add price feature

tests/Feature/EventListener/OrderItemPreFlushTest.php

@@ -0,0 +1,45 @@
+<?php declare(strict_types=1);
+
+use App\Entity\FoodOrder;
+use App\Entity\FoodVendor;
+use App\Entity\OrderItem;
+
+pest()
+    ->beforeEach(function (): void {
+        $this->setEntityClass(FoodOrder::class);
+        $this->setPath('/food/order/');
+        $this->repository = $this->manager->getRepository($this->entityClass);
+        $this->vendor = new FoodVendor;
+        $this->vendor->setName('Food Vendor');
+
+        $this->manager->persist($this->vendor);
+
+        $this->order = new FoodOrder;
+        $this->order->setFoodVendor($this->vendor);
+
+        $this->manager->persist($this->order);
+        $this->manager->flush();
+    });
+
+it('updates the menu item price', function (): void {
+    $orderItem = new OrderItem;
+    $orderItem->setFoodOrder($this->order);
+    $orderItem->setName('Item');
+    $orderItem->setPriceCents(100);
+
+    $this->manager->persist($orderItem);
+    $this->manager->flush();
+
+    expect($orderItem->getMenuItem()->getPriceCents())
+        ->toBe(100);
+
+    $orderItem->setPriceCents(200);
+    $this->manager->persist($orderItem);
+    $this->manager->flush();
+
+    $id = $orderItem->getId();
+
+    $orderItem = $this->manager->find(OrderItem::class, $id);
+    expect($orderItem->getMenuItem()->getPriceCents())
+        ->toBe(200);
+});