Inheritance: extends Illuminate\Database\Eloquent\Model, use trait Cviebrock\EloquentTaggable\Taggable
 public function testWithoutTags()
 {
     /** @var Collection $models */
     $models = TestModel::withoutTags()->get();
     $keys = $models->modelKeys();
     $this->assertArrayValuesAreEqual([$this->testModel->getKey()], $keys);
 }
 /**
  * Helper to generate a test model
  *
  * @param array $data
  * @return \Cviebrock\EloquentTaggable\Test\TestModel
  */
 protected function newModel($data = ['title' => 'test'])
 {
     return TestModel::create($data);
 }