internal/blocktest: add package for shared test code (#27270)

core/rawdb/accessors_indexes_test.go

@@ -18,42 +18,18 @@ package rawdb
 
 import (
 	"bytes"
-	"hash"
 	"math/big"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/internal/blocktest"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
-	"golang.org/x/crypto/sha3"
 )
 
-// testHasher is the helper tool for transaction/receipt list hashing.
-// The original hasher is trie, in order to get rid of import cycle,
-// use the testing hasher instead.
-type testHasher struct {
-	hasher hash.Hash
-}
-
-func newHasher() *testHasher {
-	return &testHasher{hasher: sha3.NewLegacyKeccak256()}
-}
-
-func (h *testHasher) Reset() {
-	h.hasher.Reset()
-}
-
-func (h *testHasher) Update(key, val []byte) error {
-	h.hasher.Write(key)
-	h.hasher.Write(val)
-	return nil
-}
-
-func (h *testHasher) Hash() common.Hash {
-	return common.BytesToHash(h.hasher.Sum(nil))
-}
+var newHasher = blocktest.NewHasher
 
 // Tests that positional lookup metadata can be stored and retrieved.
 func TestLookupStorage(t *testing.T) {