public function testIfWillDeletePlainDocumentByPk()
{
$model = new PlainWithBasicAttributes();
$model->_id = new MongoId();
$em = new EntityManager($model);
$em->save();
$finder = new Finder($model);
$found = $finder->findByPk($model->_id);
$this->assertInstanceOf(PlainWithBasicAttributes::class, $found);
$em->deleteByPk($model->_id);
$notFound = $finder->findByPk($model->_id);
$this->assertNull($notFound);
}