assertThat(ONE_VALUE_STATS.mean()).isWithin(ALLOWED_ERROR).of(ONE_VALUE);
    assertThat(Stats.of(POSITIVE_INFINITY).mean()).isPositiveInfinity();
    assertThat(Stats.of(NEGATIVE_INFINITY).mean()).isNegativeInfinity();
    assertThat(Stats.of(NaN).mean()).isNaN();
    assertThat(TWO_VALUES_STATS.mean()).isWithin(ALLOWED_ERROR).of(TWO_VALUES_MEAN);

            .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)

            .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();

      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)