### Question:
TimestampField implements FieldType<Timestamp> { @Override public Timestamp getDefaultValue() { return defaultValue; } TimestampField();  TimestampField(final Timestamp defaultValue);  TimestampField(final boolean withTimeZone);  TimestampField(final int precision);  TimestampField(final boolean withTimeZone, final Timestamp defaultValue);  TimestampField(final boolean withTimeZone, final int precision);  TimestampField(final boolean withTimeZone, final int precision, final Timestamp defaultValue); @Override Types getType(); boolean isWithTimeZone(); int getPrecision(); @Override Timestamp getDefaultValue(); @Override boolean hasDefaultValue(); @Override final Timestamp convert(Object objValue); @Override JSONObject toJson();  }### Answer:
@Test public void testGetDefaultValue() throws OperationException { System.out.println("getDefaultValue"); Timestamp defaultValue = new Timestamp(System.currentTimeMillis()); TimestampField instance; instance = new TimestampField(); assertNull(instance.getDefaultValue()); instance = new TimestampField(defaultValue); assertEquals(defaultValue, instance.getDefaultValue()); instance = new TimestampField(true); assertNull(instance.getDefaultValue()); instance = new TimestampField(2); assertNull(instance.getDefaultValue()); instance = new TimestampField(true, defaultValue); assertEquals(defaultValue, instance.getDefaultValue()); instance = new TimestampField(true, 2); assertEquals(2, instance.getPrecision()); instance = new TimestampField(true, 2, defaultValue); assertEquals(defaultValue, instance.getDefaultValue()); }