A test model that customizes the Slugify engine with custom rules.
Inheritance: extends Cviebrock\EloquentSluggable\Tests\Models\Post
 /**
  * Test using custom Slugify rules.
  *
  * @test
  */
 public function testCustomEngineRules()
 {
     $post = new PostWithCustomEngine(['title' => 'The quick brown fox jumps over the lazy dog']);
     $post->save();
     $this->assertEquals('tha-qaack-brawn-fax-jamps-avar-tha-lazy-dag', $post->slug);
 }