test_bal_invalid_extraneous_coinbase()

Documentation for tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_invalid.py::test_bal_invalid_extraneous_coinbase@622620d8.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_invalid.py::test_bal_invalid_extraneous_coinbase --fork Amsterdam

Test that clients reject blocks where BAL contains a spurious coinbase entry when the coinbase received no fees.

Coinbase is only included in BAL when it receives transaction tips. In blocks with no transactions, the coinbase receives nothing — even if withdrawals modify other accounts' balances.

• empty_block: No txs, no withdrawals. Only system contracts.
• withdrawal_only: No txs, one withdrawal to a different address. Withdrawals don't pay fees, so coinbase is still untouched.

Source code in tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_invalid.py

@pytest.mark.valid_from("Amsterdam")
@pytest.mark.exception_test
@pytest.mark.parametrize(
    "has_withdrawal",
    [
        pytest.param(False, id="empty_block"),
        pytest.param(True, id="withdrawal_only"),
    ],
)
def test_bal_invalid_extraneous_coinbase(
    blockchain_test: BlockchainTestFiller,
    pre: Alloc,
    has_withdrawal: bool,
) -> None:
    """
    Test that clients reject blocks where BAL contains a spurious
    coinbase entry when the coinbase received no fees.

    Coinbase is only included in BAL when it receives transaction tips.
    In blocks with no transactions, the coinbase receives nothing —
    even if withdrawals modify other accounts' balances.

    - empty_block: No txs, no withdrawals. Only system contracts.
    - withdrawal_only: No txs, one withdrawal to a different address.
      Withdrawals don't pay fees, so coinbase is still untouched.
    """
    coinbase = pre.fund_eoa(amount=0)

    withdrawals = None
    post: dict = {}
    if has_withdrawal:
        recipient = pre.fund_eoa(amount=0)
        withdrawals = [
            Withdrawal(
                index=0,
                validator_index=0,
                address=recipient,
                amount=10,
            )
        ]
        post[recipient] = None

    blockchain_test(
        pre=pre,
        post=post,
        blocks=[
            Block(
                txs=[],
                fee_recipient=coinbase,
                withdrawals=withdrawals,
                exception=BlockException.INVALID_BLOCK_ACCESS_LIST,
                expected_block_access_list=BlockAccessListExpectation(
                    account_expectations={coinbase: None}
                ).modify(
                    append_account(BalAccountChange(address=coinbase)),
                    sort_accounts_by_address(),
                ),
            )
        ],
    )

Parametrized Test Cases

This test generates 2 parametrized test cases across 1 fork.