test_delegation_pointer_new_account_state_gas()

Documentation for tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_delegation_pointer.py::test_delegation_pointer_new_account_state_gas@622620d8.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_delegation_pointer.py::test_delegation_pointer_new_account_state_gas --fork Amsterdam

Test delegation pointer CALL to empty account charges new-account gas.

A contract CALLs with value to a non-existent address. When executed via a delegation pointer, the new-account state gas is charged identically to a direct call.

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

@pytest.mark.valid_from("EIP8037")
def test_delegation_pointer_new_account_state_gas(
    state_test: StateTestFiller,
    pre: Alloc,
    fork: Fork,
) -> None:
    """
    Test delegation pointer CALL to empty account charges new-account gas.

    A contract CALLs with value to a non-existent address. When executed
    via a delegation pointer, the new-account state gas
    is charged identically to a direct call.
    """
    target = pre.nonexistent_account()

    parent_storage = Storage()

    call = Op.CALL(
        gas=0,
        address=target,
        value=1,
        value_transfer=True,
        account_new=True,
    )
    contract_code = Op.SSTORE(parent_storage.store_next(1), call)
    contract = pre.deploy_contract(code=contract_code, balance=1)

    # EOA delegates to the contract
    delegator = pre.fund_eoa(delegation=contract, amount=1)

    # The authorization re-targets an already-delegated authority whose
    # nonce (1, from the delegation setup) no longer matches nonce=0, so
    # it is invalid and charges no top-frame state gas.
    authorization = AuthorizationTuple(
        address=contract,
        nonce=0,
        signer=delegator,
        creates_account=False,
        writes_delegation=False,
        first_write=False,
    )
    intrinsic_execution = fork.transaction_intrinsic_cost_calculator()(
        authorization_list_or_count=[authorization],
        recipient_type=RecipientType.DELEGATION_7702,
        return_cost_deducted_prior_execution=True,
    )
    top_frame_execution = fork.transaction_top_frame_execution_gas(
        recipient_type=RecipientType.DELEGATION_7702,
        delegation_warm=False,
        authorizations=[authorization],
    )
    auth_state_gas = fork.transaction_top_frame_state_gas(
        recipient_type=RecipientType.DELEGATION_7702,
        authorizations=[authorization],
    )
    assert auth_state_gas == 0

    # The callee leaves the value-transfer stipend unused, so it returns
    # to this frame instead of being spent.
    block_execution = (
        intrinsic_execution
        + top_frame_execution
        + contract_code.execution_cost(fork)
        - fork.gas_costs().CALL_STIPEND
    )
    block_state = auth_state_gas + contract_code.state_cost(fork)
    assert block_state > block_execution

    sender = pre.fund_eoa()
    tx = Transaction(
        to=delegator,
        state_gas_reservoir=block_state,
        authorization_list=[authorization],
        sender=sender,
        expected_receipt=TransactionReceipt(
            cumulative_gas_used=block_execution + block_state,
        ),
    )

    # CALL success stored in delegator's storage context
    post = {
        delegator: Account(storage=parent_storage, balance=0),
        target: Account(balance=1),
    }

    state_test(
        pre=pre,
        post=post,
        tx=tx,
        blockchain_test_header_verify=Header(
            gas_used=max(block_execution, block_state)
        ),
    )

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.