test_invalid_excess_blob_gas_change()

Documentation for tests/cancun/eip4844_blobs/test_excess_blob_gas.py::test_invalid_excess_blob_gas_change@2867859a.

Generate fixtures for these test cases for Amsterdam with:

fill -v tests/cancun/eip4844_blobs/test_excess_blob_gas.py::test_invalid_excess_blob_gas_change --fork Amsterdam

Test rejection of blocks where the excessBlobGas changes to an invalid value.

Given a parent block containing [0, MAX_BLOBS_PER_BLOCK] blobs, test an invalid excessBlobGas value by changing it by [-TARGET_BLOBS_PER_BLOCK, TARGET_BLOBS_PER_BLOCK] from the correct value.

Source code in tests/cancun/eip4844_blobs/test_excess_blob_gas.py

@pytest.mark.parametrize_by_fork(
    "parent_blobs,header_excess_blobs_delta",
    lambda fork: itertools.product(
        # parent_blobs
        range(0, fork.max_blobs_per_block() + 1),
        # header_excess_blobs_delta (from correct value)
        [
            x
            for x in range(
                -fork.target_blobs_per_block(),
                fork.target_blobs_per_block() + 1,
            )
            if x != 0
        ],
    ),
)
@pytest.mark.parametrize("new_blobs", [1])
@pytest.mark.exception_test
def test_invalid_excess_blob_gas_change(
    blockchain_test: BlockchainTestFiller,
    env: Environment,
    pre: Mapping[Address, Account],
    blocks: List[Block],
    correct_excess_blob_gas: int,
    header_excess_blob_gas: Optional[int],
) -> None:
    """
    Test rejection of blocks where the `excessBlobGas` changes to an invalid
    value.

    Given a parent block containing `[0, MAX_BLOBS_PER_BLOCK]` blobs, test an
    invalid `excessBlobGas` value by changing it by `[-TARGET_BLOBS_PER_BLOCK,
    TARGET_BLOBS_PER_BLOCK]` from the correct value.
    """
    if header_excess_blob_gas is None:
        raise Exception("test case is badly formatted")

    if header_excess_blob_gas == correct_excess_blob_gas:
        raise Exception("invalid test case")

    blockchain_test(
        pre=pre,
        post={},
        blocks=blocks,
        genesis_environment=env,
    )

Parametrized Test Cases

This test generates 616 parametrized test cases across 4 forks.