@Override
    double roundToDoubleArbitrarily(BigDecimal bigDecimal) {
      return bigDecimal.doubleValue();
    }

    @Override
    int sign(BigDecimal bigDecimal) {
      return bigDecimal.signum();
    }

    @Override
    BigDecimal toX(double d, RoundingMode mode) {
      return new BigDecimal(d);
    }

    @Override
    BigDecimal minus(BigDecimal a, BigDecimal b) {
      return a.subtract(b);
    }
  }

    protected abstract List<Units<Q>> getUnitsForQuantity();

    protected abstract BigDecimal getFactor();

    protected abstract BigDecimal scaleTo(BigDecimal value, Units<Q> units);

    protected String format(BigDecimal value) {
        return value.compareTo(BigDecimal.ONE) == 0 ? displaySingular : displayPlural;
    }

    private static class BaseUnits<Q> extends Units<Q> {

            displaySize = new BigDecimal(size.divide(ONE_PB_BI)).divide(BigDecimal.valueOf(1000)) + "EB";
        } else if (size.divide(ONE_PB_BI).compareTo(BigInteger.ZERO) > 0) {
            displaySize = new BigDecimal(size.divide(ONE_TB_BI)).divide(BigDecimal.valueOf(1000)) + "PB";
        } else if (size.divide(ONE_TB_BI).compareTo(BigInteger.ZERO) > 0) {

    }

    public Amount<Q> multiply(BigDecimal other) {
        return new Amount<>(value.multiply(other), units);
    }

    public Amount<Q> div(long other) {
        return div(BigDecimal.valueOf(other));
    }
    public Amount<Q> div(BigDecimal other) {
        return new Amount<>(value.divide(other, 6, RoundingMode.HALF_UP), units);
    }

    public BigDecimal div(Amount<Q> other) {

        .test();
  }

  public void testRoundToDouble_maxDouble() {
    BigDecimal maxDoubleAsBD = new BigDecimal(Double.MAX_VALUE);
    new RoundToDoubleTester(maxDoubleAsBD).setExpectation(Double.MAX_VALUE, values()).test();
  }

  public void testRoundToDouble_maxDoublePlusOne() {
    BigDecimal maxDoubleAsBD = new BigDecimal(Double.MAX_VALUE).add(BigDecimal.ONE);
    new RoundToDoubleTester(maxDoubleAsBD)

    }

    @Override
    public BigDecimal getMinimum() {
        return minimum;
    }

    @Override
    public void setMinimum(BigDecimal minimum) {
        this.minimum = minimum;
    }

    @Override
    public BigDecimal getMaximum() {
        return maximum;
    }

    @Override
    public void setMaximum(BigDecimal maximum) {
        this.maximum = maximum;
    }

    @Override
    double roundToDoubleArbitrarily(BigDecimal bigDecimal) {
      return bigDecimal.doubleValue();
    }

    @Override
    int sign(BigDecimal bigDecimal) {
      return bigDecimal.signum();
    }

    @Override
    BigDecimal toX(double d, RoundingMode mode) {
      return new BigDecimal(d);
    }

    @Override
    BigDecimal minus(BigDecimal a, BigDecimal b) {
      return a.subtract(b);
    }
  }

        assertEquals(new BigDecimal("1"), BigDecimalConversionUtil.toBigDecimal(Byte.valueOf((byte) 1)));
        assertEquals(new BigDecimal("10"), BigDecimalConversionUtil.toBigDecimal(Short.valueOf((short) 10)));
        assertEquals(new BigDecimal("100"), BigDecimalConversionUtil.toBigDecimal(Integer.valueOf(100)));
        assertEquals(new BigDecimal("1000"), BigDecimalConversionUtil.toBigDecimal(Long.valueOf(1000L)));

            }
            return normalize(new BigDecimal(s));
        } else {
            return normalize(new BigDecimal(o.toString()));
        }
    }

    /**
     * {@link BigDecimal}を文字列に変換します。
     *
     * @param dec
     *            変換元の{@link BigDecimal}
     * @return 変換された文字列
     */
    public static String toString(final BigDecimal dec) {
        return dec.toPlainString();
    }

        if (getRunTestCount() == 0) {
            return null;
        }

        BigDecimal runTests = BigDecimal.valueOf(getRunTestCount());
        BigDecimal successful = BigDecimal.valueOf(getRunTestCount() - getFailureCount());

        return successful.divide(runTests, 2, RoundingMode.DOWN).multiply(BigDecimal.valueOf(100)).intValue();
    }

    protected void failed(TestResult failedTest) {