@Override
  public Double getNumber( Object object ) throws KettleValueException {
    Long timestampAsInteger = getInteger( object );
    if ( null != timestampAsInteger ) {
      return timestampAsInteger.doubleValue();
    } else {
      return null;
    }
  }
@Test
  public void testConvertTimestampToNumber_Null() throws KettleValueException {
    ValueMetaTimestamp valueMetaTimestamp = new ValueMetaTimestamp();
    assertNull( valueMetaTimestamp.getNumber( null ) );
  }