test_varying_calldata_costs()

Documentation for tests/amsterdam/eip7778_block_gas_accounting_without_refunds/test_gas_accounting.py::test_varying_calldata_costs@9c2813ee.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip7778_block_gas_accounting_without_refunds/test_gas_accounting.py::test_varying_calldata_costs --fork Amsterdam

Test by varying the calldata_floor_cost.

Performs tests for the following 3 scenarios.

1. calldata_floor < tx_gas_after_refund
2. tx_gas_after_refund < calldata_floor < tx_gas_before_refund
3. calldata_floor > tx_gas_before_refund

Source code in tests/amsterdam/eip7778_block_gas_accounting_without_refunds/test_gas_accounting.py

@pytest.mark.parametrize(
    "refund_tx_reverts",
    [
        pytest.param(True, id="refund_tx_reverts"),
        pytest.param(False, id=""),
    ],
)
@pytest.mark.parametrize(
    "calldata_test_type",
    [
        CallDataTestType.DATA_FLOOR_LT_TX_GAS_AFTER_REFUND,
        CallDataTestType.DATA_FLOOR_BETWEEN_TX_GAS_BEFORE_AND_AFTER,
        CallDataTestType.DATA_FLOOR_GT_TX_GAS_BEFORE_REFUND,
    ],
)
@pytest.mark.with_all_refund_types()
@pytest.mark.filter_combinations(
    lambda refund_type, refund_tx_reverts, calldata_test_type, **_: not (
        refund_type == RefundTypes.STORAGE_CLEAR
        and refund_tx_reverts
        and calldata_test_type
        == CallDataTestType.DATA_FLOOR_BETWEEN_TX_GAS_BEFORE_AND_AFTER
    ),
    reason=(
        "STORAGE_CLEAR refund is zero on revert, so the (post, pre) "
        "interval that DATA_FLOOR_BETWEEN needs is empty"
    ),
)
@pytest.mark.valid_from("EIP7778")
def test_varying_calldata_costs(
    blockchain_test: BlockchainTestFiller,
    pre: Alloc,
    fork: Fork,
    refund_type: RefundTypes,
    refund_tx_reverts: bool,
    calldata_test_type: CallDataTestType,
) -> None:
    """
    Test by varying the calldata_floor_cost.

    Performs tests for the following 3 scenarios.

    1. calldata_floor < tx_gas_after_refund
    2. tx_gas_after_refund < calldata_floor < tx_gas_before_refund
    3. calldata_floor > tx_gas_before_refund
    """
    match refund_type:
        case RefundTypes.STORAGE_CLEAR:
            bytes_to_add_per_iteration = b"00" * 2
        case RefundTypes.AUTHORIZATION_EXISTING_AUTHORITY:
            bytes_to_add_per_iteration = b"00" * 10
        case _:
            raise ValueError(
                f"Unknown refund type: {refund_type} (Test needs update)"
            )

    data = b""

    # Time to start searching for appropriate call data for each scenario
    num_iterations = 200
    # Currently in EIP-7778, the optimal call data is found in about
    # 30 iterations for CallDataTestType.DATA_FLOOR_GT_TX_GAS_BEFORE_REFUND.
    # Setting this higher just to make it
    # a bit more future proof if the gas calc logic changes
    found_call_data = False
    for _ in range(num_iterations):
        post = Alloc()

        (
            gas_used_post_refund,
            gas_used_pre_refund,
            call_data_floor_cost,
            refund_tx,
        ) = build_refund_tx(
            fork=fork,
            pre=pre,
            post=post,
            refund_types={refund_type},
            refund_tx_reverts=refund_tx_reverts,
            call_data=data,
        )

        if (
            calldata_test_type
            == CallDataTestType.DATA_FLOOR_LT_TX_GAS_AFTER_REFUND
        ):
            if call_data_floor_cost < gas_used_post_refund:
                found_call_data = True
                break
        elif (
            calldata_test_type
            == CallDataTestType.DATA_FLOOR_BETWEEN_TX_GAS_BEFORE_AND_AFTER
        ):
            if (
                gas_used_post_refund
                < call_data_floor_cost
                < gas_used_pre_refund
            ):
                found_call_data = True
                break
        elif (
            calldata_test_type
            == CallDataTestType.DATA_FLOOR_GT_TX_GAS_BEFORE_REFUND
        ):
            if gas_used_pre_refund < call_data_floor_cost:
                found_call_data = True
                break
        else:
            raise ValueError("Invalid calldata test type")

        data += bytes_to_add_per_iteration

    if not found_call_data:
        raise ValueError(
            f"Could not find the call_data with {num_iterations} iterations."
        )

    refund_tx_block_gas_used = max(call_data_floor_cost, gas_used_pre_refund)

    blockchain_test(
        pre=pre,
        blocks=[
            Block(
                txs=[refund_tx],
                expected_gas_used=refund_tx_block_gas_used,
            )
        ],
        post=post,
    )

Parametrized Test Cases

This test generates 11 parametrized test cases across 1 fork.