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test_bal_balance_changes()

Documentation for tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists.py::test_bal_balance_changes@20373115.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists.py::test_bal_balance_changes --fork Amsterdam

Ensure BAL captures changes to balance.

Source code in tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists.py 
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def test_bal_balance_changes(
    pre: Alloc,
    blockchain_test: BlockchainTestFiller,
    fork: Fork,
) -> None:
    """Ensure BAL captures changes to balance."""
    alice = pre.fund_eoa()
    bob = pre.fund_eoa(amount=0)

    intrinsic_gas_calculator = fork.transaction_intrinsic_cost_calculator()
    intrinsic_gas_cost = intrinsic_gas_calculator(
        calldata=b"",
        contract_creation=False,
        access_list=[],
    )
    tx_gas_limit = intrinsic_gas_cost + 1000  # add a small buffer

    tx = Transaction(
        sender=alice,
        to=bob,
        value=100,
        gas_limit=tx_gas_limit,
        gas_price=1_000_000_000,
    )

    alice_account = pre[alice]
    assert alice_account is not None, "Alice account should exist"
    alice_initial_balance = alice_account.balance

    # Account for both the value sent and gas cost (gas_price * gas_used)
    alice_final_balance = (
        alice_initial_balance - 100 - (intrinsic_gas_cost * 1_000_000_000)
    )

    block = Block(
        txs=[tx],
        expected_block_access_list=BlockAccessListExpectation(
            account_expectations={
                alice: BalAccountExpectation(
                    nonce_changes=[
                        BalNonceChange(block_access_index=1, post_nonce=1)
                    ],
                    balance_changes=[
                        BalBalanceChange(
                            block_access_index=1,
                            post_balance=alice_final_balance,
                        )
                    ],
                ),
                bob: BalAccountExpectation(
                    balance_changes=[
                        BalBalanceChange(
                            block_access_index=1, post_balance=100
                        )
                    ],
                ),
            }
        ),
    )

    blockchain_test(
        pre=pre,
        blocks=[block],
        post={
            alice: Account(nonce=1, balance=alice_final_balance),
            bob: Account(balance=100),
        },
    )

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.