def test_dynamodb_field_to_native_should_rasie_invalid_json():
    field = MapType()
    with pytest.raises(ConversionError):
        assert field.to_native('{"field": None}')
def test_dynamodb_field_to_native_should_rasie_invalid_json():
    field = MapType()
    with pytest.raises(ConversionError):
        assert field.to_native('{"field": None}')
def test_dynamodb_field_to_native_should_parse_valid_json():
    field = MapType()
    assert field.to_native('{"field": "value"}') == {'field': 'value'}
def test_dynamodb_field_to_native_should_parse_valid_json():
    field = MapType()
    assert field.to_native('{"field": "value"}') == {'field': 'value'}