LogglyTree extends Timber.Tree { public void tag(String tag) { loggly.setTags(tag); } LogglyTree(String token);   LogglyTree(ILogglyClient client, ILogglyClient.Callback handler, IFormatter formatter); void tag(String tag);  }
@Test public void tagSetsLogglyTags() { final String tag = "foo"; tree.tag(tag); verify(client).setTags(tag); }