test_sstore_restoration_reservoir_spillover()

Documentation for tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_sstore.py::test_sstore_restoration_reservoir_spillover@87aba1a3.

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_reservoir_spillover --fork Amsterdam

Verify restoration refund when state gas spilled into gas_left.

With tx.gas at the cap, reservoir is zero. SSTORE 0 to 1 state gas comes from gas_left. At x to 0 the refund goes to state_gas_reservoir (not back to gas_left), moving gas between buckets. 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_reservoir_spillover(
    blockchain_test: BlockchainTestFiller,
    pre: Alloc,
    fork: Fork,
) -> None:
    """
    Verify restoration refund when state gas spilled into gas_left.

    With tx.gas at the cap, reservoir is zero.  SSTORE 0 to 1 state
    gas comes from gas_left.  At x to 0 the refund goes to
    `state_gas_reservoir` (not back to gas_left), moving gas between
    buckets.  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=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=0,
        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.