public function testAddProductWithoutSession()
 {
     /** @var $product \Magento\Catalog\Model\Product */
     $product = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create('Magento\\Catalog\\Model\\Product')->load(1);
     $this->_model->addProduct($product);
     $this->assertFalse($this->_model->hasItems(1, $this->_visitor->getId()));
     $this->assertTrue($this->_model->hasItems(0, $this->_visitor->getId()));
 }