🤖 Add Inventory Management

laravel/app/Inventory.php

@@ -10,4 +10,13 @@ class Inventory extends Model
     use HasFactory;
 
     protected $table = 'inventory';
+    protected $fillable = ['product_id', 'quantity'];
+
+    /**
+     * Get the product that owns the inventory
+     */
+    public function product()
+    {
+        return $this->belongsTo(Product::class);
+    }
 }

laravel/database/migrations/2024_01_15_000001_create_inventory_table.php

@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateInventoryTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('inventory', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('product_id')->constrained('products')->onDelete('cascade');
+            $table->integer('quantity')->default(0);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('inventory');
+    }
+}

laravel/database/seeders/InventorySeeder.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Database\Seeders;
+
+use Illuminate\Database\Seeder;
+use App\Inventory;
+
+class InventorySeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     *
+     * @return void
+     */
+    public function run()
+    {
+        $products = [
+            ['id' => 1, 'quantity' => 10], // wrench
+            ['id' => 2, 'quantity' => 10], // nails
+            ['id' => 3, 'quantity' => 10]  // hammer
+        ];
+
+        foreach ($products as $product) {
+            Inventory::create(['product_id' => $product['id'], 'quantity' => $product['quantity']]);
+        }
+    }
+}

laravel/tests/Unit/InventoryTest.php

@@ -0,0 +1,101 @@
+<?php
+
+namespace Tests\Unit;
+
+use Tests\TestCase;
+use App\Product;
+use App\Inventory;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+class InventoryTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        // Create test products
+        Product::create([
+            'id' => 1,
+            'name' => 'Test Wrench',
+            'price' => 10.00
+        ]);
+    }
+
+    /**
+     * Test checkout with insufficient inventory
+     */
+    public function testCheckoutWithInsufficientInventory()
+    {
+        // Create cart with quantity more than available inventory
+        $cart = [
+            (object)[
+                'id' => 1,
+                'quantity' => 2 // More than available inventory (1)
+            ]
+        ];
+
+        // Set initial inventory
+        Inventory::create([
+            'product_id' => 1,
+            'quantity' => 1
+        ]);
+
+        // Make POST request to checkout endpoint
+        $response = $this->postJson('/checkout', [
+            'cart' => $cart,
+            'validate_inventory' => 'true',
+            'form' => [
+                'email' => '[email protected]',
+                'firstName' => 'Test',
+                'lastName' => 'User'
+            ]
+        ]);
+
+        // Assert response status is 400 (Bad Request)
+        $response->assertStatus(400);
+
+        // Assert error message
+        $response->assertJson([
+            'error' => 'Insufficient inventory for product: Test Wrench'
+        ]);
+    }
+
+    /**
+     * Test checkout with sufficient inventory
+     */
+    public function testCheckoutWithSufficientInventory()
+    {
+        // Create cart with quantity less than or equal to available inventory
+        $cart = [
+            (object)[
+                'id' => 1,
+                'quantity' => 1
+            ]
+        ];
+
+        // Set initial inventory
+        Inventory::create([
+            'product_id' => 1,
+            'quantity' => 1
+        ]);
+
+        // Make POST request to checkout endpoint
+        $response = $this->postJson('/checkout', [
+            'cart' => $cart,
+            'validate_inventory' => 'true',
+            'form' => [
+                'email' => '[email protected]',
+                'firstName' => 'Test',
+                'lastName' => 'User'
+            ]
+        ]);
+
+        // Assert response is successful
+        $response->assertStatus(200);
+
+        // Assert inventory was decremented
+        $this->assertEquals(0, Inventory::where('product_id', 1)->first()->quantity);
+    }
+}