test_bal_coinbase_zero_tip()

Documentation for tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists.py::test_bal_coinbase_zero_tip@c74f1a67.

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_coinbase_zero_tip --fork Amsterdam

Ensure BAL includes coinbase even when priority fee is zero.

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

def test_bal_coinbase_zero_tip(
    pre: Alloc,
    blockchain_test: BlockchainTestFiller,
    fork: Fork,
) -> None:
    """Ensure BAL includes coinbase even when priority fee is zero."""
    bob = pre.fund_eoa(amount=0)
    coinbase = pre.fund_eoa(amount=0)  # fee recipient

    intrinsic_gas_calculator = fork.transaction_intrinsic_cost_calculator()
    intrinsic_gas = intrinsic_gas_calculator(
        calldata=b"",
        contract_creation=False,
        access_list=[],
        recipient_type=RecipientType.EMPTY_ACCOUNT,
        sends_value=True,
    )
    top_frame_state_gas = fork.transaction_top_frame_state_gas(
        sends_value=True,
        recipient_type=RecipientType.EMPTY_ACCOUNT,
    )
    tx_gas_limit = intrinsic_gas + top_frame_state_gas + 1000

    # Calculate base fee
    genesis_env = Environment(base_fee_per_gas=0x7)
    base_fee_per_gas = fork.base_fee_per_gas_calculator()(
        parent_base_fee_per_gas=int(genesis_env.base_fee_per_gas or 0),
        parent_gas_used=0,
        parent_gas_limit=genesis_env.gas_limit,
    )

    # Set gas_price equal to base_fee so tip = 0
    tx_value = 5
    alice_initial_balance = (tx_gas_limit * base_fee_per_gas) + tx_value
    alice = pre.fund_eoa(amount=alice_initial_balance)
    tx = Transaction(
        sender=alice,
        to=bob,
        value=tx_value,
        gas_limit=tx_gas_limit,
        gas_price=base_fee_per_gas,
    )

    alice_final_balance = (
        alice_initial_balance
        - tx_value
        - ((intrinsic_gas + top_frame_state_gas) * base_fee_per_gas)
    )

    block = Block(
        txs=[tx],
        fee_recipient=coinbase,
        header_verify=Header(base_fee_per_gas=base_fee_per_gas),
        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=5)
                    ]
                ),
                # Coinbase must be included even with zero tip
                coinbase: BalAccountExpectation.empty(),
            }
        ),
    )

    blockchain_test(
        pre=pre,
        blocks=[block],
        post={
            alice: Account(nonce=1, balance=alice_final_balance),
            bob: Account(balance=5),
        },
        genesis_environment=genesis_env,
    )

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.