test: add cart and wishlist tests

tests/WishlistTest.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace Bazaar\Tests;
+
+use Bazaar\Repositories\UserRepository;
+use Bazaar\Repositories\WishlistRepository;
+
+final class WishlistTest extends DatabaseTestCase
+{
+    private WishlistRepository $wishlist;
+    private int $userId;
+    private int $otherUserId;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->wishlist = new WishlistRepository($this->db);
+        $users = new UserRepository($this->db);
+        $this->userId = $users->create('a@bazaar.test', 'hash', 'A');
+        $this->otherUserId = $users->create('b@bazaar.test', 'hash', 'B');
+    }
+
+    public function testToggleAddsThenRemoves(): void
+    {
+        $productId = $this->seedProduct('Mug', 1200, 5);
+
+        $this->assertTrue($this->wishlist->toggle($this->userId, $productId));
+        $this->assertTrue($this->wishlist->has($this->userId, $productId));
+
+        $this->assertFalse($this->wishlist->toggle($this->userId, $productId));
+        $this->assertFalse($this->wishlist->has($this->userId, $productId));
+    }
+
+    public function testAddIsIdempotent(): void
+    {
+        $productId = $this->seedProduct('Mug', 1200, 5);
+
+        $this->wishlist->add($this->userId, $productId);
+        $this->wishlist->add($this->userId, $productId);
+
+        $this->assertSame(1, $this->wishlist->count($this->userId));
+    }
+
+    public function testWishlistIsScopedPerUser(): void
+    {
+        $productId = $this->seedProduct('Mug', 1200, 5);
+        $this->wishlist->add($this->userId, $productId);
+
+        $this->assertTrue($this->wishlist->has($this->userId, $productId));
+        $this->assertFalse($this->wishlist->has($this->otherUserId, $productId));
+        $this->assertSame(0, $this->wishlist->count($this->otherUserId));
+    }
+
+    public function testForUserReturnsProductRows(): void
+    {
+        $first = $this->seedProduct('Mug', 1200, 5);
+        $second = $this->seedProduct('Plate', 1800, 5);
+        $this->wishlist->add($this->userId, $first);
+        $this->wishlist->add($this->userId, $second);
+
+        $rows = $this->wishlist->forUser($this->userId);
+        $this->assertCount(2, $rows);
+        $this->assertSame([$first, $second], array_values(array_reverse(array_map('intval', array_column($rows, 'id')))));
+    }
+}