.isPositiveInfinity();
      } else if (values.hasAnyNegativeInfinity()) {
        assertWithMessage("mean of " + values).that(mean).isNegativeInfinity();
        assertWithMessage("mean by addAll(Stats) of " + values)
            .that(meanByAddAllStats)
            .isNegativeInfinity();
      } else {
        assertWithMessage("mean of " + values)
            .that(mean)
            .isWithin(ALLOWED_ERROR)

      assertTrue(Double.isNaN(DoubleMath.log2(-d)));
    }
  }

  public void testLog2Zero() {
    assertThat(DoubleMath.log2(0.0)).isNegativeInfinity();
    assertThat(DoubleMath.log2(-0.0)).isNegativeInfinity();
  }

  public void testLog2NaNInfinity() {
    assertThat(DoubleMath.log2(Double.POSITIVE_INFINITY)).isPositiveInfinity();

    // interpolating between NEGATIVE_INFINITY and 1.0
    assertThat(Quantiles.scale(10).index(1).compute(ONE_TO_FIVE_AND_NEGATIVE_INFINITY))
        .isNegativeInfinity();
  }

  public void testScale_indexes_varargs_compute_doubleCollection_bothInfinities() {
    assertThat(
            Quantiles.scale(10)
                .indexes(0, 1, 2, 8, 9, 10)

    // interpolating between NEGATIVE_INFINITY and 1.0
    assertThat(Quantiles.scale(10).index(1).compute(ONE_TO_FIVE_AND_NEGATIVE_INFINITY))
        .isNegativeInfinity();
  }

  public void testScale_indexes_varargs_compute_doubleCollection_bothInfinities() {
    assertThat(
            Quantiles.scale(10)
                .indexes(0, 1, 2, 8, 9, 10)