def METHOD_NAME(self):
    """Test the from_field_names method with a single string parameter."""
    rfl = ReturnFieldList.from_field_names(
        'field1'
    )
    assert isinstance(rfl, ReturnFieldList)
    for rf in rfl:
        assert isinstance(rf, AbstractReturnField)
    rf_names = [rf.name for rf in rfl]
    assert [f for f in ('field1',) if f not in rf_names] == []