p1 = new CategoryLabelPositions(
            new CategoryLabelPosition(RA_BOTTOM, TextBlockAnchor.TOP_CENTER), 
            new CategoryLabelPosition(RA_BOTTOM, TextBlockAnchor.TOP_CENTER), 
            new CategoryLabelPosition(RA_BOTTOM, TextBlockAnchor.TOP_CENTER), 
            new CategoryLabelPosition(RA_TOP, TextBlockAnchor.CENTER) 
        );
        assertTrue(!p1.equals(p2));
        p2 = new CategoryLabelPositions(
            new CategoryLabelPosition(RA_BOTTOM, TextBlockAnchor.TOP_CENTER), 
            new CategoryLabelPosition(RA_BOTTOM, TextBlockAnchor.TOP_CENTER), 
            new CategoryLabelPosition(RA_BOTTOM, TextBlockAnchor.TOP_CENTER), 
            new CategoryLabelPosition(RA_TOP, TextBlockAnchor.CENTER) 
        ); 
        assertTrue(p1.equals(p2));