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from pyiceberg.utils.truncate import truncate_upper_bound_binary_string, truncate_upper_bound_text_string


def test_upper_bound_string_truncation() -> None:
    assert truncate_upper_bound_text_string("aaaa", 2) == "ab"
    assert truncate_upper_bound_text_string("".join([chr(0x10FFFF), chr(0x10FFFF), chr(0x0)]), 2) is None


def test_upper_bound_binary_truncation() -> None:
    assert truncate_upper_bound_binary_string(b"\x01\x02\x03", 2) == b"\x01\x03"
    assert truncate_upper_bound_binary_string(b"\xff\xff\x00", 2) is None