anchor.diff:          var collectionName = getRandomCollectionName();
           var collection = db.collection(collectionName);
   
  -        var uuid = UuidValue.v4();
  +        var uuid = Uuid().v4obj();
           await collection.insertOne({'uuid': uuid, 'null': null});
   
           await collection.updateOne(
  
positive.code:       test('replace Uuid', () async {
          var collectionName = getRandomCollectionName();
          var collection = db.collection(collectionName);
          var uuid = UuidValue.v4();
          await collection.insertOne({'uuid': uuid, 'null': null});
  
          var uuidNew = UuidValue.v4();
          await collection.replaceOne(
              where.eq('notNull', 0), {'uuid': uuidNew, 'notNull': 0},
              upsert: true);
  
negative.code:       test('delete Uuid', () async {
          var collectionName = getRandomCollectionName();
          var collection = db.collection(collectionName);
          var uuid = Uuid().v4obj();
          await collection.insertOne({'uuid': uuid, 'null': null});
  
          await collection.deleteOne(where.eq('uuid', uuid));
  