title: How to resolve a User for the first time(hasn't met before) on TestServer?
body: <p>I'm just started to use <strong>Pyrogram</strong> to develop TG-Clients. for a starter, tried to pilot my scripts on <strong>[Test servers]</strong> to ensure things are fine. So created two user's account by the client-library itself <em><strong>(test numbers)</strong></em> then tried to run a sample workflow by <strong>interactions</strong> between those accounts, but seems there's no way to <strong>&quot;meet&quot;</strong> one with another <em><strong>(which is a precondition to be able to interact)</strong></em>.
  <strong>BTW:</strong>
  Already tried to <code>add_contact()</code>, <code>create_group()</code>, <code>send_message()</code> <em><strong>to &quot;self&quot; including &quot;target-account&quot; mentioned in the message</strong></em>, but all of those considered as &quot;interactions&quot; and follow the same scheme (<em><strong>target User needed to exist in the .session local file</strong></em> to be able to interact with).
  I gonna need a way to resolve User despite having that in the .session file (something like <strong>Search User by its id/phone/username</strong>)
  Any suggestion would be appreciated.
  <strong>P.S:</strong>
  For what it worth, the &quot;callback code&quot; from TG-TestServers auth workflow, recently has changed from (Five-Times DC number to Six-Times) that needs to be corrected in the docs <a href="https://docs.pyrogram.org/topics/test-servers#test-numbers" rel="nofollow noreferrer">https://docs.pyrogram.org/topics/test-servers#test-numbers</a>
  Stay Safe All
  PEACE V</p>