code: def test_InitializerOrDict():
      # Test metadata matches expected defaults after field creation (null allowed):
      default_initializerordict = get_marshmallow_from_dataclass_field(
          schema_utils.InitializerOrDict()
      )
      assert default_initializerordict.default == "xavier_uniform"
  
      initializerordict = get_marshmallow_from_dataclass_field(
          schema_utils.InitializerOrDict("zeros")
      )
      assert initializerordict.default == "zeros"
  
      # Test default value validation:
      with pytest.raises(MarshmallowValidationError):
          schema_utils.InitializerOrDict("test")
  
      # Test simple schema creation:
      @dataclass
      class CustomTestSchema(schema_utils.BaseMarshmallowConfig):
          foo: Union[None, str, Dict] = schema_utils.InitializerOrDict()
  
      # Test invalid non-dict loads:
      with pytest.raises(MarshmallowValidationError):
          CustomTestSchema.Schema().load({"foo": 1})
  
      with pytest.raises(MarshmallowValidationError):
          CustomTestSchema.Schema().load({"foo": "test"})
  
      # Test valid loads:
      assert CustomTestSchema.Schema().load({}).foo == "xavier_uniform"
      assert (
          CustomTestSchema.Schema().load({"foo": "zeros"}).foo
          == "zeros"
      )
  
      # Test invalid dict loads:
      with pytest.raises(MarshmallowValidationError):
          CustomTestSchema.Schema().load({"foo": None})
      with pytest.raises(MarshmallowValidationError):
          CustomTestSchema.Schema().load({"foo": {"a": "b"}})
      with pytest.raises(MarshmallowValidationError):
          CustomTestSchema.Schema().load({"foo": {"type": "invalid"}})
  
      # Test valid dict loads:
      assert CustomTestSchema.Schema().load(
          {"foo": {"type": "zeros"}}
      ).foo == {"type": "zeros"}
  
file_path: ludwig/tests/ludwig/marshmallow/test_fields_misc.py
imports: from typing import Dict, Tuple, Union
  import pytest
  from marshmallow.exceptions import ValidationError
  from marshmallow_dataclass import dataclass
  from ludwig.config_validation.validation import get_validator, validate
  from ludwig.schema import utils
label_desc: Use image node_id 4 for calling a global function with example usage: test_InitializerOrDict() without return types