public Progress getSortPhase() {
    return sortPhase;
  }
@Test
  public void testSpillFilesCountBreach() throws Exception {
    JobConf conf = new JobConf();
    conf.set(CommonConfigurationKeys.FS_PERMISSIONS_UMASK_KEY, "077");
    conf.set(MRConfig.LOCAL_DIR, testRootDir.getAbsolutePath());
    conf.setInt(MRJobConfig.SPILL_FILES_COUNT_LIMIT, 2);
    MapOutputFile mof = new MROutputFiles();
    mof.setConf(conf);
    TaskAttemptID attemptId = new TaskAttemptID("12345", 1, TaskType.MAP, 1, 1);
    MapTask mockTask = mock(MapTask.class);
    doReturn(mof).when(mockTask).getMapOutputFile();
    doReturn(attemptId).when(mockTask).getTaskID();
    doReturn(new Progress()).when(mockTask).getSortPhase();
    TaskReporter mockReporter = mock(TaskReporter.class);
    doReturn(new Counter()).when(mockReporter).getCounter(any(TaskCounter.class));
    MapOutputCollector.Context ctx = new MapOutputCollector.Context(mockTask, conf, mockReporter);
    MapOutputBuffer<Object, Object> mob = new MapOutputBuffer<>();
    mob.numSpills = 2;
    mob.init(ctx);

    Method method = mob.getClass().getDeclaredMethod("incrementNumSpills");
    method.setAccessible(true);
    boolean gotExceptionWithMessage = false;
    try {
      method.invoke(mob);
    } catch(InvocationTargetException e) {
      Throwable targetException = e.getTargetException();
      if (targetException != null) {
        String errorMessage = targetException.getMessage();
        if (errorMessage != null) {
          if(errorMessage.equals("Too many spill files got created, control it with " +
              "mapreduce.task.spill.files.count.limit, current value: 2, current spill count: 3")) {
            gotExceptionWithMessage = true;
          }
        }
      }
    }

    mob.close();

    Assert.assertTrue(gotExceptionWithMessage);
  }