code: def test_expand_query(self):
      query = Query(
          prompt="8 5 4 ${x} ${y}",
          settings="",
          environments="x: [1, 2, 3]\ny: [4, 5]",
      )
      assert len(self.service.expand_query(query).requests) == 3 * 2
  
imports: import copy
  import pytest
  import shutil
  import tempfile
  from helm.common.authentication import Authentication
  from helm.common.request import Request
  from helm.proxy.accounts import AuthenticationError, Accounts
  from helm.proxy.query import Query
  from .server_service import ServerService
label_desc: Use image node_id 3 for calling the TestServerService obj's underlying member method code with example usage: obj.test_expand_query() without return types