SimpleAttributeSet s = new SimpleAttributeSet();
harness.check(s.containsAttribute("X1", "Y1"), false);
s.addAttribute("X1", "Y1");
harness.check(s.containsAttribute("X1", "Y1"), true);
harness.check(s.containsAttribute("X1", "Y2"), false);
harness.check(s.containsAttribute("X2", "Y1"), false);
// check with resolve parent
SimpleAttributeSet sParent = new SimpleAttributeSet();
sParent.addAttribute("X2", "Y2");
s.setResolveParent(sParent);