test_bal_7702_null_address_delegation_no_code_change()

Documentation for tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_eip7702.py::test_bal_7702_null_address_delegation_no_code_change@c74f1a67.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_eip7702.py::test_bal_7702_null_address_delegation_no_code_change --fork Amsterdam

Ensure BAL does not record spurious code changes when delegating to NULL_ADDRESS (sets code to empty on an account that already has empty code).

Source code in tests/amsterdam/eip7928_block_level_access_lists/test_block_access_lists_eip7702.py

def test_bal_7702_null_address_delegation_no_code_change(
    pre: Alloc,
    blockchain_test: BlockchainTestFiller,
) -> None:
    """
    Ensure BAL does not record spurious code changes when delegating to
    NULL_ADDRESS (sets code to empty on an account that already has
    empty code).
    """
    alice = pre.fund_eoa()
    bob = pre.fund_eoa(amount=0)

    tx = Transaction(
        sender=alice,
        to=bob,
        value=10,
        authorization_list=[
            AuthorizationTuple(
                address=0,
                nonce=1,
                signer=alice,
            )
        ],
    )

    # `alice` should appear in BAL with nonce change only, NOT code change
    # because setting code from b"" to b"" is a net-zero change
    account_expectations = {
        alice: BalAccountExpectation(
            nonce_changes=[BalNonceChange(block_access_index=1, post_nonce=2)],
            code_changes=[],  # explicit check for no code changes
        ),
        bob: BalAccountExpectation(
            balance_changes=[
                BalBalanceChange(block_access_index=1, post_balance=10)
            ]
        ),
    }

    blockchain_test(
        pre=pre,
        blocks=[
            Block(
                txs=[tx],
                expected_block_access_list=BlockAccessListExpectation(
                    account_expectations=account_expectations
                ),
            )
        ],
        post={
            alice: Account(nonce=2, code=b""),
            bob: Account(balance=10),
        },
    )

Parametrized Test Cases

This test generates 1 parametrized test case across 1 fork.