### Question:
RemitSyncExecutor implements Handler.Callback { void removePostWithId(int id) { handler.removeMessages(id); } RemitSyncExecutor(@NonNull RemitAgent agent);   RemitSyncExecutor(@NonNull RemitAgent agent, @Nullable Handler handler,
                      @NonNull Set<Integer> freeToDBIdList); void postSyncInfoDelay(int id, long delayMillis); void postSync(int id); void postSync(List<Integer> idList); void postRemoveInfo(int id); void postRemoveFreeIds(List<Integer> idList); void postRemoveFreeId(int id); boolean handleMessage(Message msg);  }### Answer:
@Test public void removePostWithId() { executor.removePostWithId(1); verify(handler).removeMessages(eq(1)); }