test: add google credentials unit test

tests/test_google_credentials.py

@@ -1,4 +1,26 @@
-from toucan_connectors.google_credentials import GoogleCredentials
+from pytest_mock import MockFixture
+
+from toucan_connectors.google_credentials import GoogleCredentials, get_google_oauth2_credentials
+
+
+def test_google_credentials(mocker: MockFixture):
+    conf = {
+        'type': 'service_account',
+        'project_id': 'my_project_id',
+        'private_key_id': 'my_private_key_id',
+        'private_key': '-----BEGIN PRIVATE KEY-----\naaa\nbbb\n-----END PRIVATE KEY-----\n',
+        'client_email': 'my_client_email',
+        'client_id': 'my_client_id',
+        'auth_uri': 'https://accounts.google.com/o/oauth2/auth',
+        'token_uri': 'https://oauth2.googleapis.com/token',
+        'auth_provider_x509_cert_url': 'https://www.googleapis.com/oauth2/v1/certs',
+        'client_x509_cert_url': 'https://www.googleapis.com/robot/v1/metadata/x509/xxx.iam.gserviceaccount.com',  # noqa: E501
+    }
+    credentials = GoogleCredentials(**conf)
+    # Ensure `Credentials` is called with the right values of secrets
+    mock_credentials = mocker.patch('toucan_connectors.google_credentials.Credentials')
+    get_google_oauth2_credentials(credentials)
+    mock_credentials.from_service_account_info.assert_called_once_with(conf)
 
 
 def test_unespace_break_lines():

toucan_connectors/google_credentials.py

@@ -1,3 +1,4 @@
+from google.oauth2.service_account import Credentials
 from pydantic import BaseModel, Field, HttpUrl, validator
 
 CREDENTIALS_INFO_MESSAGE = (
@@ -53,7 +54,5 @@ def unescape_break_lines(cls, v):
         return v.replace('\\n', '\n')
 
 
-def get_google_oauth2_credentials(google_credentials):
-    from google.oauth2.service_account import Credentials
-
+def get_google_oauth2_credentials(google_credentials: GoogleCredentials) -> Credentials:
     return Credentials.from_service_account_info(google_credentials.dict())