test_sender_is_coinbase()

Documentation for tests/amsterdam/eip2780_reduce_intrinsic_tx_gas/test_warmth_invariants.py::test_sender_is_coinbase@622620d8.

Generate fixtures for these test cases for Amsterdam with:

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

Sender is the block coinbase. The intrinsic charge is unchanged by sender identity, but the priority-fee payment loops back to the sender, so the net gas cost reduces to gas_used * base_fee_per_gas.

The coinbase override is wired via a custom Environment whose fee_recipient matches the sender's address.

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

@EIPChecklist.GasCostChanges.Test.GasUpdatesMeasurement()
@pytest.mark.parametrize(
    "value",
    [
        pytest.param(0, id="zero_value"),
        pytest.param(1, id="non-zero_value"),
    ],
)
def test_sender_is_coinbase(
    fork: Fork,
    pre: Alloc,
    state_test: StateTestFiller,
    value: int,
) -> None:
    """
    Sender is the block coinbase. The intrinsic charge is unchanged
    by sender identity, but the priority-fee payment loops back to
    the sender, so the net gas cost reduces to ``gas_used *
    base_fee_per_gas``.

    The coinbase override is wired via a custom ``Environment`` whose
    ``fee_recipient`` matches the sender's address.
    """
    sender_initial_balance = 10**18
    sender = pre.fund_eoa(sender_initial_balance)

    target_initial_balance = 100
    target = pre.fund_eoa(amount=target_initial_balance)

    intrinsic_gas = fork.transaction_intrinsic_cost_calculator()(
        sends_value=bool(value),
        recipient_type=RecipientType.EOA,
        return_cost_deducted_prior_execution=True,
    )

    base_fee = 7
    gas_price = 1_000_000_000
    gas_limit = intrinsic_gas + 1000
    # Sender pays the full gas fee upfront and is credited the
    # priority fee back as the coinbase: net cost is
    # ``gas_used * base_fee``.
    sender_final_balance = (
        sender_initial_balance - value - intrinsic_gas * base_fee
    )

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

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

    state_test(
        pre=pre,
        tx=tx,
        post=post,
        env=Environment(fee_recipient=sender, base_fee_per_gas=base_fee),
    )

Parametrized Test Cases

This test generates 2 parametrized test cases across 1 fork.