code: def setup_class(self):
      args = {"owner": "airflow", "start_date": DEFAULT_DATE}
      dag = DAG("test_dag_id", default_args=args)
      self.dag = dag
      db.merge_conn(
          Connection(
              conn_id="github_default",
              conn_type="github",
              password="my-access-token",
              host="https://mygithub.com/api/v3",
          )
      )
  
file_path: airflow/tests/providers/github/sensors/test_github.py
imports: from __future__ import annotations
  from unittest.mock import Mock, patch
  import pytest
  from airflow.models import Connection
  from airflow.models.dag import DAG
  from airflow.providers.github.sensors.github import GithubTagSensor
  from airflow.utils import db, timezone
label_desc: Use image node_id 1 for calling the TestGithubSensor obj's underlying member method code with example usage: obj.setup_class() without return types