code: def test_custom_auth_header():
      config = {
          "url": url,
          "custom_auth_header": custom_auth_header,
          "password": password,
      }
      fs = WebDAVFileSystem(**config)
      assert issubset(
          {"headers": {custom_auth_header: password}, "auth": None},
          fs.fs_args,
      )
  
file_path: dvc/tests/unit/remote/test_webdav.py
imports: import pytest
  from dvc_webdav import WebDAVFileSystem, WebDAVSFileSystem
  from dvc.fs import get_cloud_fs
  from tests.utils.asserts import issubset
label_desc: Use image node_id 6 for calling a global function with example usage: test_custom_auth_header() without return types