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

internal/blocktest/test_hash.go

@@ -0,0 +1,59 @@
+// Copyright 2023 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Package utesting provides a standalone replacement for package testing.
+//
+// This package exists because package testing cannot easily be embedded into a
+// standalone go program. It provides an API that mirrors the standard library
+// testing API.
+
+package blocktest
+
+import (
+	"hash"
+
+	"github.com/ethereum/go-ethereum/common"
+	"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
+}
+
+// NewHasher returns a new testHasher instance.
+func NewHasher() *testHasher {
+	return &testHasher{hasher: sha3.NewLegacyKeccak256()}
+}
+
+// Reset resets the hash state.
+func (h *testHasher) Reset() {
+	h.hasher.Reset()
+}
+
+// Update updates the hash state with the given key and value.
+func (h *testHasher) Update(key, val []byte) error {
+	h.hasher.Write(key)
+	h.hasher.Write(val)
+	return nil
+}
+
+// Hash returns the hash value.
+func (h *testHasher) Hash() common.Hash {
+	return common.BytesToHash(h.hasher.Sum(nil))
+}