code: package zemberek.corpus;
  
  import java.io.IOException;
  import org.apache.lucene.analysis.Analyzer;
  import org.apache.lucene.analysis.custom.CustomAnalyzer;
  import org.apache.lucene.analysis.standard.StandardAnalyzer;
  import org.apache.lucene.document.Document;
  import org.apache.lucene.document.Field;
  import org.apache.lucene.document.TextField;
  import org.apache.lucene.index.DirectoryReader;
  import org.apache.lucene.index.IndexReader;
  import org.apache.lucene.index.IndexWriter;
  import org.apache.lucene.index.IndexWriterConfig;
  import org.apache.lucene.index.Term;
  import org.apache.lucene.queryparser.classic.ParseException;
  import org.apache.lucene.queryparser.classic.QueryParser;
  import org.apache.lucene.search.IndexSearcher;
  import org.apache.lucene.search.Query;
  import org.apache.lucene.search.TermQuery;
  import org.apache.lucene.search.TopDocs;
  import org.apache.lucene.store.RAMDirectory;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  
  public class LuceneLemmaFilterTest {
  
    private IndexSearcher searcher;
    QueryParser parser;
  
    @Before
    public void setUp() throws Exception {
  
      Analyzer analyzer = CustomAnalyzer.builder()
          .withTokenizer("standard")
          .addTokenFilter(LuceneLemmaFilter.Factory.class)
          .build();
  
      Analyzer searchAnalyzer = new StandardAnalyzer();
  
      RAMDirectory directory = new RAMDirectory();
      IndexWriter writer = new IndexWriter(directory, new IndexWriterConfig(analyzer));
      Document doc = new Document();
      doc.add(new TextField("content",
          "çoğu günler limonlu kekten aldırdım",
          Field.Store.YES));
      writer.addDocument(doc);
  
      writer.close();
  
      IndexReader reader = DirectoryReader.open(directory);
  
      searcher = new IndexSearcher(reader);
      parser = new QueryParser("content", searchAnalyzer);
    }
  
    @Test
    public void testWordSearch() throws IOException {
      TermQuery tq = new TermQuery(new Term("content", "çok"));
      TopDocs hits = searcher.search(tq, 10);
      Assert.assertEquals(1, hits.totalHits);
    }
  
    @Test
    public void testMultiWordSearch() throws IOException, ParseException {
  
      Query query = parser.parse("\"limon kek\"");
      TopDocs hits = searcher.search(query, 10);
      Assert.assertEquals(1, hits.totalHits);
    }
  
  }
  
  