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

Main for running test case by itself.

 public  void setUp() throws IOException 
{
        workDir = new File(System.getProperty("tempDir"),"TestDoc");
        workDir.mkdirs();
        indexDir = new File(workDir, "testIndex");
        indexDir.mkdirs();
        Directory directory = FSDirectory.getDirectory(indexDir, true);
        directory.close();
        files = new LinkedList();
        files.add(createFile("test.txt",
            "This is the first test file"
        ));
        files.add(createFile("test2.txt",
            "This is the second test file"
        ));
}

Set the test case. This test case needs a few text files created in the current working directory.

 public  void testIndexAndMerge() throws Exception 
{
      StringWriter sw = new StringWriter();
      PrintWriter out = new PrintWriter(sw, true);
      Directory directory = FSDirectory.getDirectory(indexDir, true);
      directory.close();
      indexDoc("one", "test.txt");
      printSegment(out, "one");
      indexDoc("two", "test2.txt");
      printSegment(out, "two");
      merge("one", "two", "merge", false);
      printSegment(out, "merge");
      merge("one", "two", "merge2", false);
      printSegment(out, "merge2");
      merge("merge", "merge2", "merge3", false);
      printSegment(out, "merge3");
      out.close();
      sw.close();
      String multiFileOutput = sw.getBuffer().toString();
      //System.out.println(multiFileOutput);
      sw = new StringWriter();
      out = new PrintWriter(sw, true);
      directory = FSDirectory.getDirectory(indexDir, true);
      directory.close();
      indexDoc("one", "test.txt");
      printSegment(out, "one");
      indexDoc("two", "test2.txt");
      printSegment(out, "two");
      merge("one", "two", "merge", true);
      printSegment(out, "merge");
      merge("one", "two", "merge2", true);
      printSegment(out, "merge2");
      merge("merge", "merge2", "merge3", true);
      printSegment(out, "merge3");
      out.close();
      sw.close();
      String singleFileOutput = sw.getBuffer().toString();
      assertEquals(multiFileOutput, singleFileOutput);
}

This test executes a number of merges and compares the contents of the segments created when using compound file or not using one. TODO: the original test used to print the segment contents to System.out for visual validation. To have the same effect, a new method checkSegment(String name, ...) should be created that would assert various things about the segment.