code: def test_azure_no_sign_request(monkeypatch):
      """If AZURE_NO_SIGN_REQUEST is set do not default to azure_unsigned=False"""
      monkeypatch.setenv("AZURE_NO_SIGN_REQUEST", "YES")
      assert AzureSession().unsigned
  
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 38 for calling a global function with example usage: test_azure_no_sign_request(monkeypatch) without return types