/**
* @Then /^(its) subtotal should be ([^"]+)$/
*/
public function itemSubtotalShouldBe($itemName, $subtotal)
{
$itemSubtotalOnPage = $this->showPage->getItemSubtotal($itemName);
Assert::eq($itemSubtotalOnPage, $subtotal, 'Item subtotal is %s, but should be %s.');
}