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test_intrinsic_charges_recipient_is_coinbase()

Documentation for tests/amsterdam/eip2780_reduce_intrinsic_tx_gas/test_warmth_invariants.py::test_intrinsic_charges_recipient_is_coinbase@5c024cbb.

Generate fixtures for these test cases for Amsterdam with:

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

Recipient is the block coinbase, which is implicitly warm before transaction execution. The intrinsic charge still includes COLD_ACCOUNT_ACCESS for the recipient.

Source code in tests/amsterdam/eip2780_reduce_intrinsic_tx_gas/test_warmth_invariants.py 
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@pytest.mark.parametrize(
    "value",
    [
        pytest.param(0, id="zero_value"),
        pytest.param(1, id="non-zero_value"),
    ],
)
def test_intrinsic_charges_recipient_is_coinbase(
    env: Environment,
    fork: Fork,
    pre: Alloc,
    state_test: StateTestFiller,
    value: int,
) -> None:
    """
    Recipient is the block coinbase, which is implicitly warm before
    transaction execution. The intrinsic charge still includes
    ``COLD_ACCOUNT_ACCESS`` for the recipient.
    """
    sender_initial_balance = 10**18
    sender = pre.fund_eoa(sender_initial_balance)
    target = Address(env.fee_recipient)
    # Pre-fund coinbase so it is alive at top-frame check time; this
    # isolates the test to the intrinsic charge invariant and avoids
    # the orthogonal ``NEW_ACCOUNT`` top-frame state charge that would
    # otherwise fire for value transfer to an empty recipient.
    pre.fund_address(target, amount=1)

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

    gas_price = 1_000_000_000
    gas_limit = intrinsic_gas + 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; verifying the sender balance is sufficient to
    # pin the intrinsic charge.
    sender_final_balance = (
        sender_initial_balance - value - intrinsic_gas * gas_price
    )

    post = {
        sender: Account(nonce=1, balance=sender_final_balance),
    }

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

Parametrized Test Cases

This test generates 2 parametrized test cases across 1 fork.