anchor.diff:      await db.open();
     }
   
  -  Future insertManyDocuments(
  -      DbCollection collection, int numberOfRecords) async {
  -    await collection.remove(<String, dynamic>{});
  -    var toInsert = <Map<String, dynamic>>[];
  -    for (var n = 0; n < numberOfRecords; n++) {
  -      toInsert.add({'a': Rational.fromInt(n)});
  -    }
  -
  -    await collection.insertAll(toInsert);
  -  }
  -
     Future cleanupDatabase() async {
       await db.close();
     }
  
positive.code:         var collectionName = getRandomCollectionName();
          var collection = db.collection(collectionName);
  
          var uuid = UuidValue.v4();
          await collection.insertOne({'uuid': uuid, 'null': null});
  
          await collection.updateOne(
  
negative.code: @Timeout(Duration(seconds: 100))
  
  import 'package:mongo_dart/mongo_dart.dart';
  import 'package:test/test.dart';
  import 'package:uuid/uuid.dart' hide UuidValue;
  
  