code: def test_slack_init_token_channel_parameters():
      ch = SlackInput(
          "xoxb-test", "test", slack_signing_secret="foobar"
      )
      assert ch.slack_token == "xoxb-test"
      assert ch.slack_channel == "test"
      assert ch.conversation_granularity == "sender"
  
imports: from http import HTTPStatus
  import json
  import logging
  import time
  from typing import Any, Dict, Text
  from unittest import mock
  from unittest.mock import Mock, patch
  from aioresponses import aioresponses
  import pytest
  from sanic.compat import Header
  from sanic.request import Request
  from rasa.core.channels import SlackInput
  from rasa.core.channels.channel import UserMessage
  from rasa.shared.exceptions import InvalidConfigException
  from tests.utilities import json_of_latest_request, latest_request
label_desc: Use image node_id 9 for calling a global function with example usage: test_slack_init_token_channel_parameters() without return types