test_selfdestruct_pre_existing_account_no_refund()

Documentation for tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_selfdestruct.py::test_selfdestruct_pre_existing_account_no_refund@a9abd46e.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_selfdestruct.py::test_selfdestruct_pre_existing_account_no_refund --fork Amsterdam

Verify SELFDESTRUCT of a pre-existing account earns no refund.

The same-tx-create guard (address in tx_state.created_accounts) is load-bearing: without it, destroying any account would leak state gas back into the reservoir. A contract deployed in pre is destroyed by the tx; accounts_to_delete contains it but created_accounts does not, so no refund is applied. The block header gas_used reflects the full regular-gas tx cost (no state-gas refund offset).

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

@pytest.mark.valid_from("EIP8037")
def test_selfdestruct_pre_existing_account_no_refund(
    blockchain_test: BlockchainTestFiller,
    pre: Alloc,
    fork: Fork,
) -> None:
    """
    Verify SELFDESTRUCT of a pre-existing account earns no refund.

    The same-tx-create guard (`address in tx_state.created_accounts`)
    is load-bearing: without it, destroying any account would leak
    state gas back into the reservoir.  A contract deployed in `pre`
    is destroyed by the tx; `accounts_to_delete` contains it but
    `created_accounts` does not, so no refund is applied.  The block
    header `gas_used` reflects the full regular-gas tx cost (no
    state-gas refund offset).
    """
    intrinsic_gas = fork.transaction_intrinsic_cost_calculator()()

    # Victim deployed in `pre` (NOT same-tx-created).  SELFDESTRUCTs
    # to self so no new-account state gas is charged to the tx.
    victim_code = Op.SELFDESTRUCT.with_metadata(address_warm=True)(Op.ADDRESS)
    victim = pre.deploy_contract(code=victim_code)

    caller_code = Op.POP(Op.CALL(gas=Op.GAS, address=victim))
    caller = pre.deploy_contract(code=caller_code)

    # No refund offset: both caller_code and victim_code are pure
    # regular gas (SELFDESTRUCT to self, no value-to-new-account).
    tx_regular = (
        intrinsic_gas + caller_code.gas_cost(fork) + victim_code.gas_cost(fork)
    )

    tx = Transaction(
        to=caller,
        state_gas_reservoir=0,
        sender=pre.fund_eoa(),
    )

    # Per EIP-6780, SELFDESTRUCT on a not-same-tx-created account
    # does not delete it — the account still exists after the tx.
    blockchain_test(
        pre=pre,
        blocks=[Block(txs=[tx], header_verify=Header(gas_used=tx_regular))],
        post={victim: Account(code=victim_code)},
    )

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.