Lucene.Net.TestSearch_.TestNegativeQueryBoost C# (CSharp) Method

        public virtual void TestNegativeQueryBoost()
        {
            Query q = new TermQuery(new Term("foo", "bar"));
            q.Boost = -42f;
            Assert.AreEqual(-42f, q.Boost, 0.0f);

            Store.Directory directory = NewDirectory();
            try
            {
                Analyzer analyzer = new MockAnalyzer(Random());
                IndexWriterConfig conf = NewIndexWriterConfig(TEST_VERSION_CURRENT, analyzer);

                IndexWriter writer = new IndexWriter(directory, conf);
                try
                {
                    Documents.Document d = new Documents.Document();
                    d.Add(NewTextField("foo", "bar", Field.Store.YES));
                    writer.AddDocument(d);
                }
                finally
                {
                    writer.Dispose();
                }

                IndexReader reader = DirectoryReader.Open(directory);
                try
                {
                    IndexSearcher searcher = NewSearcher(reader);

                    ScoreDoc[] hits = searcher.Search(q, null, 1000).ScoreDocs;
                    Assert.AreEqual(1, hits.Length);
                    Assert.IsTrue(hits[0].Score < 0, "score is not negative: " + hits[0].Score);

                    Explanation explain = searcher.Explain(q, hits[0].Doc);
                    Assert.AreEqual(hits[0].Score, explain.Value, 0.001f, "score doesn't match explanation");
                    Assert.IsTrue(explain.IsMatch, "explain doesn't think doc is a match");

                }
                finally
                {
                    reader.Dispose();
                }
            }
            finally
            {
                directory.Dispose();
            }

        }