Added a test to prove code change at block level works

eth/tracers/internal/tracetest/firehose/polygon_test.go

@@ -0,0 +1,42 @@
+package firehose_test
+
+import (
+	"math/big"
+	"path/filepath"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/tracing"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/trie"
+)
+
+func TestPolygon_TracerBlockLevelOnCodeChange(t *testing.T) {
+	tracer, hooks, onClose := newFirehoseTestTracer(t, tracingModelFirehose2_3)
+	defer onClose()
+
+	hooks.OnBlockchainInit(params.BorMainnetChainConfig)
+	hooks.OnBlockStart(tracing.BlockEvent{Block: testBlock()})
+	hooks.OnCodeChange(common.Address{}, common.BytesToHash([]byte{0x01}), []byte{0x01}, common.BytesToHash([]byte{0x02}), []byte{0x02})
+	hooks.OnBlockEnd(nil)
+
+	assertBlockEquals(t, tracer, filepath.Join("testdata", "PolygonBlockLevelCodeChange"), 1)
+}
+
+func testBlock() *types.Block {
+	block := types.NewBlock(&types.Header{
+		ParentHash:       common.Hash{},
+		Number:           big.NewInt(1),
+		Difficulty:       big.NewInt(0),
+		Coinbase:         common.Address{},
+		Time:             1,
+		GasLimit:         210000,
+		BaseFee:          big.NewInt(1000000000),
+		ParentBeaconRoot: ptr(common.Hash{}),
+	}, &types.Body{
+		Transactions: []*types.Transaction{},
+	}, nil, trie.NewStackTrie(nil))
+
+	return block
+}

eth/tracers/internal/tracetest/firehose/testdata/PolygonBlockLevelCodeChange/block.1.golden.json

@@ -0,0 +1,37 @@
+{
+  "codeChanges": [
+    {
+      "address": "AAAAAAAAAAAAAAAAAAAAAAAAAAA=",
+      "newCode": "Ag==",
+      "newHash": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAI=",
+      "oldCode": "AQ==",
+      "oldHash": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAE=",
+      "ordinal": "1"
+    }
+  ],
+  "hash": "WLGMKK1ccyTrarRdy4zscMOz8v4oSRmSquZyaMFyvTA=",
+  "header": {
+    "baseFeePerGas": {
+      "bytes": "O5rKAA=="
+    },
+    "coinbase": "AAAAAAAAAAAAAAAAAAAAAAAAAAA=",
+    "difficulty": {
+      "bytes": "AA=="
+    },
+    "gasLimit": "210000",
+    "hash": "WLGMKK1ccyTrarRdy4zscMOz8v4oSRmSquZyaMFyvTA=",
+    "logsBloom": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==",
+    "mixHash": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=",
+    "number": "1",
+    "parentBeaconRoot": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=",
+    "parentHash": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=",
+    "receiptRoot": "VugfFxvMVab/g0XmksD4bltI4BuZbK3AAWIvteNjtCE=",
+    "stateRoot": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=",
+    "timestamp": "1970-01-01T00:00:01Z",
+    "transactionsRoot": "VugfFxvMVab/g0XmksD4bltI4BuZbK3AAWIvteNjtCE=",
+    "uncleHash": "HcxN6N7HXXqrhbVntszUGtMSRRuUinQT8KFC/UDUk0c="
+  },
+  "number": "1",
+  "size": "545",
+  "ver": 3
+}