diff --git a/zulip_botserver/tests/server_test_lib.py b/zulip_botserver/tests/server_test_lib.py
index 2edef9a..cb365c5 100644
--- a/zulip_botserver/tests/server_test_lib.py
+++ b/zulip_botserver/tests/server_test_lib.py
@@ -17,7 +17,7 @@ class BotServerTestCase(TestCase):
         available_bots: Optional[List[str]]=None,
         bots_config: Optional[Dict[str, Dict[str, str]]]=None,
         bot_handlers: Optional[Dict[str, Any]]=None,
-        message: Optional[Dict[str, Any]]=None,
+        event: Optional[Dict[str, Any]]=None,
         check_success: bool=False,
         third_party_bot_conf: Optional[configparser.ConfigParser]=None,
     ) -> None:
@@ -31,7 +31,7 @@ class BotServerTestCase(TestCase):
             server.app.config["BOT_HANDLERS"] = bot_handlers
             server.app.config["MESSAGE_HANDLERS"] = message_handlers
 
-        response = self.app.post(data=json.dumps(message))
+        response = self.app.post(data=json.dumps(event))
 
         if check_success:
             assert 200 <= response.status_code < 300
diff --git a/zulip_botserver/tests/test_server.py b/zulip_botserver/tests/test_server.py
index 1369d26..964922b 100644
--- a/zulip_botserver/tests/test_server.py
+++ b/zulip_botserver/tests/test_server.py
@@ -31,8 +31,8 @@ class BotServerTests(BotServerTestCase):
         }
         self.assert_bot_server_response(available_bots=available_bots,
                                         bots_config=bots_config,
-                                        message=dict(message={'content': "test message"},
-                                                     bot_email='helloworld-bot@zulip.com'),
+                                        event=dict(message={'content': "test message"},
+                                                   bot_email='helloworld-bot@zulip.com'),
                                         check_success=True)
 
     @mock.patch('zulip_bots.lib.ExternalBotHandler')
@@ -51,15 +51,15 @@ class BotServerTests(BotServerTestCase):
             }
         }
         self.assert_bot_server_response(available_bots=available_bots,
-                                        message=dict(message={'content': "test message"},
-                                                     bot_email='helloworld-bot@zulip.com'),
+                                        event=dict(message={'content': "test message"},
+                                                   bot_email='helloworld-bot@zulip.com'),
                                         bots_config=bots_config,
                                         check_success=True)
 
     def test_bot_module_not_exists(self) -> None:
         self.assert_bot_server_response(available_bots=[],
-                                        message=dict(message={'content': "test message"},
-                                                     bot_email='nonexistent-bot@zulip.com'),
+                                        event=dict(message={'content': "test message"},
+                                                   bot_email='nonexistent-bot@zulip.com'),
                                         check_success=False)
 
     @mock.patch('logging.error')
@@ -81,8 +81,8 @@ class BotServerTests(BotServerTestCase):
                               "make sure you have set up the flaskbotrc file correctly.",
                               lambda: self.assert_bot_server_response(
                                   available_bots=available_bots,
-                                  message=dict(message={'content': "test message"},
-                                               bot_email='helloworld-bot@zulip.com'),
+                                  event=dict(message={'content': "test message"},
+                                             bot_email='helloworld-bot@zulip.com'),
                                   bots_config=bots_config))
 
     @mock.patch('sys.argv', ['zulip-bot-server', '--config-file', '/foo/bar/baz.conf'])