public function testGetProductBySkuEmpty() { $sku = 'test_sku_1'; $product = $this->mockModel('catalog/product', array('getIdBySku')); $this->_mockGetIdBySku($product, $sku); $result = $this->_object->getProductBySku($sku); $this->assertInstanceOf('Mage_Catalog_Model_Product', $result); }