code: def test_no_credentialization_if_unsigned(monkeypatch):
      """Don't get credentials if we're not signing, see #1984"""
      sesh = AWSSession(aws_unsigned=True)
      assert sesh._creds is None
  
imports: from unittest import mock
  import pytest
  from rasterio.session import DummySession, AWSSession, Session, OSSSession, GSSession, SwiftSession, AzureSession, parse_bool
label_desc: Use image node_id 32 for calling a global function with example usage: test_no_credentialization_if_unsigned(monkeypatch) without return types