code: def test_init_proxy_user(self):
      hook = WebHDFSHook(proxy_user="someone")
      assert "someone" == hook.proxy_user
  
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 11 for calling the TestWebHDFSHook obj's underlying member method code with example usage: obj.test_init_proxy_user() without return types