x1.addProperty("key2", "value2");
x1.addProperty("key2[@override]", "USER2");
XMLConfiguration x2 = new XMLConfiguration();
x2.addProperty("key2", "value2.2");
x2.addProperty("key2[@override]", "USER2");
config.setNodeCombiner(new OverrideCombiner());
config.addConfiguration(x2);
config.addConfiguration(x1);
XMLConfiguration x3 = new XMLConfiguration(config);
assertEquals("Wrong element value", "value2.2", x3.getString("key2"));
assertEquals("Wrong attribute value", "USER2",