Reviewed #4533, formatting and tweaks

- Updating formatting.
- Tweaked truncation to roughly match elipsis char to width used.
- Updated testing to use existing helpers, and ran check as admin user
  to avoid name conflicts.

app/Users/Models/User.php

@@ -345,7 +345,7 @@ class User extends Model implements AuthenticatableContract, CanResetPasswordCon
             return $splitName[0];
         }
 
-        return mb_substr($this->name, 0, $chars-3) . '…';
+        return mb_substr($this->name, 0, max($chars - 2, 0)) . '…';
     }
 
     /**