add testcase

Signed-off-by: jsvisa <delweng@gmail.com>

triedb/pathdb/history_indexer_test.go

@@ -0,0 +1,57 @@
+// Copyright 2025 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 pathdb
+
+import (
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/core/rawdb"
+	"github.com/ethereum/go-ethereum/ethdb"
+)
+
+// TestHistoryIndexerShortenDeadlock tests that a call to shorten does not
+// deadlock when the indexer is active. This specifically targets the case where
+// signal.result must be sent to unblock the caller.
+func TestHistoryIndexerShortenDeadlock(t *testing.T) {
+	db := rawdb.NewMemoryDatabase()
+	freezer, _ := rawdb.NewStateFreezer(t.TempDir(), false, false)
+	histories := makeHistories(1000)
+
+	// Assume we only have 100 histories indexed
+	for i, h := range histories[:100] {
+		accountData, storageData, accountIndex, storageIndex := h.encode()
+		rawdb.WriteStateHistory(freezer.(ethdb.AncientWriter), uint64(i+1), h.meta.encode(), accountIndex, storageIndex, accountData, storageData)
+	}
+	indexer := newHistoryIndexer(db, freezer, uint64(len(histories)))
+	defer indexer.close()
+	defer freezer.Close()
+
+	done := make(chan error, 1)
+	go func() {
+		done <- indexer.shorten(uint64(len(histories)))
+	}()
+
+	select {
+	case err := <-done:
+		if err != nil {
+			t.Fatalf("shorten returned an unexpected error: %v", err)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("timed out waiting for shorten to complete, potential deadlock")
+	}
+}