♻️ Refactor synchronization service

internal/syncer/merge/updated_at_wins_test.go

@@ -0,0 +1,50 @@
+package merge
+
+import (
+	"context"
+	"testing"
+	"time"
+	"voidraft/internal/syncer/snapshot"
+)
+
+// TestUpdatedAtWinsMergerMerge 验证较新的记录会覆盖较旧记录。
+func TestUpdatedAtWinsMergerMerge(t *testing.T) {
+	localRecord, err := snapshot.NewRecord("documents", "doc-1", map[string]interface{}{
+		"uuid":       "doc-1",
+		"updated_at": time.Date(2026, 3, 29, 9, 0, 0, 0, time.UTC).Format(time.RFC3339),
+		"title":      "local",
+	}, nil)
+	if err != nil {
+		t.Fatalf("build local record: %v", err)
+	}
+
+	remoteRecord, err := snapshot.NewRecord("documents", "doc-1", map[string]interface{}{
+		"uuid":       "doc-1",
+		"updated_at": time.Date(2026, 3, 29, 10, 0, 0, 0, time.UTC).Format(time.RFC3339),
+		"title":      "remote",
+	}, nil)
+	if err != nil {
+		t.Fatalf("build remote record: %v", err)
+	}
+
+	localSnapshot := snapshot.New()
+	localSnapshot.Resources["documents"] = []snapshot.Record{localRecord}
+
+	remoteSnapshot := snapshot.New()
+	remoteSnapshot.Resources["documents"] = []snapshot.Record{remoteRecord}
+
+	merger := NewUpdatedAtWinsMerger()
+	merged, report, err := merger.Merge(context.Background(), localSnapshot, remoteSnapshot)
+	if err != nil {
+		t.Fatalf("merge snapshot: %v", err)
+	}
+
+	if report.Updated != 1 {
+		t.Fatalf("expected updated report to be 1, got %d", report.Updated)
+	}
+
+	record := merged.Resources["documents"][0]
+	if got := record.Values["title"]; got != "remote" {
+		t.Fatalf("expected remote title, got %v", got)
+	}
+}