test_reserve_price_boundary()

Documentation for tests/osaka/eip7918_blob_reserve_price/test_blob_base_fee.py::test_reserve_price_boundary@e9958ed2.

Generate fixtures for these test cases for Osaka with:

fill -v tests/osaka/eip7918_blob_reserve_price/test_blob_base_fee.py::test_reserve_price_boundary --fork Osaka

Tests the reserve price boundary mechanism. Note the default block base fee per gas is 7 (delta is 0). With a non zero delta the block base fee per gas is set to (boundary * blob base fee) + delta.

Example scenarios from parametrization: Assume parent_excess_blobs = 3: delta=-2: blob_base_fee=1, boundary=8, block_base_fee_per_gas=8+(-2)=6, 6 < 8, reserve inactive, effective_fee=1 delta=0: blob_base_fee=1, boundary=8, block_base_fee_per_gas=7, 7 < 8, reserve inactive, effective_fee=1 delta=100: blob_base_fee=1, boundary=8, block_base_fee_per_gas=8+100=108, 108 > 8, reserve active, effective_fee=max(108/8, 1)=13

All values give a blob base_ fee of 1 because we need a much higher excess blob gas to increase the blob fee. This only increases to 2 at 20 excess blobs.

Source code in tests/osaka/eip7918_blob_reserve_price/test_blob_base_fee.py

@pytest.mark.parametrize_by_fork(
    "parent_excess_blobs",
    # Keep max assuming this will be greater than 20 in the future, to test a
    # blob fee of > 1 :)
    lambda fork: [0, 3, fork.target_blobs_per_block(), fork.max_blobs_per_block()],
)
@pytest.mark.parametrize("block_base_fee_per_gas_delta", [-2, -1, 0, 1, 10, 100])
def test_reserve_price_boundary(
    blockchain_test: BlockchainTestFiller,
    env: Environment,
    pre: Alloc,
    block: Block,
    post: Dict[Address, Account],
) -> None:
    """
    Tests the reserve price boundary mechanism. Note the default block base fee
    per gas is 7 (delta is 0). With a non zero delta the block base fee per gas
    is set to (boundary * blob base fee) + delta.

    Example scenarios from parametrization:
    Assume
      parent_excess_blobs = 3:
      delta=-2:
      blob_base_fee=1,
      boundary=8,
      block_base_fee_per_gas=8+(-2)=6, 6 < 8,
      reserve inactive,
      effective_fee=1 delta=0:
      blob_base_fee=1, boundary=8,
      block_base_fee_per_gas=7, 7 < 8,
      reserve inactive, effective_fee=1
      delta=100: blob_base_fee=1,
      boundary=8, block_base_fee_per_gas=8+100=108, 108 > 8,
      reserve active, effective_fee=max(108/8, 1)=13

    All values give a blob base_ fee of 1 because we need a much higher excess
    blob gas to increase the blob fee. This only increases to 2 at 20 excess
    blobs.
    """
    blockchain_test(
        genesis_environment=env,
        pre=pre,
        blocks=[block],
        post=post,
    )

Parametrized Test Cases

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

Fork All Forks Osaka

Fixture Type All Fixture Types blockchain_test

Test ID (Abbreviated)	parent_excess_blobs	block_base_fee_per_gas_delta
...fork_Osaka-parent_excess_blobs_0-blockchain_test-block_base_fee_per_gas_delta_-2	0	-2
...fork_Osaka-parent_excess_blobs_0-blockchain_test-block_base_fee_per_gas_delta_-1	0	-1
...fork_Osaka-parent_excess_blobs_0-blockchain_test-block_base_fee_per_gas_delta_0	0	0
...fork_Osaka-parent_excess_blobs_0-blockchain_test-block_base_fee_per_gas_delta_1	0	1
...fork_Osaka-parent_excess_blobs_0-blockchain_test-block_base_fee_per_gas_delta_10	0	10
...fork_Osaka-parent_excess_blobs_0-blockchain_test-block_base_fee_per_gas_delta_100	0	100
...fork_Osaka-parent_excess_blobs_3-blockchain_test-block_base_fee_per_gas_delta_-2	3	-2
...fork_Osaka-parent_excess_blobs_3-blockchain_test-block_base_fee_per_gas_delta_-1	3	-1
...fork_Osaka-parent_excess_blobs_3-blockchain_test-block_base_fee_per_gas_delta_0	3	0
...fork_Osaka-parent_excess_blobs_3-blockchain_test-block_base_fee_per_gas_delta_1	3	1
...fork_Osaka-parent_excess_blobs_3-blockchain_test-block_base_fee_per_gas_delta_10	3	10
...fork_Osaka-parent_excess_blobs_3-blockchain_test-block_base_fee_per_gas_delta_100	3	100
...fork_Osaka-parent_excess_blobs_6-blockchain_test-block_base_fee_per_gas_delta_-2	6	-2
...fork_Osaka-parent_excess_blobs_6-blockchain_test-block_base_fee_per_gas_delta_-1	6	-1
...fork_Osaka-parent_excess_blobs_6-blockchain_test-block_base_fee_per_gas_delta_0	6	0
...fork_Osaka-parent_excess_blobs_6-blockchain_test-block_base_fee_per_gas_delta_1	6	1
...fork_Osaka-parent_excess_blobs_6-blockchain_test-block_base_fee_per_gas_delta_10	6	10
...fork_Osaka-parent_excess_blobs_6-blockchain_test-block_base_fee_per_gas_delta_100	6	100
...fork_Osaka-parent_excess_blobs_9-blockchain_test-block_base_fee_per_gas_delta_-2	9	-2
...fork_Osaka-parent_excess_blobs_9-blockchain_test-block_base_fee_per_gas_delta_-1	9	-1
...fork_Osaka-parent_excess_blobs_9-blockchain_test-block_base_fee_per_gas_delta_0	9	0
...fork_Osaka-parent_excess_blobs_9-blockchain_test-block_base_fee_per_gas_delta_1	9	1
...fork_Osaka-parent_excess_blobs_9-blockchain_test-block_base_fee_per_gas_delta_10	9	10
...fork_Osaka-parent_excess_blobs_9-blockchain_test-block_base_fee_per_gas_delta_100	9	100