assertEquals(xml, ganttChartDO.getGanttObjectsAsXml());
assertEquals("duration", BigDecimal.TEN, findById(ganttObject, getTask(prefix + "1").getId()).getDuration());
assertEquals("startDate", dh.getDate(), findById(ganttObject, getTask(prefix + "1").getId()).getStartDate());
assertNull("Start date should be stored as null (start date of task is set).",
findById(ganttObject, getTask(prefix + "1").getId())
.getStartDate());
findById(ganttObject, getTask(prefix + "1").getId()).addChild(new GanttTaskImpl(-1).setTitle("Child of 1"));
findById(ganttObject, getTask(prefix + "1.1").getId()).addChild(