assertEquals(1,jointds.getListProperty(JointDataSet.DATA_SETS_PROP).size());
assertEquals(2,jointds.getListProperty(JointDataSet.DATA_SETS_PROP).size());
	public void testAddDataSet( ) throws Exception	{	    openDesign(filename);		JointDataSetHandle jointds = designHandle.findJointDataSet("JointDataSet");		//add data set to jointdataset		jointds.addDataSet("ds1");		jointds.addDataSet("ds2");		assertEquals(2,jointds.getListProperty(JointDataSet.DATA_SETS_PROP).size());				//remove data set from jointdataset		jointds.removeDataSet("ds2");		assertEquals(1,jointds.getListProperty(JointDataSet.DATA_SETS_PROP).size());	}