diff --git a/gapic/ads-templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2 b/gapic/ads-templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
index 061c7dc987..4a158a4905 100644
--- a/gapic/ads-templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
+++ b/gapic/ads-templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
@@ -395,6 +395,7 @@ def test_{{ service.client_name|snake_case }}_client_options_credentials_file(cl
             always_use_jwt_access=True,
         )
 
+    {% if 'grpc' in opts.transport %}
     # test that the credentials from file are saved and used as the credentials.
     with mock.patch.object(
         google.auth, "load_credentials_from_file", autospec=True
@@ -412,7 +413,6 @@ def test_{{ service.client_name|snake_case }}_client_options_credentials_file(cl
         create_channel.assert_called_with(
             "{{ host }}{% if ":" not in service.host %}:443{% endif %}",
             credentials=file_creds,
-            credentials_file=None,
             quota_project_id=None,
             default_scopes=(
                 {% for scope in service.oauth_scopes %}
@@ -427,6 +427,7 @@ def test_{{ service.client_name|snake_case }}_client_options_credentials_file(cl
             ],
         )
         {% endwith %}
+    {% endif %}
 {% if 'grpc' in opts.transport %}
 {# TODO(dovs): genericize this function#}
 
@@ -1707,7 +1708,6 @@ def test_{{ service.name|snake_case }}_transport_create_channel(transport_class,
         create_channel.assert_called_with(
             "{{ host }}{% if ":" not in service.host %}:443{% endif %}",
             credentials=creds,
-            credentials_file=None,
             quota_project_id="octopus",
             default_scopes=(
                 {% for scope in service.oauth_scopes %}
diff --git a/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2 b/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
index c14e6e8373..34f9493bcf 100644
--- a/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
+++ b/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
@@ -453,7 +453,7 @@ def test_{{ service.client_name|snake_case }}_client_options_scopes(client_class
     ({{ service.async_client_name }}, transports.{{ service.grpc_asyncio_transport_name }}, "grpc_asyncio", grpc_helpers_async),
     {% endif %}
     {% if 'rest' in opts.transport %}
-    ({{ service.client_name }}, transports.{{ service.rest_transport_name }}, "rest"),
+    ({{ service.client_name }}, transports.{{ service.rest_transport_name }}, "rest", ""),
     {% endif %}
 ])
 def test_{{ service.client_name|snake_case }}_client_options_credentials_file(client_class, transport_class, transport_name, grpc_helpers):
@@ -476,6 +476,7 @@ def test_{{ service.client_name|snake_case }}_client_options_credentials_file(cl
             always_use_jwt_access=True,
         )
 
+    {% if 'grpc' in opts.transport %}
     # test that the credentials from file are saved and used as the credentials.
     with mock.patch.object(
         google.auth, "load_credentials_from_file", autospec=True
@@ -493,7 +494,6 @@ def test_{{ service.client_name|snake_case }}_client_options_credentials_file(cl
         create_channel.assert_called_with(
             "{{ host }}{% if ":" not in service.host %}:443{% endif %}",
             credentials=file_creds,
-            credentials_file=None,
             quota_project_id=None,
             default_scopes=(
                 {% for scope in service.oauth_scopes %}
@@ -508,6 +508,7 @@ def test_{{ service.client_name|snake_case }}_client_options_credentials_file(cl
             ],
         )
         {% endwith %}
+    {% endif %}
 {% if 'grpc' in opts.transport %}
 {# TODO(dovs): genericize this function#}
 
