Lucene.Net.Index.BaseTermVectorsFormatTestCase.TestRareVectors C# (CSharp) Method

        public virtual void TestRareVectors()
        {
            RandomDocumentFactory docFactory = new RandomDocumentFactory(this, 10, 20);
            foreach (Options options in ValidOptions())
            {
                int numDocs = AtLeast(200);
                int docWithVectors = Random().Next(numDocs);
                Document emptyDoc = new Document();
                Directory dir = NewDirectory();
                RandomIndexWriter writer = new RandomIndexWriter(Random(), dir, ClassEnvRule.Similarity, ClassEnvRule.TimeZone);
                RandomDocument doc = docFactory.NewDocument(TestUtil.NextInt(Random(), 1, 3), 20, options);
                for (int i = 0; i < numDocs; ++i)
                {
                    if (i == docWithVectors)
                    {
                        writer.AddDocument(AddId(doc.ToDocument(), "42"));
                    }
                    else
                    {
                        writer.AddDocument(emptyDoc);
                    }
                }
                IndexReader reader = writer.Reader;
                int docWithVectorsID = DocID(reader, "42");
                for (int i = 0; i < 10; ++i)
                {
                    int docID = Random().Next(numDocs);
                    Fields fields = reader.GetTermVectors(docID);
                    if (docID == docWithVectorsID)
                    {
                        AssertEquals(doc, fields);
                    }
                    else
                    {
                        Assert.IsNull(fields);
                    }
                }
                Fields fields_ = reader.GetTermVectors(docWithVectorsID);
                AssertEquals(doc, fields_);
                reader.Dispose();
                writer.Dispose();
                dir.Dispose();
            }
        }