public double getAverage() {
    return _average;
  }
@Test
  public void testAvgInitialization() {
    assertEquals(new ExponentialMovingAverage(0.5, -1, 0, 1.0, _executorService).getAverage(), 1.0);
    assertEquals(new ExponentialMovingAverage(0.5, -1, 0, 0.123, _executorService).getAverage(), 0.123);
    assertEquals(new ExponentialMovingAverage(0.5, -1, 0, 88.0, _executorService).getAverage(), 88.0);
    assertEquals(new ExponentialMovingAverage(0.5, -1, 0, 0.0, _executorService).getAverage(), 0.0);
  }