CountingAppender caRoot = new CountingAppender();
Category root = Category.getRoot();
root.addAppender(caRoot);
Hierarchy h = Category.getDefaultHierarchy();
h.disableDebug();
assertEquals(caRoot.counter, 0);
root.debug(MSG); assertEquals(caRoot.counter, 0);
root.info(MSG); assertEquals(caRoot.counter, 1);
root.log(Priority.WARN, MSG); assertEquals(caRoot.counter, 2);