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test_invalid_non_multiple_excess_blob_gas()

Documentation for tests/cancun/eip4844_blobs/test_excess_blob_gas.py::test_invalid_non_multiple_excess_blob_gas@21fb11c8.

Generate fixtures for these test cases for Prague with:

fill -v tests/cancun/eip4844_blobs/test_excess_blob_gas.py::test_invalid_non_multiple_excess_blob_gas --fork Prague

Test rejection of blocks where the excessBlobGas changes to a value that is not a multiple of Spec.GAS_PER_BLOB`.

  • Parent block contains TARGET_BLOBS_PER_BLOCK + 1 blobs, but excessBlobGas is off by ±1
  • Parent block contains TARGET_BLOBS_PER_BLOCK - 1 blobs, but excessBlobGas is off by ±1
Source code in tests/cancun/eip4844_blobs/test_excess_blob_gas.py 
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@pytest.mark.parametrize_by_fork(
    "parent_blobs,header_excess_blob_gas_delta",
    lambda fork: [
        (fork.target_blobs_per_block() + 1, 1),
        (fork.target_blobs_per_block() + 1, fork.blob_gas_per_blob() - 1),
        (fork.target_blobs_per_block() - 1, -1),
        (fork.target_blobs_per_block() - 1, -(fork.blob_gas_per_blob() - 1)),
    ],
)
@pytest.mark.parametrize("new_blobs", [1])
@pytest.mark.parametrize_by_fork(
    "parent_excess_blobs",
    lambda fork: [fork.target_blobs_per_block() + 1],
)
def test_invalid_non_multiple_excess_blob_gas(
    blockchain_test: BlockchainTestFiller,
    env: Environment,
    pre: Mapping[Address, Account],
    blocks: List[Block],
    correct_excess_blob_gas: int,
    header_excess_blob_gas: Optional[int],
):
    """
    Test rejection of blocks where the `excessBlobGas` changes to a value that
    is not a multiple of Spec.GAS_PER_BLOB`.

    - Parent block contains `TARGET_BLOBS_PER_BLOCK + 1` blobs, but `excessBlobGas` is off by +/-1
    - Parent block contains `TARGET_BLOBS_PER_BLOCK - 1` blobs, but `excessBlobGas` is off by +/-1
    """
    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,
        tag="-".join(
            [
                f"correct:{hex(correct_excess_blob_gas)}",
                f"header:{hex(header_excess_blob_gas)}",
            ]
        ),
    )

Parametrized Test Cases

The interactive table below is also available as a standalone page.

Test ID (Abbreviated) parent_excess_blobs parent_blobs header_excess_blob_gas_delta new_blobs
...fork_Cancun-parent_excess_blobs_4-parent_blobs_4-header_excess_blob_gas_delta_1-blockchain_test-new_blobs_1 4 4 1 1
...fork_Cancun-parent_excess_blobs_4-parent_blobs_4-header_excess_blob_gas_delta_131071-blockchain_test-new_blobs_1 4 4 131071 1
...fork_Cancun-parent_excess_blobs_4-parent_blobs_2-header_excess_blob_gas_delta_-1-blockchain_test-new_blobs_1 4 2 -1 1
...fork_Cancun-parent_excess_blobs_4-parent_blobs_2-header_excess_blob_gas_delta_-131071-blockchain_test-new_blobs_1 4 2 -131071 1
...fork_Prague-parent_excess_blobs_7-parent_blobs_7-header_excess_blob_gas_delta_1-blockchain_test-new_blobs_1 7 7 1 1
...fork_Prague-parent_excess_blobs_7-parent_blobs_7-header_excess_blob_gas_delta_131071-blockchain_test-new_blobs_1 7 7 131071 1
...fork_Prague-parent_excess_blobs_7-parent_blobs_5-header_excess_blob_gas_delta_-1-blockchain_test-new_blobs_1 7 5 -1 1
...fork_Prague-parent_excess_blobs_7-parent_blobs_5-header_excess_blob_gas_delta_-131071-blockchain_test-new_blobs_1 7 5 -131071 1
...fork_Osaka-parent_excess_blobs_7-parent_blobs_7-header_excess_blob_gas_delta_1-blockchain_test-new_blobs_1 7 7 1 1
...fork_Osaka-parent_excess_blobs_7-parent_blobs_7-header_excess_blob_gas_delta_131071-blockchain_test-new_blobs_1 7 7 131071 1
...fork_Osaka-parent_excess_blobs_7-parent_blobs_5-header_excess_blob_gas_delta_-1-blockchain_test-new_blobs_1 7 5 -1 1
...fork_Osaka-parent_excess_blobs_7-parent_blobs_5-header_excess_blob_gas_delta_-131071-blockchain_test-new_blobs_1 7 5 -131071 1