public void AddSnapshot_SessionIsNotAutoClose_SnapshotShouldBeSavedInMemory()
        {
            var snapshot = new Snapshot
            {
                Id        = "NewSnapshotId",
                SessionId = "SessionId"
            };

            var session = new Session
            {
                Id = "SessionId"
            };

            inMemoryStorage.Clear();
            inMemoryStorage.Add(session);

            subject.Add(snapshot);

            var result = inMemoryStorage.GetSnapshot(snapshot.SessionId, snapshot.Id);

            result.Should().NotBeNull();
        }