require application credentials

by default in ~/.config/gcloud/application_default_credentials.json

Author: dfalbel

extensions/positron-python/python_files/posit/positron/tests/test_connections.py

@@ -46,7 +46,7 @@
 try:
     import google.cloud.bigquery
 
-    HAS_GOOGLE_BIGQUERY = True
+    HAS_GOOGLE_BIGQUERY = "GOOGLE_APPLICATION_CREDENTIALS" in os.environ
 except ImportError:
     HAS_GOOGLE_BIGQUERY = False