Lucene.Net.Index.TestBinaryDocValuesUpdates.TestUpdatesAndDeletes C# (CSharp) Method

        public virtual void TestUpdatesAndDeletes()
        {
            // create an index with a segment with only deletes, a segment with both
            // deletes and updates and a segment with only updates
            Directory dir = NewDirectory();
            IndexWriterConfig conf = NewIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(Random()));
            conf.SetMaxBufferedDocs(10); // control segment flushing
            conf.SetMergePolicy(NoMergePolicy.COMPOUND_FILES); // prevent merges for this test
            IndexWriter writer = new IndexWriter(dir, conf);

            for (int i = 0; i < 6; i++)
            {
                writer.AddDocument(Doc(i));
                if (i % 2 == 1)
                {
                    writer.Commit(); // create 2-docs segments
                }
            }

            // delete doc-1 and doc-2
            writer.DeleteDocuments(new Term("id", "doc-1"), new Term("id", "doc-2")); // 1st and 2nd segments

            // update docs 3 and 5
            writer.UpdateBinaryDocValue(new Term("id", "doc-3"), "val", ToBytes(17L));
            writer.UpdateBinaryDocValue(new Term("id", "doc-5"), "val", ToBytes(17L));

            DirectoryReader reader;
            if (Random().NextBoolean()) // not NRT
            {
                writer.Dispose();
                reader = DirectoryReader.Open(dir);
            } // NRT
            else
            {
                reader = DirectoryReader.Open(writer, true);
                writer.Dispose();
            }

            AtomicReader slow = SlowCompositeReaderWrapper.Wrap(reader);

            Bits liveDocs = slow.LiveDocs;
            bool[] expectedLiveDocs = new bool[] { true, false, false, true, true, true };
            for (int i = 0; i < expectedLiveDocs.Length; i++)
            {
                Assert.AreEqual(expectedLiveDocs[i], liveDocs.Get(i));
            }

            long[] expectedValues = new long[] { 1, 2, 3, 17, 5, 17 };
            BinaryDocValues bdv = slow.GetBinaryDocValues("val");
            BytesRef scratch = new BytesRef();
            for (int i = 0; i < expectedValues.Length; i++)
            {
                Assert.AreEqual(expectedValues[i], GetValue(bdv, i, scratch));
            }

            reader.Dispose();
            dir.Dispose();
        }