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test_extcodehash_empty_send_value()

Documentation for tests/constantinople/eip1052_extcodehash/test_extcodehash.py::test_extcodehash_empty_send_value@ffe48572.

Generate fixtures for these test cases for Bogota with:

fill -v tests/constantinople/eip1052_extcodehash/test_extcodehash.py::test_extcodehash_empty_send_value --fork Bogota

Test EXTCODEHASH of non-existent account before and after sending value.

Verify that EXTCODEHASH transitions from 0 to keccak256("") when the account receives value within the same transaction.

Source code in tests/constantinople/eip1052_extcodehash/test_extcodehash.py 
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@pytest.mark.ported_from(
    [
        "https://github.com/ethereum/tests/blob/v13.3/src/GeneralStateTestsFiller/stExtCodeHash/extcodehashEmpty_ParisFiller.yml",  # noqa: E501
    ],
    pr=["https://github.com/ethereum/execution-specs/pull/2237"],
)
def test_extcodehash_empty_send_value(
    state_test: StateTestFiller,
    pre: Alloc,
) -> None:
    """
    Test EXTCODEHASH of non-existent account before and after sending value.

    Verify that EXTCODEHASH transitions from 0 to keccak256("") when
    the account receives value within the same transaction.
    """
    storage = Storage()
    target_address = pre.nonexistent_account()

    code = (
        # EXTCODEHASH before sending value: expect 0 (non-existent).
        Op.SSTORE(
            storage.store_next(0),
            Op.EXTCODEHASH(target_address),
        )
        # Send 1 wei to target, creating the account.
        + Op.CALL(gas=Op.GAS, address=target_address, value=1)
        # EXTCODEHASH after sending value: expect keccak256("").
        + Op.SSTORE(
            storage.store_next(keccak256(b"")),
            Op.EXTCODEHASH(target_address),
        )
    )

    code_address = pre.deploy_contract(
        code, balance=10**18, storage=storage.canary()
    )

    tx = Transaction(sender=pre.fund_eoa(), to=code_address)

    state_test(
        pre=pre,
        post={
            code_address: Account(storage=storage),
        },
        tx=tx,
    )

Parametrized Test Cases

This test generates 1 parametrized test case across 11 forks.