test_create_tx_collision_refunds_reservoir()

Documentation for tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_create.py::test_create_tx_collision_refunds_reservoir@5c024cbb.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_create.py::test_create_tx_collision_refunds_reservoir --fork Amsterdam

Verify the state-gas reservoir is refunded on a depth-0 CREATE-tx address collision when gas_limit > TX_MAX_GAS_LIMIT.

EIP-8037 splits gas_limit into the capped regular budget and a state-gas reservoir. On collision the inner regular gas is burnt and intrinsic_state_gas is refunded; the reservoir must also be refunded to the sender. header.gas_used is fixed at the regular cap regardless of reservoir handling, so the sender's post-balance is the primary discriminating assertion.

Source code in tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_create.py

@pytest.mark.pre_alloc_mutable()
@pytest.mark.execute(pytest.mark.skip(reason="Requires specific gas price"))
@pytest.mark.valid_from("EIP8037")
def test_create_tx_collision_refunds_reservoir(
    blockchain_test: BlockchainTestFiller,
    pre: Alloc,
    fork: Fork,
) -> None:
    """
    Verify the state-gas reservoir is refunded on a depth-0 CREATE-tx
    address collision when `gas_limit > TX_MAX_GAS_LIMIT`.

    EIP-8037 splits `gas_limit` into the capped regular budget and a
    state-gas reservoir. On collision the inner regular gas is burnt
    and `intrinsic_state_gas` is refunded; the reservoir must also
    be refunded to the sender. `header.gas_used` is fixed at the
    regular cap regardless of reservoir handling, so the sender's
    post-balance is the primary discriminating assertion.
    """
    gas_limit_cap = fork.transaction_gas_limit_cap()
    assert gas_limit_cap is not None

    init_code = Op.STOP
    # +1 above intrinsic_state_gas (= create_state_gas(code_size=0)
    # for empty-code CREATE-tx) makes message.state_gas_reservoir > 0.
    reservoir = fork.create_state_gas(code_size=0) + 1
    gas_limit = gas_limit_cap + reservoir
    initial_fund = 10**18

    sender = pre.fund_eoa(initial_fund)
    collision_target = compute_create_address(address=sender, nonce=0)
    pre[collision_target] = Account(nonce=1)

    tx_gas_price = 7
    tx = Transaction(
        to=None,
        data=init_code,
        gas_limit=gas_limit,
        sender=sender,
        gas_price=tx_gas_price,
    )

    blockchain_test(
        pre=pre,
        blocks=[
            Block(
                txs=[tx],
                header_verify=Header(gas_used=gas_limit_cap),
            ),
        ],
        post={
            sender: Account(
                balance=initial_fund - gas_limit_cap * tx_gas_price,
                nonce=1,
            ),
            collision_target: Account(nonce=1, code=b"", storage={}),
        },
    )

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.