code: def test_managed_identity(
      self, mocked_default_azure_credential, mocked_blob_service_client
  ):
      assert mocked_default_azure_credential.called_with(None, None)
      mocked_default_azure_credential.return_value = "foo-bar"
      WasbHook(wasb_conn_id=self.managed_identity_conn_id).get_conn()
      mocked_blob_service_client.assert_called_once_with(
          account_url="https://None.blob.core.windows.net/",
          credential="foo-bar",
          proxies=self.proxies,
      )
  
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 6 for calling the TestWasbHook obj's underlying member method code with example usage: obj.test_managed_identity(mocked_default_azure_credential, mocked_blob_service_client) without return types