code: def test_init_with_class(self):
      # This operator uses the OpenSearch client method directly, testing here just
      # confirming that the object is an instance of the class.
      assert isinstance(
          self.open_search_with_doc_class.doc_class, FakeDocument
      )
      assert (
          self.open_search_with_doc_class.task_id
          == "test_opensearch_doc_class_operator"
      )
  
imports: from __future__ import annotations
  import pytest
  from opensearchpy import Document, Keyword, Text
  from airflow.models import DAG
  from airflow.providers.opensearch.operators.opensearch import OpenSearchAddDocumentOperator, OpenSearchCreateIndexOperator, OpenSearchQueryOperator
  from airflow.utils.timezone import datetime
label_desc: Use image node_id 3 for calling the TestOpenSearchAddDocumentOperator obj's underlying member method code with example usage: obj.test_init_with_class() without return types