title: How to mock ShareDirectoryClient GetFilesAndDirectoriesAsync xUnit
body: <p>How to mock ShareDirectoryClient's GetFilesAndDirectoriesAsync function in xUnit .Net Core 5</p>
  <p>I am trying to mock <code>public Mock&lt;ShareDirectoryClient&gt; mockShareDirectoryClient = new Mock&lt;ShareDirectoryClient&gt;();</code></p>
  <p>But facing issue in creating instance of ShareFileItem.</p>
  <p>Since ShareFileItem is a abstract class we can not create new instance.</p>