diff --git a/zerver/webhooks/transifex/tests.py b/zerver/webhooks/transifex/tests.py
index f5ae9560f0..127ccb636e 100644
--- a/zerver/webhooks/transifex/tests.py
+++ b/zerver/webhooks/transifex/tests.py
@@ -25,7 +25,7 @@ class TransifexHookTests(WebhookTestCase):
             language=self.LANGUAGE,
             resource=self.RESOURCE,
         )
-        self.send_and_test_stream_message(None, expected_subject, expected_message)
+        self.send_and_test_stream_message("", expected_subject, expected_message)
 
     def test_transifex_translated_message(self):
         # type: () -> None
@@ -38,8 +38,7 @@ class TransifexHookTests(WebhookTestCase):
             language=self.LANGUAGE,
             resource=self.RESOURCE,
         )
-        self.send_and_test_stream_message(None, expected_subject, expected_message)
-        self.REVIEWED = True
+        self.send_and_test_stream_message("", expected_subject, expected_message)
 
     def get_body(self, fixture_name):
         # type: (Text) -> Dict[str, Any]
diff --git a/zerver/webhooks/zendesk/tests.py b/zerver/webhooks/zendesk/tests.py
index 063316d2a8..e55f0159ca 100644
--- a/zerver/webhooks/zendesk/tests.py
+++ b/zerver/webhooks/zendesk/tests.py
@@ -27,7 +27,7 @@ class ZenDeskHookTests(WebhookTestCase):
 
     def do_test(self, expected_subject=None, expected_message=None):
         # type: (Optional[Text], Optional[Text]) -> None
-        self.send_and_test_stream_message(None, expected_subject, expected_message,
+        self.send_and_test_stream_message("", expected_subject, expected_message,
                                           content_type=None, **self.api_auth(self.TEST_USER_EMAIL))
         self.TICKET_TITLE = self.DEFAULT_TICKET_TITLE
         self.TICKET_ID = self.DEFAULT_TICKET_ID