code: def test_load_string(self, mock_upload, create_container):
      hook = WasbHook(wasb_conn_id=self.azure_shared_key_test)
      hook.load_string(
          "big string",
          "container",
          "blob",
          create_container,
          max_connections=1,
      )
      mock_upload.assert_called_once_with(
          container_name="container",
          blob_name="blob",
          data="big string",
          create_container=create_container,
          max_connections=1,
      )
  
imports: from __future__ import annotations
  from unittest import mock
  import pytest
  from azure.core.exceptions import ResourceNotFoundError
  from azure.storage.blob import BlobServiceClient
  from azure.storage.blob._models import BlobProperties
  from airflow.exceptions import AirflowException
  from airflow.models import Connection
  from airflow.providers.microsoft.azure.hooks.wasb import WasbHook
label_desc: Use image node_id 23 for calling the TestWasbHook obj's underlying member method code with example usage: obj.test_load_string(mock_upload, create_container) without return types