@Deprecated
  public static void addFileToClassPath(Path file, Configuration conf) throws IOException {
    Job.addFileToClassPath(file, conf, file.getFileSystem(conf));
  }
@Test
  public void testAddFileToClassPath() throws Exception {
    Configuration conf = new Configuration(false);

    // Test first with 2 args
    try {
      DistributedCache.addFileToClassPath(null, conf);
      fail("Accepted null archives argument");
    } catch (NullPointerException ex) {
      // Expected
    }

    DistributedCache.addFileToClassPath(new Path("file:///a"), conf);
    assertEquals("The mapreduce.job.classpath.files property was not "
        + "set correctly", "file:/a", conf.get(MRJobConfig.CLASSPATH_FILES));
    assertEquals("The mapreduce.job.cache.files property was not set "
        + "correctly", "file:///a", conf.get(MRJobConfig.CACHE_FILES));

    DistributedCache.addFileToClassPath(new Path("file:///b"), conf);
    assertEquals("The mapreduce.job.classpath.files property was not "
        + "set correctly", "file:/a,file:/b",
        conf.get(MRJobConfig.CLASSPATH_FILES));
    assertEquals("The mapreduce.job.cache.files property was not set "
        + "correctly", "file:///a,file:///b",
        conf.get(MRJobConfig.CACHE_FILES));

    // Now test with 3 args
    FileSystem fs = FileSystem.newInstance(conf);
    conf.clear();

    try {
      DistributedCache.addFileToClassPath(null, conf, fs);
      fail("Accepted null archives argument");
    } catch (NullPointerException ex) {
      // Expected
    }

    DistributedCache.addFileToClassPath(new Path("file:///a"), conf, fs);
    assertEquals("The mapreduce.job.classpath.files property was not "
        + "set correctly", "file:/a", conf.get(MRJobConfig.CLASSPATH_FILES));
    assertEquals("The mapreduce.job.cache.files property was not set "
        + "correctly", "file:///a", conf.get(MRJobConfig.CACHE_FILES));

    DistributedCache.addFileToClassPath(new Path("file:///b"), conf, fs);
    assertEquals("The mapreduce.job.classpath.files property was not "
        + "set correctly", "file:/a,file:/b",
        conf.get(MRJobConfig.CLASSPATH_FILES));
    assertEquals("The mapreduce.job.cache.files property was not set "
        + "correctly", "file:///a,file:///b",
        conf.get(MRJobConfig.CACHE_FILES));

    // Now test with 4th arg true
    conf.clear();

    try {
      DistributedCache.addFileToClassPath(null, conf, fs, true);
      fail("Accepted null archives argument");
    } catch (NullPointerException ex) {
      // Expected
    }

    DistributedCache.addFileToClassPath(new Path("file:///a"), conf, fs, true);
    assertEquals("The mapreduce.job.classpath.files property was not "
        + "set correctly", "file:/a", conf.get(MRJobConfig.CLASSPATH_FILES));
    assertEquals("The mapreduce.job.cache.files property was not set "
        + "correctly", "file:///a", conf.get(MRJobConfig.CACHE_FILES));

    DistributedCache.addFileToClassPath(new Path("file:///b"), conf, fs, true);
    assertEquals("The mapreduce.job.classpath.files property was not "
        + "set correctly", "file:/a,file:/b",
        conf.get(MRJobConfig.CLASSPATH_FILES));
    assertEquals("The mapreduce.job.cache.files property was not set "
        + "correctly", "file:///a,file:///b",
        conf.get(MRJobConfig.CACHE_FILES));

    // And finally with 4th arg false
    conf.clear();

    try {
      DistributedCache.addFileToClassPath(null, conf, fs, false);
      fail("Accepted null archives argument");
    } catch (NullPointerException ex) {
      // Expected
    }

    DistributedCache.addFileToClassPath(new Path("file:///a"), conf, fs, false);
    assertEquals("The mapreduce.job.classpath.files property was not "
        + "set correctly", "file:/a", conf.get(MRJobConfig.CLASSPATH_FILES));
    assertEquals("The mapreduce.job.cache.files property was not set "
        + "correctly", "", conf.get(MRJobConfig.CACHE_FILES, ""));

    DistributedCache.addFileToClassPath(new Path("file:///b"), conf, fs, false);
    assertEquals("The mapreduce.job.classpath.files property was not "
        + "set correctly", "file:/a,file:/b",
        conf.get(MRJobConfig.CLASSPATH_FILES));
    assertEquals("The mapreduce.job.cache.files property was not set "
        + "correctly", "", conf.get(MRJobConfig.CACHE_FILES, ""));
  }