of file
+    s.shell.run(["nox", "-s", "format"], cwd=noxfile.parent, hide_output=False)
diff --git a/samples/snippets/append_rows_pending_test.py b/samples/snippets/append_rows_pending_test.py
index 9af69570..e6b1173e 100644
--- a/samples/snippets/append_rows_pending_test.py
+++ b/samples/snippets/append_rows_pending_test.py
@@ -19,8 +19,6 @@
 
 from google.cloud import bigquery
 
-from . import append_rows_pending
-
 DIR = pathlib.Path(__file__).parent
 
 
diff --git a/samples/snippets/append_rows_proto2_test.py b/samples/snippets/append_rows_proto2_test.py
index 904f17dd..fd45ab2f 100644
--- a/samples/snippets/append_rows_proto2_test.py
+++ b/samples/snippets/append_rows_proto2_test.py
@@ -21,8 +21,6 @@
 
 from google.cloud import bigquery
 
-from . import append_rows_proto2
-
 DIR = pathlib.Path(__file__).parent
 
 
diff --git a/samples/snippets/conftest.py b/samples/snippets/conftest.py
index a186291e..d60749a1 100644
--- a/samples/snippets/conftest.py
+++ b/samples/snippets/conftest.py
@@ -15,8 +15,6 @@
 import pytest
 import test_utils.prefixer
 
-from google.cloud import bigquery
-
 prefixer = test_utils.prefixer.Prefixer("python-bigquery-storage", "samples/snippets")
 
 
diff --git a/tests/unit/test_writer_v1.py b/tests/unit/test_writer_v1.py
index 7ff4e3c3..cb112342 100644
--- a/tests/unit/test_writer_v1.py
+++ b/tests/unit/test_writer_v1.py
@@ -15,14 +15,13 @@
 import time
 from unittest import mock
 
-import pytest
-
 from google.api_core import exceptions
-from google.cloud.bigquery_storage_v1.services import big_query_write
-from google.cloud.bigquery_storage_v1 import types as gapic_types
-from google.cloud.bigquery_storage_v1 import exceptions as bqstorage_exceptions
 from google.protobuf import descriptor_pb2
+import pytest
 
+from google.cloud.bigquery_storage_v1 import exceptions as bqstorage_exceptions
+from google.cloud.bigquery_storage_v1 import types as gapic_types
+from google.cloud.bigquery_storage_v1.services import big_query_write
 
 REQUEST_TEMPLATE = gapic_types.AppendRowsRequest()