docstr: Test `SlackWebhookHook.send` method.
docstr_tok: ["Test","`","SlackWebhookHook.send","`","method","."]
code: def test_hook_send(self, mock_hook_send_dict, send_params, headers):
      """Test `SlackWebhookHook.send` method."""
      hook = SlackWebhookHook(slack_webhook_conn_id=TEST_CONN_ID)
      hook.send(**send_params, headers=headers)
      mock_hook_send_dict.assert_called_once_with(
          body=send_params, headers=headers
      )
  
imports: from __future__ import annotations
  import json
  import os
  from typing import Any
  from unittest import mock
  from unittest.mock import patch
  import pytest
  from slack_sdk.http_retry.builtin_handlers import ConnectionErrorRetryHandler, RateLimitErrorRetryHandler
  from slack_sdk.webhook.webhook_response import WebhookResponse
  from airflow.exceptions import AirflowException, AirflowNotFoundException
  from airflow.models.connection import Connection
  from airflow.providers.slack.hooks.slack_webhook import SlackWebhookHook, check_webhook_response
label_desc: Use image node_id 11 for calling the TestSlackWebhookHook obj's underlying member method code with example usage: obj.test_hook_send(mock_hook_send_dict, send_params, headers) without return types