A test model that uses a custom suffix generation method.
Inheritance: extends Cviebrock\EloquentSluggable\Tests\Models\Post
 /**
  * Test building a slug using a custom suffix.
  *
  * @test
  */
 public function testCustomSuffix()
 {
     for ($i = 0; $i < 20; $i++) {
         $post = PostWithCustomSuffix::create(['title' => 'A Post Title', 'subtitle' => 'A Subtitle']);
         if ($i === 0) {
             $this->assertEquals('a-post-title', $post->slug);
         } else {
             $this->assertEquals('a-post-title-' . chr($i + 96), $post->slug);
         }
     }
 }