fix(test-fixtures): emit chainId in state test fixture transaction (#3125)

Author: spencer-tb

docs/running_tests/test_formats/state_test.md

@@ -108,6 +108,10 @@ Excess blob gas of the block where the transaction is executed.
 
 ### `FixtureTransaction`
 
+#### - `chainId`: [`ZeroPaddedHexNumber`](./common_types.md#zeropaddedhexnumber)
+
+Chain id of the transaction; omitted for unprotected (non-EIP-155) type-0 transactions
+
 #### - `nonce`: [`ZeroPaddedHexNumber`](./common_types.md#zeropaddedhexnumber)
 
 Nonce of the account that sends the transaction

packages/testing/src/execution_testing/fixtures/state.py

@@ -46,6 +46,7 @@ class FixtureTransaction(TransactionFixtureConverter):
     # via model_dump(), which includes many fields not in this model.
     model_config = CamelModel.model_config | {"extra": "ignore"}
 
+    chain_id: ZeroPaddedHexNumber | None = None
     nonce: ZeroPaddedHexNumber
     gas_price: ZeroPaddedHexNumber | None = None
     max_priority_fee_per_gas: ZeroPaddedHexNumber | None = None
@@ -69,6 +70,9 @@ def from_transaction(cls, tx: Transaction) -> "FixtureTransaction":
             exclude={"gas_limit", "value", "data", "access_list"},
             exclude_none=True,
         )
+        if tx.ty == 0 and not tx.protected:
+            # Unprotected legacy transactions encode no chain id.
+            model_as_dict.pop("chain_id", None)
         model_as_dict["gas_limit"] = [tx.gas_limit]
         model_as_dict["value"] = [tx.value]
         model_as_dict["data"] = [tx.data]

packages/testing/src/execution_testing/specs/tests/fixtures/chainid_cancun_state_test_tx_type_1.json

@@ -1,7 +1,7 @@
 {
     "000/my_chain_id_test/Cancun/tx_type_1": {
         "_info": {
-            "hash": "0x49130f37343fa73f364ed83e2a2e7146c4effa64cdb6b371f5f2bf3f2004fade",
+            "hash": "0x0c9cdd9849022dfb46f20fc00a646394a58e0fc8847f6e3cf578dff67378e6bc",
             "fixture_format": "state_test"
         },
         "env": {
@@ -39,6 +39,7 @@
             }
         },
         "transaction": {
+            "chainId": "0x01",
             "accessLists": [
                 [
                     {