title: In unity, after LoadScene, is there common way to wait all monobehaviour#start to finish
body: <p>following is my unitytest code:</p>
  
  <pre><code>        LoadScene("Scene/Level-2");
          yield return new WaitUntil(() =&gt; { return GameObject.FindObjectOfType&lt;Arrow&gt;(); });
          var arrow = GameObject.FindObjectOfType&lt;Arrow&gt;();
  </code></pre>
  
  <p>I load a scene and WaitUntil some object is loaded</p>
  
  <p>I hope find a way to omit <code>yield return new WaitUntil</code>, so is there way to  wait all MonoBehaviour#Start finish and then run code?</p>