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test_bal_4788_simple()

Documentation for tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_eip4788.py::test_bal_4788_simple@21507778.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_eip4788.py::test_bal_4788_simple --fork Amsterdam

Ensure BAL captures beacon root storage writes during pre-execution system call.

Block with 2 normal user transactions: Alice sends 10 wei to Charlie, Bob sends 10 wei to Charlie. At block start (pre-execution), SYSTEM_ADDRESS calls BEACON_ROOTS_ADDRESS to store parent beacon root.

Source code in tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_eip4788.py 
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def test_bal_4788_simple(
    pre: Alloc,
    blockchain_test: BlockchainTestFiller,
    fork: Fork,
) -> None:
    """
    Ensure BAL captures beacon root storage writes during pre-execution
    system call.

    Block with 2 normal user transactions: Alice sends 10 wei to Charlie,
    Bob sends 10 wei to Charlie. At block start (pre-execution),
    SYSTEM_ADDRESS calls BEACON_ROOTS_ADDRESS to store parent beacon root.
    """
    alice = pre.fund_eoa()
    bob = pre.fund_eoa()
    charlie = pre.fund_eoa(amount=0)

    block_timestamp = 12
    beacon_root = Hash(0xABCDEF)

    transfer_value = 10

    tx1 = Transaction(
        sender=alice,
        to=charlie,
        value=transfer_value,
        gas_limit=fork.transaction_gas_limit_cap(),
    )

    tx2 = Transaction(
        sender=bob,
        to=charlie,
        value=transfer_value,
        gas_limit=fork.transaction_gas_limit_cap(),
    )

    # Build BAL expectations starting with system call
    account_expectations = beacon_root_system_call_expectations(
        block_timestamp, beacon_root
    )

    # Add transaction-specific expectations
    account_expectations[alice] = BalAccountExpectation(
        nonce_changes=[BalNonceChange(block_access_index=1, post_nonce=1)],
    )
    account_expectations[bob] = BalAccountExpectation(
        nonce_changes=[BalNonceChange(block_access_index=2, post_nonce=1)],
    )
    account_expectations[charlie] = BalAccountExpectation(
        balance_changes=[
            BalBalanceChange(
                block_access_index=1, post_balance=transfer_value
            ),
            BalBalanceChange(
                block_access_index=2, post_balance=transfer_value * 2
            ),
        ],
    )

    block = Block(
        txs=[tx1, tx2],
        parent_beacon_block_root=beacon_root,
        timestamp=block_timestamp,
        expected_block_access_list=BlockAccessListExpectation(
            account_expectations=account_expectations
        ),
    )

    blockchain_test(
        pre=pre,
        blocks=[block],
        post={
            alice: Account(nonce=1),
            bob: Account(nonce=1),
            charlie: Account(balance=transfer_value * 2),
        },
    )

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.