test_sstore_restoration_intermediate_values()

Documentation for tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_sstore.py::test_sstore_restoration_intermediate_values@c74f1a67.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_sstore.py::test_sstore_restoration_intermediate_values --fork Amsterdam

Verify restoration refund triggers for 0 to x to y to 0.

The refund condition is original_value == new_value == 0, independent of intermediate values. One state gas charge at the first 0 to x; no charge for nonzero-to-nonzero; refund to reservoir at y to 0. Net block state gas is zero.

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

@pytest.mark.valid_from("EIP8037")
def test_sstore_restoration_intermediate_values(
    blockchain_test: BlockchainTestFiller,
    pre: Alloc,
    fork: Fork,
) -> None:
    """
    Verify restoration refund triggers for 0 to x to y to 0.

    The refund condition is `original_value == new_value == 0`,
    independent of intermediate values. One state gas charge at the
    first 0 to x; no charge for nonzero-to-nonzero; refund to reservoir
    at y to 0.  Net block state gas is zero.
    """
    sstore_state_gas = Op.SSTORE(new_value=1).state_cost(fork)
    intrinsic_gas = fork.transaction_intrinsic_cost_calculator()()

    code = (
        Op.SSTORE(0, 1)
        + Op.SSTORE.with_metadata(
            key_warm=True,
            original_value=0,
            current_value=1,
            new_value=2,
        )(0, 2)
        + Op.SSTORE.with_metadata(
            key_warm=True,
            original_value=0,
            current_value=2,
            new_value=0,
        )(0, 0)
    )
    tx_regular = intrinsic_gas + code.gas_cost(fork) - sstore_state_gas

    contract = pre.deploy_contract(code=code)
    tx = Transaction(
        to=contract,
        state_gas_reservoir=sstore_state_gas,
        sender=pre.fund_eoa(),
    )

    blockchain_test(
        pre=pre,
        blocks=[Block(txs=[tx], header_verify=Header(gas_used=tx_regular))],
        post={contract: Account(storage={0: 0})},
    )

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.