test_sstore_restoration_block_state_gas_zero()

Documentation for tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_sstore.py::test_sstore_restoration_block_state_gas_zero@5c024cbb.

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_block_state_gas_zero --fork Amsterdam

Verify 0 to x to 0 cycles contribute zero to block state gas.

Net state growth is zero. State gas goes directly to state_gas_reservoir rather than refund_counter, so block state gas is not inflated by the charges.

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

@pytest.mark.parametrize(
    "num_cycles",
    [
        pytest.param(1, id="single_cycle"),
        pytest.param(50, id="fifty_cycles"),
    ],
)
@pytest.mark.valid_from("EIP8037")
def test_sstore_restoration_block_state_gas_zero(
    blockchain_test: BlockchainTestFiller,
    pre: Alloc,
    fork: Fork,
    num_cycles: int,
) -> None:
    """
    Verify 0 to x to 0 cycles contribute zero to block state gas.

    Net state growth is zero. State gas goes directly to
    `state_gas_reservoir` rather than `refund_counter`, so block
    state gas is not inflated by the charges.
    """
    sstore_state_gas = Op.SSTORE(new_value=1).state_cost(fork)
    intrinsic_gas = fork.transaction_intrinsic_cost_calculator()()

    code = Bytecode()
    for i in range(num_cycles):
        code += Op.SSTORE(i, 1) + Op.SSTORE.with_metadata(
            key_warm=True,
            original_value=0,
            current_value=1,
            new_value=0,
        )(i, 0)
    tx_regular = (
        intrinsic_gas + code.gas_cost(fork) - num_cycles * sstore_state_gas
    )

    contract = pre.deploy_contract(code=code)
    tx = Transaction(
        to=contract,
        state_gas_reservoir=num_cycles * 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=dict.fromkeys(range(num_cycles), 0))},
    )

Parametrized Test Cases

This test generates 2 parametrized test cases across 1 fork.