simplify pre_validate_blocks_multiprocessing() by making it pre-valid…

…ated one block at a time. That's how we use it in production code anyway

chia/_tests/blockchain/blockchain_test_utils.py

@@ -1,14 +1,13 @@
 from __future__ import annotations
 
-import asyncio
 from typing import Optional
 
 from chia_rs import SpendBundleConditions
 
 from chia.consensus.block_body_validation import ForkInfo
 from chia.consensus.blockchain import AddBlockResult, Blockchain
 from chia.consensus.difficulty_adjustment import get_next_sub_slot_iters_and_difficulty
-from chia.consensus.multiprocess_validation import PreValidationResult, pre_validate_blocks_multiprocessing
+from chia.consensus.multiprocess_validation import PreValidationResult, pre_validate_block
 from chia.types.full_block import FullBlock
 from chia.types.validation_state import ValidationState
 from chia.util.augmented_chain import AugmentedBlockchain
@@ -81,17 +80,15 @@ async def _validate_and_add_block(
             conds = SpendBundleConditions([], 0, 0, 0, None, None, [], 0, 0, 0, True)
         results = PreValidationResult(None, uint64(1), conds, uint32(0))
     else:
-        futures = await pre_validate_blocks_multiprocessing(
+        future = await pre_validate_block(
             blockchain.constants,
             AugmentedBlockchain(blockchain),
-            [block],
+            block,
             blockchain.pool,
-            {},
+            None,
             ValidationState(ssi, diff, prev_ses_block),
         )
-        pre_validation_results: list[PreValidationResult] = list(await asyncio.gather(*futures))
-        assert pre_validation_results is not None
-        results = pre_validation_results[0]
+        results = await future
     if results.error is not None:
         if expected_result == AddBlockResult.INVALID_BLOCK and expected_error is None:
             # We expected an error but didn't specify which one