test_existing_account_no_refund()

Documentation for tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_set_code.py::test_existing_account_no_refund@26332146.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_state_gas_set_code.py::test_existing_account_no_refund --fork Amsterdam

An existing-authority delegation is charged the reduced top-frame cost directly, with no refund.

The authority is an existing funded EOA gaining a fresh delegation. Its leaf exists, so set_delegation charges neither NEW_ACCOUNT nor ACCOUNT_WRITE (and, unlike the superseded EIP-8037 behaviour, refunds neither); it charges only the top-frame AUTH_BASE. The receipt gas is therefore exactly the execution intrinsic plus AUTH_BASE.

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

@pytest.mark.valid_from("EIP8037")
def test_existing_account_no_refund(
    state_test: StateTestFiller,
    pre: Alloc,
    fork: Fork,
) -> None:
    """
    An existing-authority delegation is charged the reduced top-frame
    cost directly, with no refund.

    The authority is an existing funded EOA gaining a fresh delegation.
    Its leaf exists, so ``set_delegation`` charges neither ``NEW_ACCOUNT``
    nor ``ACCOUNT_WRITE`` (and, unlike the superseded EIP-8037 behaviour,
    refunds neither); it charges only the top-frame ``AUTH_BASE``. The
    receipt gas is therefore exactly the execution intrinsic plus
    ``AUTH_BASE``.
    """
    contract = pre.deploy_contract(code=Op.STOP)

    signer = pre.fund_eoa()
    authorization_list = [
        AuthorizationTuple(
            address=contract,
            nonce=0,
            signer=signer,
            creates_account=False,
            writes_delegation=True,
        ),
    ]

    intrinsic_execution, top_frame_execution, top_frame_state = _auth_gas(
        fork, authorization_list
    )
    cumulative_gas_used, header_gas_used = _receipt_and_header(
        intrinsic_execution, top_frame_execution, top_frame_state
    )

    tx = Transaction(
        to=contract,
        authorization_list=authorization_list,
        sender=pre.fund_eoa(),
        expected_receipt=TransactionReceipt(
            cumulative_gas_used=cumulative_gas_used,
        ),
    )

    post = {signer: Account(code=Spec7702.delegation_designation(contract))}
    state_test(
        pre=pre,
        post=post,
        tx=tx,
        blockchain_test_header_verify=Header(gas_used=header_gas_used),
    )

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.