Update database.dart

docs/lib/snippets/setup/database.dart

@@ -35,7 +35,7 @@ class AppDatabase extends _$AppDatabase {
   // After generating code, this class needs to define a `schemaVersion` getter
   // and a constructor telling drift where the database should be stored.
   // These are described in the getting started guide: https://drift.simonbinder.eu/setup/
-  AppDatabase() : super(_openConnection());
+  AppDatabase([QueryExecutor? executor]) : super(executor ?? _openConnection());
 
   @override
   int get schemaVersion => 1;