code: def test_existing_roles(self):
      assert EXISTING_ROLES == {
          "Admin",
          "Viewer",
          "User",
          "Op",
          "Public",
      }
  
imports: from __future__ import annotations
  from airflow.providers.fab.auth_manager.security_manager.constants import EXISTING_ROLES
label_desc: Use image node_id 1 for calling the TestFbSecurityManagerConstants obj's underlying member method code with example usage: obj.test_existing_roles() without return types