code: def test_aws_session_class_unsigned():
      """AWSSession works"""
      pytest.importorskip("boto3")
      sesh = AWSSession(aws_unsigned=True, region_name="us-mountain-1")
      assert (
          sesh.get_credential_options()["AWS_NO_SIGN_REQUEST"] == "YES"
      )
      assert (
          sesh.get_credential_options()["AWS_REGION"] == "us-mountain-1"
      )
  
imports: from unittest import mock
  import pytest
  from fiona.session import DummySession, AWSSession, Session, OSSSession, GSSession, SwiftSession, AzureSession
label_desc: Use image node_id 6 for calling a global function with example usage: test_aws_session_class_unsigned() without return types