def test_clean_optional_fields_empty():
"""Verify clean returns None if the values are not required and not set."""
field = DateInputField(required=False)
field.require_all_fields = False
value = field.clean(["", "", ""])
assert value is None
def test_compress_optional_fields_empty():
"""Verify compress returns None if the values are not required and not set."""
field = DateInputField()
field.require_all_fields = False
value = field.compress(["", "", ""])
assert value is None