triedb: add test suite for preimage store (#31574)

triedb/preimages_test.go

@@ -0,0 +1,78 @@
+// 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 triedb
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/rawdb"
+	"github.com/ethereum/go-ethereum/triedb/hashdb"
+)
+
+// TestDatabasePreimages tests the preimage functionality of the trie database.
+func TestDatabasePreimages(t *testing.T) {
+	// Create a database with preimages enabled
+	memDB := rawdb.NewMemoryDatabase()
+	config := &Config{
+		Preimages: true,
+		HashDB:    hashdb.Defaults,
+	}
+	db := NewDatabase(memDB, config)
+	defer db.Close()
+
+	// Test inserting and retrieving preimages
+	preimages := make(map[common.Hash][]byte)
+	for i := 0; i < 10; i++ {
+		data := []byte{byte(i), byte(i + 1), byte(i + 2)}
+		hash := common.BytesToHash(data)
+		preimages[hash] = data
+	}
+
+	// Insert preimages into the database
+	db.InsertPreimage(preimages)
+
+	// Verify all preimages are retrievable
+	for hash, data := range preimages {
+		retrieved := db.Preimage(hash)
+		if retrieved == nil {
+			t.Errorf("Preimage for %x not found", hash)
+		}
+		if !bytes.Equal(retrieved, data) {
+			t.Errorf("Preimage data mismatch: got %x want %x", retrieved, data)
+		}
+	}
+
+	// Test non-existent preimage
+	nonExistentHash := common.HexToHash("deadbeef")
+	if data := db.Preimage(nonExistentHash); data != nil {
+		t.Errorf("Unexpected preimage data for non-existent hash: %x", data)
+	}
+
+	// Force preimage commit and verify again
+	db.WritePreimages()
+	for hash, data := range preimages {
+		retrieved := db.Preimage(hash)
+		if retrieved == nil {
+			t.Errorf("Preimage for %x not found after forced commit", hash)
+		}
+		if !bytes.Equal(retrieved, data) {
+			t.Errorf("Preimage data mismatch after forced commit: got %x want %x", retrieved, data)
+		}
+	}
+}