test_block_gas_refund_eip7778_no_block_reduction()

Documentation for tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_block_2d_gas_accounting.py::test_block_gas_refund_eip7778_no_block_reduction@622620d8.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_block_2d_gas_accounting.py::test_block_gas_refund_eip7778_no_block_reduction --fork Amsterdam

Verify block gas accounting for SSTORE 0→x→0 refund paths.

Execution gas refund via refund_counter does NOT reduce block gas (EIP-7778). State gas refund goes to the reservoir and DOES reduce block_state_gas_used (net zero state growth).

Source code in tests/amsterdam/eip8037_state_creation_gas_cost_increase/test_block_2d_gas_accounting.py

@pytest.mark.valid_from("EIP8037")
def test_block_gas_refund_eip7778_no_block_reduction(
    blockchain_test: BlockchainTestFiller,
    pre: Alloc,
    fork: Fork,
) -> None:
    """
    Verify block gas accounting for SSTORE 0→x→0 refund paths.

    Execution gas refund via `refund_counter` does NOT reduce block gas
    (EIP-7778). State gas refund goes to the reservoir and DOES reduce
    `block_state_gas_used` (net zero state growth).
    """
    sstore_state_gas = Op.SSTORE(new_value=1).state_cost(fork)
    intrinsic_gas = fork.transaction_intrinsic_cost_calculator()()

    num_txs = 3
    # Set then restore: second SSTORE is warm with current_value=1
    code = Op.SSTORE(0, 1) + Op.SSTORE.with_metadata(
        key_warm=True,
        original_value=0,
        current_value=1,
        new_value=0,
    )(0, 0)
    tx_execution = intrinsic_gas + code.execution_cost(fork)
    expected = num_txs * tx_execution
    txs = []
    for _ in range(num_txs):
        contract = pre.deploy_contract(code=code)
        txs.append(
            Transaction(
                to=contract,
                state_gas_reservoir=sstore_state_gas,
                sender=pre.fund_eoa(),
            )
        )

    blockchain_test(
        pre=pre,
        blocks=[
            Block(
                txs=txs,
                header_verify=Header(gas_used=expected),
            )
        ],
        post={},
    )

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.