refactor: port #561 split 'with_quota_project' into separate base class

Author: crwilcox

google/auth/_credentials_async.py

@@ -70,6 +70,10 @@ async def before_request(self, request, method, url, headers):
         self.apply(headers)
 
 
+class CredentialsWithQuotaProject(credentials.CredentialsWithQuotaProject):
+    """Abstract base for credentials supporting ``with_quota_project`` factory"""
+
+
 class AnonymousCredentials(credentials.AnonymousCredentials, Credentials):
     """Credentials that do not provide any authentication information.
 

tests_async/test__default_async.py

@@ -28,7 +28,7 @@
 import google.oauth2.credentials
 from tests import test__default as test_default
 
-MOCK_CREDENTIALS = mock.Mock(spec=credentials.Credentials)
+MOCK_CREDENTIALS = mock.Mock(spec=credentials.CredentialsWithQuotaProject)
 MOCK_CREDENTIALS.with_quota_project.return_value = MOCK_CREDENTIALS
 
 LOAD_FILE_PATCH = mock.patch(

tests_async/test_credentials_async.py

@@ -118,12 +118,6 @@ def test_anonymous_credentials_before_request():
     assert headers == {}
 
 
-def test_anonymous_credentials_with_quota_project():
-    with pytest.raises(ValueError):
-        anon = credentials.AnonymousCredentials()
-        anon.with_quota_project("project-foo")
-
-
 class ReadOnlyScopedCredentialsImpl(credentials.ReadOnlyScoped, CredentialsImpl):
     @property
     def requires_scopes(self):