Lucene.Net.Search.TestDocIdSet.TestFilteredDocIdSet C# (CSharp) Method

        public virtual void TestFilteredDocIdSet()
        {
            const int maxdoc = 10;
            DocIdSet innerSet = new DocIdSetAnonymousInnerClassHelper(this, maxdoc);

            DocIdSet filteredSet = new FilteredDocIdSetAnonymousInnerClassHelper(this, innerSet);

            DocIdSetIterator iter = filteredSet.GetIterator();
            List<int?> list = new List<int?>();
            int doc = iter.Advance(3);
            if (doc != DocIdSetIterator.NO_MORE_DOCS)
            {
                list.Add(Convert.ToInt32(doc));
                while ((doc = iter.NextDoc()) != DocIdSetIterator.NO_MORE_DOCS)
                {
                    list.Add(Convert.ToInt32(doc));
                }
            }

            int[] docs = new int[list.Count];
            int c = 0;
            IEnumerator<int?> intIter = list.GetEnumerator();
            while (intIter.MoveNext())
            {
                docs[c++] = (int)intIter.Current;
            }
            int[] answer = new int[] { 4, 6, 8 };
            bool same = Arrays.Equals(answer, docs);
            if (!same)
            {
                Console.WriteLine("answer: " + Arrays.ToString(answer));
                Console.WriteLine("gotten: " + Arrays.ToString(docs));
                Assert.Fail();
            }
        }