### Question:
DecimalOption extends ValueOption<DecimalOption> { public BigDecimal or(BigDecimal alternate) { if (nullValue) { return alternate; } return get(); } DecimalOption();  DecimalOption(BigDecimal valueOrNull); BigDecimal get(); BigDecimal or(BigDecimal alternate); void add(BigDecimal delta); void add(DecimalOption other); @Deprecated DecimalOption modify(BigDecimal newValue); @Override @Deprecated void copyFrom(DecimalOption optionOrNull); @Override int hashCode(); @Override boolean equals(Object obj); boolean has(BigDecimal other); @Override int compareTo(WritableRawComparable o); @Override String toString(); @Override void write(DataOutput out); @SuppressWarnings("deprecation") @Override void readFields(DataInput in); @SuppressWarnings("deprecation") @Override int restore(byte[] bytes, int offset, int limit); @Override int getSizeInBytes(byte[] buf, int offset); @Override int compareInBytes(byte[] b1, int o1, byte[] b2, int o2); static int getBytesLength(byte[] bytes, int offset, int length); static int compareBytes(
            byte[] b1, int s1, int l1,
            byte[] b2, int s2, int l2);  }### Answer:
@Test public void or() { DecimalOption option = new DecimalOption(); assertThat(option.or(decimal(30)), is(decimal(30))); assertThat(option.isNull(), is(true)); }