def METHOD_NAME(self):
    event_json = '{"hello": "world"}'
    self.events_lib_mock.generate_event.return_value = event_json
    s = EventTypeSubCommand(self.events_lib_mock, "hello", event_json)
    event = s.cmd_implementation(self.events_lib_mock, self.service_cmd_name, self.event_type_name, {})
    self.events_lib_mock.generate_event.assert_called_with(self.service_cmd_name, self.event_type_name, {})
    self.assertEqual(event, event_json)