title: BadMethodCallException: Call to undefined method League\Flysystem\Filesystem::assertExists
body: <p>I am working on tests for a laravel app using phpunit I am trying to run the following to make sure the file exists. </p>
  
  <pre><code>Storage::disk('local')-&gt;assertExists("mib_players.csv");
  </code></pre>
  
  <p>But when i run test I get the following error.</p>
  
  <pre><code>BadMethodCallException: Call to undefined method League\Flysystem\Filesystem::assertExists
  </code></pre>
  
  <p>Any help would be appreciated. </p>