fix: BAL as object in fixture block so RLP is correct

Author: fselmo

src/ethereum_test_fixtures/blockchain.py

@@ -443,8 +443,8 @@ class FixtureBlockBase(CamelModel):
     ommers: List[FixtureHeader] = Field(default_factory=list, alias="uncleHeaders")
     withdrawals: List[FixtureWithdrawal] | None = None
     execution_witness: WitnessChunk | None = None
-    block_access_list: Bytes | None = Field(
-        None, description="Serialized EIP-7928 Block Access List"
+    block_access_list: BlockAccessList | None = Field(
+        None, description="EIP-7928 Block Access List"
     )
 
     @computed_field(alias="blocknumber")  # type: ignore[misc]
@@ -464,6 +464,9 @@ def with_rlp(self, txs: List[Transaction]) -> "FixtureBlock":
         if self.withdrawals is not None:
             block.append([w.to_serializable_list() for w in self.withdrawals])
 
+        if self.block_access_list is not None:
+            block.append(self.block_access_list.to_list())
+
         return FixtureBlock(
             **self.model_dump(),
             rlp=eth_rlp.encode(block),

src/ethereum_test_specs/blockchain.py

@@ -338,7 +338,7 @@ def get_fixture_block(self) -> FixtureBlock | InvalidFixtureBlock:
                 if self.withdrawals is not None
                 else None
             ),
-            block_access_list=self.block_access_list.rlp if self.block_access_list else None,
+            block_access_list=self.block_access_list if self.block_access_list else None,
             fork=self.fork,
         ).with_rlp(txs=self.txs)
 
@@ -367,9 +367,9 @@ def get_fixture_engine_new_payload(self) -> FixtureEngineNewPayload:
             transactions=self.txs,
             withdrawals=self.withdrawals,
             requests=self.requests,
+            block_access_list=self.block_access_list.rlp,
             validation_error=self.expected_exception,
             error_code=self.engine_api_error_code,
-            block_access_list=self.block_access_list.rlp if self.block_access_list else None,
         )
 
     def verify_transactions(self, transition_tool_exceptions_reliable: bool) -> List[int]: