test_refund_with_reservoir_state_gas()

Documentation for tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_pricing.py::test_refund_with_reservoir_state_gas@2119b382.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_pricing.py::test_refund_with_reservoir_state_gas --fork Amsterdam

Test refund when state gas is drawn from reservoir.

When state gas comes from the reservoir, the refund still applies. The refund_counter accumulates state + regular gas refunds, and the ⅕ cap uses tx_gas_used_before_refund which accounts for both dimensions. An SSTORE zero-to-nonzero-to-zero sequence should refund correctly.

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

@EIPChecklist.GasRefundsChanges.Test.RefundCalculation()
@pytest.mark.valid_from("EIP8037")
def test_refund_with_reservoir_state_gas(
    state_test: StateTestFiller,
    pre: Alloc,
    fork: Fork,
) -> None:
    """
    Test refund when state gas is drawn from reservoir.

    When state gas comes from the reservoir, the refund still applies.
    The refund_counter accumulates state + regular gas refunds, and
    the 1/5 cap uses tx_gas_used_before_refund which accounts for
    both dimensions. An SSTORE zero-to-nonzero-to-zero sequence
    should refund correctly.
    """
    sstore_state_gas = Op.SSTORE(new_value=1).state_cost(fork)

    contract = pre.deploy_contract(
        code=(Op.SSTORE(0, 1) + Op.SSTORE(0, 0)),
    )

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

    # Slot 0 restored to zero
    post = {contract: Account(storage={0: 0})}
    state_test(pre=pre, post=post, tx=tx)

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.