public void GetNumberOfProblem()
        {
            var members = _session.List <Member>(2).Get();

            _conn.Collection <Member>(CollectionNames.Member).InsertBatch(members);

            var generatedProblems = _session.List <Problem>(20)
                                    .Random(10)
                                    .Impose(x => x.UserId, members[0].Id)
                                    .Next(10)
                                    .Impose(x => x.UserId, members[1].Id)
                                    .All().Get();

            _problemCollection.InsertBatch(generatedProblems);

            var count = _problemRepository.Count();

            Assert.That(count, Is.EqualTo(20));
        }