/**
  * Добавление продукта
  */
 public function testAttachProduct()
 {
     /**
      * @var $purchase_model \App\Models\PurchaseModel
      */
     $purchase_model = \App\Models\PurchaseModel::find(self::$purchase_id);
     $this->assertInstanceOf('\\App\\Models\\PurchaseModel', $purchase_model);
     $products_count = rand(2, 5);
     $products_models_arr = \App\BusinessLogic\Models\Product::take($products_count)->get();
     //$this->assertEquals(count($products_models_arr), $products_count);
     $products_appended_ids_arr = [];
     foreach ($products_models_arr as $product_model) {
         $product_appended = $purchase_model->appendProduct($product_model);
         $this->assertTrue($product_appended);
         $products_appended_ids_arr[] = $product_model->id;
     }
     $products_in_purchase_arr = \DB::table($purchase_model->products()->getTable())->where('purchase_id', '=', $purchase_model->id)->get(['product_id']);
     $this->assertNotEmpty($products_in_purchase_arr);
     $products_in_purchase_ids_arr = [];
     foreach ($products_in_purchase_arr as $product_in_purchase_obj) {
         $products_in_purchase_ids_arr[] = $product_in_purchase_obj->product_id;
     }
     foreach ($products_appended_ids_arr as $product_appended_id) {
         $this->assertContains($product_appended_id, $products_in_purchase_ids_arr);
     }
     self::$products_appended_ids_arr = $products_appended_ids_arr;
 }
 /**
  * Возвращает список продуктов
  * @return mixed
  */
 public function getProductsList()
 {
     return \App\BusinessLogic\Models\Product::take(50)->get();
 }