title: Laravel (Lumen) - Acting As A User In The Database
body: <p>When testing I am able to create a model factory and then act as that user e.g.<br>
  <code>$users = factory(User::class)-&gt;create();
   $this-&gt;actingAs($users)</code></p>
  
  <p>Would it be possible for me to act as a user who is already in the database, so say I could reference their ID number and then test as that user?</p>