@@ -2138,7 +2139,6 @@ def test_{{ service.name|snake_case }}_transport_create_channel(transport_class,
         create_channel.assert_called_with(
             "{{ host }}{% if ":" not in service.host %}:443{% endif %}",
             credentials=creds,
-            credentials_file=None,
             quota_project_id="octopus",
             default_scopes=(
                 {% for scope in service.oauth_scopes %}
diff --git a/tests/integration/goldens/asset/tests/unit/gapic/asset_v1/test_asset_service.py b/tests/integration/goldens/asset/tests/unit/gapic/asset_v1/test_asset_service.py
index 8e0373ab44..cd27ee7948 100644
--- a/tests/integration/goldens/asset/tests/unit/gapic/asset_v1/test_asset_service.py
+++ b/tests/integration/goldens/asset/tests/unit/gapic/asset_v1/test_asset_service.py
@@ -434,7 +434,6 @@ def test_asset_service_client_client_options_credentials_file(client_class, tran
         create_channel.assert_called_with(
             "cloudasset.googleapis.com:443",
             credentials=file_creds,
-            credentials_file=None,
             quota_project_id=None,
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',
@@ -3784,7 +3783,6 @@ def test_asset_service_transport_create_channel(transport_class, grpc_helpers):
         create_channel.assert_called_with(
             "cloudasset.googleapis.com:443",
             credentials=creds,
-            credentials_file=None,
             quota_project_id="octopus",
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',
diff --git a/tests/integration/goldens/credentials/tests/unit/gapic/credentials_v1/test_iam_credentials.py b/tests/integration/goldens/credentials/tests/unit/gapic/credentials_v1/test_iam_credentials.py
index 017b8cad45..fb7d416799 100644
--- a/tests/integration/goldens/credentials/tests/unit/gapic/credentials_v1/test_iam_credentials.py
+++ b/tests/integration/goldens/credentials/tests/unit/gapic/credentials_v1/test_iam_credentials.py
@@ -425,7 +425,6 @@ def test_iam_credentials_client_client_options_credentials_file(client_class, tr
         create_channel.assert_called_with(
             "iamcredentials.googleapis.com:443",
             credentials=file_creds,
-            credentials_file=None,
             quota_project_id=None,
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',
@@ -1714,7 +1713,6 @@ def test_iam_credentials_transport_create_channel(transport_class, grpc_helpers)
         create_channel.assert_called_with(
             "iamcredentials.googleapis.com:443",
             credentials=creds,
-            credentials_file=None,
             quota_project_id="octopus",
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',
diff --git a/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_config_service_v2.py b/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_config_service_v2.py
index 87493338ce..6e2c987699 100644
--- a/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_config_service_v2.py
+++ b/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_config_service_v2.py
@@ -426,7 +426,6 @@ def test_config_service_v2_client_client_options_credentials_file(client_class,
         create_channel.assert_called_with(
             "logging.googleapis.com:443",
             credentials=file_creds,
-            credentials_file=None,
             quota_project_id=None,
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',
@@ -6173,7 +6172,6 @@ def test_config_service_v2_transport_create_channel(transport_class, grpc_helper
         create_channel.assert_called_with(
             "logging.googleapis.com:443",
             credentials=creds,
-            credentials_file=None,
             quota_project_id="octopus",
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',
diff --git a/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_logging_service_v2.py b/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_logging_service_v2.py
index e2668aac46..bea40d2ab8 100644
--- a/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_logging_service_v2.py
+++ b/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_logging_service_v2.py
@@ -432,7 +432,6 @@ def test_logging_service_v2_client_client_options_credentials_file(client_class,
         create_channel.assert_called_with(
             "logging.googleapis.com:443",
             credentials=file_creds,
-            credentials_file=None,
             quota_project_id=None,
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',
@@ -2260,7 +2259,6 @@ def test_logging_service_v2_transport_create_channel(transport_class, grpc_helpe
         create_channel.assert_called_with(
             "logging.googleapis.com:443",
             credentials=creds,
-            credentials_file=None,
             quota_project_id="octopus",
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',
diff --git a/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_metrics_service_v2.py b/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_metrics_service_v2.py
index eb91c00caf..d6721f9a70 100644
--- a/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_metrics_service_v2.py
+++ b/tests/integration/goldens/logging/tests/unit/gapic/logging_v2/test_metrics_service_v2.py
@@ -430,7 +430,6 @@ def test_metrics_service_v2_client_client_options_credentials_file(client_class,
         create_channel.assert_called_with(
             "logging.googleapis.com:443",
             credentials=file_creds,
-            credentials_file=None,
             quota_project_id=None,
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',
@@ -2113,7 +2112,6 @@ def test_metrics_service_v2_transport_create_channel(transport_class, grpc_helpe
         create_channel.assert_called_with(
             "logging.googleapis.com:443",
             credentials=creds,
-            credentials_file=None,
             quota_project_id="octopus",
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',
diff --git a/tests/integration/goldens/redis/tests/unit/gapic/redis_v1/test_cloud_redis.py b/tests/integration/goldens/redis/tests/unit/gapic/redis_v1/test_cloud_redis.py
index 087858c344..38b42de9b7 100644
--- a/tests/integration/goldens/redis/tests/unit/gapic/redis_v1/test_cloud_redis.py
+++ b/tests/integration/goldens/redis/tests/unit/gapic/redis_v1/test_cloud_redis.py
@@ -431,7 +431,6 @@ def test_cloud_redis_client_client_options_credentials_file(client_class, transp
         create_channel.assert_called_with(
             "redis.googleapis.com:443",
             credentials=file_creds,
-            credentials_file=None,
             quota_project_id=None,
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',
@@ -3109,7 +3108,6 @@ def test_cloud_redis_transport_create_channel(transport_class, grpc_helpers):
         create_channel.assert_called_with(
             "redis.googleapis.com:443",
             credentials=creds,
-            credentials_file=None,
             quota_project_id="octopus",
             default_scopes=(
                 'https://www.googleapis.com/auth/cloud-platform',