Permit AppAssertionCredentials to specify the service account to use

tests/test_oauth2client_appengine.py

Index: tests/test_oauth2client_appengine.py 
=================================================================== 
--- a/tests/test_oauth2client_appengine.py 
+++ b/tests/test_oauth2client_appengine.py 
@@ -203,6 +203,23 @@ 
 'http://www.googleapis.com/scope http://www.googleapis.com/scope2', 
 credentials.scope) 
 
+ def test_custom_service_account(self): 
+ scope = "http://www.googleapis.com/scope" 
+ account_id = "service_account_name_2@appspot.com" 
+ m = mox.Mox() 
+ m.StubOutWithMock(app_identity, 'get_access_token') 
+ app_identity.get_access_token( 
+ [scope], service_account_id=account_id).AndReturn(('a_token_456', None)) 
+ m.ReplayAll() 
+ 
+ credentials = AppAssertionCredentials(scope, service_account_id=account_id) 
+ http = httplib2.Http() 
+ credentials.refresh(http) 
+ m.VerifyAll() 
+ m.UnsetStubs() 
+ self.assertEqual('a_token_456', credentials.access_token) 
+ self.assertEqual(scope, credentials.scope) 
+ 
 
 class TestFlowModel(db.Model): 
 flow = FlowProperty()