Use an envvar for the iam user

Author: sethvargo

secretmanager/api-client/snippets_test.py

@@ -47,7 +47,7 @@ def project_id():
 
 @pytest.fixture()
 def iam_user():
-    return 'user:[email protected]'
+    return 'serviceAccount:' + os.environ['GCLOUD_SECRETS_SERVICE_ACCOUNT']
 
 
 @pytest.fixture()