diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index c5a740cc..d5188bb9 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -21,7 +21,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install pytest pytest-mock
-          pip install -e py/[full]
+          pip install -e py/.[full]
       - name: Test with pytest
         run: |
           pytest py/tests/unit/*.py
diff --git a/py/tests/unit/test_api_clients.py b/py/tests/unit/test_api_clients.py
index 36b2ddf5..cead47be 100644
--- a/py/tests/unit/test_api_clients.py
+++ b/py/tests/unit/test_api_clients.py
@@ -16,12 +16,21 @@
 
 import pytest
 import tenacity
+from google import auth
 from google.ads.googleads import client as googleads_client
 from google.api_core import exceptions as google_exceptions
 
 from gaarf import api_clients
 
 
+def has_default_credentials():
+  try:
+    credentials, _ = auth.default()
+    return True
+  except auth.exceptions.DefaultCredentialsError:
+    return False
+
+
 class TestBaseClient:
   @pytest.fixture
   def client(self):
@@ -228,7 +237,7 @@ def fake_googleads_client(self, mocker):
     )
 
   @pytest.fixture
-  def test_client(self, mocker, config_path):
+  def test_client(self, mocker, fake_googleads_client, config_path):
     mocker.patch('google.ads.googleads.client.oauth2', return_value=[])
     mocker.patch(
       f'google.ads.googleads.{api_clients.GOOGLE_ADS_API_VERSION}'
@@ -240,8 +249,13 @@ def test_client(self, mocker, config_path):
         google_exceptions.InternalServerError('test'),
       ],
     )
-    return api_clients.GoogleAdsApiClient(path_to_config=config_path)
+    return api_clients.GoogleAdsApiClient(
+      path_to_config=config_path, ads_client=fake_googleads_client
+    )
 
+  @pytest.mark.skipif(
+    not has_default_credentials(), reason='Cannot found default credentials'
+  )
   def test_get_response_raises_internal_service_error_after_3_failed_retries(
     self, test_client
   ):
@@ -252,6 +266,9 @@ def test_get_response_raises_internal_service_error_after_3_failed_retries(
         query_text='SELECT customer.id FROM customer',
       )
 
+  @pytest.mark.skipif(
+    not has_default_credentials(), reason='Cannot found default credentials'
+  )
   def test_from_googleads_client_returns_new_instance(
     self, fake_googleads_client, caplog
   ):
@@ -270,6 +287,9 @@ def test_from_googleads_client_returns_new_instance(
       '"use_proto_plus=False"'
     ) not in caplog.text
 
+  @pytest.mark.skipif(
+    not has_default_credentials(), reason='Cannot found default credentials'
+  )
   def test_from_googleads_client_generates_warning_for_use_proto_plus(
     self, fake_googleads_client, caplog
   ):