public static  void main(String[] args) 
{
    TestRunner.run (new TestSuite(TestIndexReader.class));
}

Main for running test case by itself.

 public  void testFilterIndexReader() throws Exception 
{
    RAMDirectory directory = new RAMDirectory();
    IndexWriter writer =
      new IndexWriter(directory, new WhitespaceAnalyzer(), true);
    Document d1 = new Document();
    d1.add(Field.Text("default","one two"));
    writer.addDocument(d1);
    Document d2 = new Document();
    d2.add(Field.Text("default","one three"));
    writer.addDocument(d2);
    Document d3 = new Document();
    d3.add(Field.Text("default","two four"));
    writer.addDocument(d3);
    writer.close();
    IndexReader reader = new TestReader(IndexReader.open(directory));
    TermEnum terms = reader.terms();
    while (terms.next()) {
      assertTrue(terms.term().text().indexOf('e") != -1);
    }
    terms.close();
    TermPositions positions = reader.termPositions(new Term("default", "one"));
    while (positions.next()) {
      assertTrue((positions.doc() % 2) == 1);
    }
    reader.close();
}

Tests the IndexReader.getFieldNames implementation