test_bal_balance_and_oog()

Documentation for tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_opcodes.py::test_bal_balance_and_oog@892e6d1e.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_opcodes.py::test_bal_balance_and_oog --fork Amsterdam

Ensure BAL handles BALANCE and OOG during BALANCE appropriately.

Source code in tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_opcodes.py

@pytest.mark.parametrize(
    "fails_at_balance",
    [True, False],
    ids=["oog_at_balance", "successful_balance"],
)
def test_bal_balance_and_oog(
    pre: Alloc,
    blockchain_test: BlockchainTestFiller,
    fork: Fork,
    fails_at_balance: bool,
) -> None:
    """Ensure BAL handles BALANCE and OOG during BALANCE appropriately."""
    alice = pre.fund_eoa()
    bob = pre.fund_eoa()

    # Create contract that attempts to check Bob's balance
    balance_checker_code = (
        Op.PUSH20(bob)  # Bob's address
        + Op.BALANCE(address_warm=False)  # Check balance (cold access)
        + Op.STOP
    )

    balance_checker = pre.deploy_contract(code=balance_checker_code)

    intrinsic_gas_cost = fork.transaction_intrinsic_cost_calculator()()

    tx_gas_limit = intrinsic_gas_cost + balance_checker_code.gas_cost(fork)

    if fails_at_balance:
        # subtract 1 gas to ensure OOG at BALANCE
        tx_gas_limit -= 1

    tx = Transaction(
        sender=alice,
        to=balance_checker,
        gas_limit=tx_gas_limit,
    )

    block = Block(
        txs=[tx],
        expected_block_access_list=BlockAccessListExpectation(
            account_expectations={
                balance_checker: BalAccountExpectation.empty(),
                # Bob should only appear in BAL if BALANCE succeeded
                **(
                    {bob: None}
                    if fails_at_balance
                    else {bob: BalAccountExpectation.empty()}
                ),
            }
        ),
    )

    blockchain_test(
        pre=pre,
        blocks=[block],
        post={
            alice: Account(nonce=1),
            bob: Account(),
            balance_checker: Account(),
        },
    )

Parametrized Test Cases

This test generates 2 parametrized test cases across 1 fork.