test_create_collision_no_log()

Documentation for tests/amsterdam/eip7708_eth_transfer_logs/test_transfer_logs.py::test_create_collision_no_log@c74f1a67.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/amsterdam/eip7708_eth_transfer_logs/test_transfer_logs.py::test_create_collision_no_log --fork Amsterdam

Test that CREATE/CREATE2 collision does not emit transfer log.

When CREATE fails because target address already has code/nonce, no value transfer occurs and no log should be emitted.

Source code in tests/amsterdam/eip7708_eth_transfer_logs/test_transfer_logs.py

@pytest.mark.pre_alloc_mutable
@pytest.mark.with_all_create_opcodes
def test_create_collision_no_log(
    state_test: StateTestFiller,
    env: Environment,
    pre: Alloc,
    sender: EOA,
    create_opcode: Op,
) -> None:
    """
    Test that CREATE/CREATE2 collision does not emit transfer log.

    When CREATE fails because target address already has code/nonce,
    no value transfer occurs and no log should be emitted.
    """
    initcode = Op.RETURN(0, 0)
    initcode_bytes = bytes(initcode)
    initcode_len = len(initcode_bytes)

    # Deploy factory first to compute created address
    if create_opcode == Op.CREATE:
        factory_code = Op.MSTORE(
            0, Op.PUSH32(initcode_bytes.rjust(32, b"\x00"))
        ) + Op.CREATE(value=1, offset=32 - initcode_len, size=initcode_len)
    else:
        factory_code = Op.MSTORE(
            0, Op.PUSH32(initcode_bytes.rjust(32, b"\x00"))
        ) + Op.CREATE2(
            value=1, offset=32 - initcode_len, size=initcode_len, salt=0
        )

    factory = pre.deploy_contract(factory_code, balance=1)

    # Compute and pre-populate the collision address
    if create_opcode == Op.CREATE:
        collision_address = compute_create_address(address=factory, nonce=1)
    else:
        collision_address = compute_create2_address(
            address=factory, salt=0, initcode=initcode_bytes
        )

    # Pre-deploy contract at collision address to cause collision
    pre.deploy_contract(Op.STOP, address=collision_address)

    tx = Transaction(
        sender=sender,
        to=factory,
        value=0,
        expected_receipt=TransactionReceipt(
            logs=[]
        ),  # No logs - CREATE failed
    )

    state_test(env=env, pre=pre, post={}, tx=tx)

Parametrized Test Cases

This test generates 2 parametrized test cases across 1 fork.