Quantiles.Scale intermediate = Quantiles.scale(10);
    assertThrows(
        IllegalArgumentException.class, () -> intermediate.indexes(ImmutableList.of(1, 11, 3)));
  }

  public void testScale_index_compute_doubleCollection_empty() {
    Quantiles.ScaleAndIndex intermediate = Quantiles.scale(10).index(3);
    assertThrows(IllegalArgumentException.class, () -> intermediate.compute(EMPTY_DATASET));
  }