code: def test_execute_hello(self):
      operator = RedisPublishOperator(
          task_id="test_task",
          dag=self.dag,
          message="hello",
          channel=self.channel,
          redis_conn_id="redis_default",
      )
  
      hook = RedisHook(redis_conn_id="redis_default")
      pubsub = hook.get_conn().pubsub()
      pubsub.subscribe(self.channel)
  
      operator.execute(self.mock_context)
      context_calls = []
      assert (
          self.mock_context["ti"].method_calls == context_calls
      ), "context calls should be same"
  
      message = pubsub.get_message()
      assert message["type"] == "subscribe"
  
      message = pubsub.get_message()
      assert message["type"] == "message"
      assert message["data"] == b"hello"
  
      pubsub.unsubscribe(self.channel)
  
file_path: airflow/tests/integration/providers/redis/operators/test_redis_publish.py
imports: from __future__ import annotations
  from unittest.mock import MagicMock
  import pytest
  from airflow.models.dag import DAG
  from airflow.providers.redis.hooks.redis import RedisHook
  from airflow.providers.redis.operators.redis_publish import RedisPublishOperator
  from airflow.utils import timezone
label_desc: Use image node_id 2 for calling the TestRedisPublishOperator obj's underlying member method code with example usage: obj.test_execute_hello() without return types