Bug 183918 get relative file path of linkage library
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/library/DesignLoadLibraryTest.java
assertEquals(
				"Cell 1-2", cell.getContent( ).get( 0 ).getStringProperty( LabelHandle.TEXT_PROP ) ); 
		
		row = (RowHandle) detailSlot.get( 1 );
		cell = (CellHandle) row.getCells( ).get( 0 ); 
		TableHandle innerTable = (TableHandle) cell.getContent( ).get( 0 );
		assertEquals( "libInnerTable", innerTable.getName( ) ); 
	}
	/**
	 * Tests adding library.
	 * 
	 * @throws Exception
	 *             if any exception
	 */
	public void testAddingLibrary( ) throws Exception
	{
		openDesign( "DesignWithoutLibrary.xml" ); 
		
		designHandle.includeLibrary( "Library_1.xml", "Lib1" ); 
		try
		{
			designHandle.includeLibrary( "Library_1.xml", "Lib2" ); 
			fail( );
		}
		catch ( LibraryException e )
		{
			assertEquals(
					LibraryException.DESIGN_EXCEPTION_LIBRARY_ALREADY_INCLUDED,
					e.getErrorCode( ) );
		}