test_non_canonical_single_byte()¶

@pytest.mark.ported_from(
    [
        f"{LEGACY_TX_TESTS}/ttWrongRLP/RLPIncorrectByteEncoding00Copier.json",
        f"{LEGACY_TX_TESTS}/ttWrongRLP/RLPIncorrectByteEncoding01Copier.json",
        f"{LEGACY_TX_TESTS}/ttWrongRLP/RLPIncorrectByteEncoding127Copier.json",
    ],
)
@pytest.mark.exception_test
def test_non_canonical_single_byte(
    transaction_test: TransactionTestFiller,
    pre: Alloc,
    fork: Fork,
) -> None:
    """
    Encode the single-byte nonce payload behind a one-byte string
    header (0x8101) instead of as the byte itself; the non-canonical
    encoding must be rejected.
    """
    fields = signed_tx_fields(pre, fork, nonce=1)
    payload = fields["nonce"]
    assert len(payload) == 1 and payload[0] < 0x80
    rlp = encode_tx(fields, {"nonce": b"\x81" + payload})
    transaction_test(
        pre=pre,
        tx=invalid_tx(
            pre, rlp, TransactionException.RLP_LEADING_ZEROS_NONCE_SIZE
        ),
    )