code: def test_load_schema_empty(self) -> None:
      self.assertEqual(self.mapper.map_with_type({}, Schema), Schema())
  
imports: from enum import Enum
  from typing import ClassVar, Dict, List, Optional, Union
  from unittest import main, TestCase
  import attr
  from torchbiggraph.schema import Dumper, extract_nested_type, inject_nested_value, Loader, Schema, schema, unpack_optional
label_desc: Use image node_id 4 for calling the TestLoader obj's underlying member method code with example usage: obj.test_load_schema_empty() without return types