code: def test_get_conn_no_connection_found(self, mock_get_connection):
      with pytest.raises(AirflowWebHDFSHookException):
          self.webhdfs_hook.get_conn()
  
imports: from __future__ import annotations
  from unittest.mock import call, patch
  import pytest
  from hdfs import HdfsError
  from airflow.models.connection import Connection
  from airflow.providers.apache.hdfs.hooks.webhdfs import AirflowWebHDFSHookException, WebHDFSHook
label_desc: Use image node_id 7 for calling the TestWebHDFSHook obj's underlying member method code with example usage: obj.test_get_conn_no_connection_found(mock_get_connection) without return types