public double mergeAvgColLen(double oldValue, double newValue) {
    return Math.max(oldValue, newValue);
  }
@Test
  public void testMergeAvgColLen() {
    assertEquals(3, MERGER.mergeAvgColLen(1, 3), Double.MIN_VALUE);
    assertEquals(3, MERGER.mergeAvgColLen(3, 1), Double.MIN_VALUE);
  }