test_top_frame_charges_delegation_is_coinbase()

Documentation for tests/amsterdam/eip2780_reduce_intrinsic_tx_gas/test_warmth_invariants.py::test_top_frame_charges_delegation_is_coinbase@2119b382.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip2780_reduce_intrinsic_tx_gas/test_warmth_invariants.py::test_top_frame_charges_delegation_is_coinbase --fork Amsterdam

Recipient holds a pre-existing EIP-7702 delegation whose target is the block coinbase. Coinbase is implicitly warm before execution, so the top-frame charges WARM_ACCESS for the delegation target.

Source code in tests/amsterdam/eip2780_reduce_intrinsic_tx_gas/test_warmth_invariants.py

@pytest.mark.parametrize(
    "value",
    [
        pytest.param(0, id="zero_value"),
        pytest.param(1, id="non-zero_value"),
    ],
)
def test_top_frame_charges_delegation_is_coinbase(
    env: Environment,
    fork: Fork,
    pre: Alloc,
    state_test: StateTestFiller,
    value: int,
) -> None:
    """
    Recipient holds a pre-existing EIP-7702 delegation whose target is
    the block coinbase. Coinbase is implicitly warm before execution,
    so the top-frame charges ``WARM_ACCESS`` for the delegation target.
    """
    sender_initial_balance = 10**18
    sender = pre.fund_eoa(sender_initial_balance)

    delegated_to = Address(env.fee_recipient)
    target_code = Spec7702.delegation_designation(delegated_to)
    target = pre.deploy_contract(code=target_code)

    intrinsic_gas = fork.transaction_intrinsic_cost_calculator()(
        sends_value=bool(value),
        recipient_type=RecipientType.DELEGATION_7702,
        return_cost_deducted_prior_execution=True,
    )
    top_frame_gas = fork.transaction_top_frame_gas_calculator()(
        sends_value=bool(value),
        recipient_type=RecipientType.DELEGATION_7702,
        delegation_warm=True,
    )

    total_gas_cost = intrinsic_gas + top_frame_gas
    gas_price = 1_000_000_000
    gas_limit = total_gas_cost + 1000

    tx = Transaction(
        sender=sender,
        to=target,
        value=value,
        gas_limit=gas_limit,
        gas_price=gas_price,
    )

    # Coinbase also receives miner fees, so its post-tx balance is not
    # asserted exactly.
    sender_final_balance = (
        sender_initial_balance - value - total_gas_cost * gas_price
    )

    post = {
        sender: Account(nonce=1, balance=sender_final_balance),
        target: Account(balance=value, code=target_code),
    }

    state_test(pre=pre, tx=tx, post=post)

Parametrized Test Cases

This test generates 2 parametrized test cases across 1 fork.