RepoModelTest#testLoadRepos()加了ShadowLooper.runUiThreadTasksIncludingDelayedTasks()仍然一直在wait about android-unit-testing-tutorial HOT 1 CLOSED

Debug了一下，发现了原因，因为在执行ShadowLooper.runUiThreadTasksIncludingDelayedTasks();时，Scheduler里的runnables还没有任何runnable对象存在（因为是wait了1000ms后才post过来一个runnable对象）,所以Scheduler里的下面这个方法里的advanceTo其实并没有调用。

/**
   * Run all runnables in the queue.
   *
   * @return  True if a runnable was executed.
   */
  public synchronized boolean advanceToLastPostedRunnable() {
    return size() >= 1 && advanceTo(runnables.get(runnables.size() - 1).scheduledTime);
  }

所以要使得runnables有对象，只需要ShadowLooper.runUiThreadTasksIncludingDelayedTasks();前面再Thread.sleep(2000);就可以了。

from android-unit-testing-tutorial.