code: def test_mapping_raises_with_non_dict(self):
      field = MetadataField(0)
  
      with pytest.raises(TypeError):
          _ = field[0]
  
      with pytest.raises(TypeError):
          _ = len(field)
  
      with pytest.raises(TypeError):
          _ = [x for x in field]
  
file_path: allennlp/tests/data/fields/metadata_field_test.py
imports: import pytest
  from allennlp.common.testing.test_case import AllenNlpTestCase
  from allennlp.data.fields import MetadataField
label_desc: Use image node_id 2 for calling the TestMetadataField obj's underlying member method code with example usage: obj.test_mapping_raises_with_non_dict() without return types