code: def test_as_raises_error_when_field_is_empty(self) -> None:
      with pytest.raises(
          AssetCardError,
          match=r"^The value of the field 'field4' of the asset card 'test-card' must not be empty\.$",
      ):
          self.card.field("field4").as_(str)
  
      with pytest.raises(
          AssetCardError,
          match=r"^The value of the field 'field5' of the asset card 'test-card' must not be empty\.$",
      ):
          self.card.field("field5").as_list(str)
  
imports: from os import PathLike
  from pathlib import Path
  import pytest
  from fairseq2.assets import AssetCard, AssetCardError, AssetCardFieldNotFoundError
label_desc: Use image node_id 7 for calling the TestAssetCard obj's underlying member method code with example usage: obj.test_as_raises_error_when_field_is_empty() without return types