Updated the discount controller to use the new API

#10

src/Cart/Cart.php

@@ -3,13 +3,15 @@
 namespace Happypixels\Shopr\Cart;
 
 use Illuminate\Support\Collection;
+use Happypixels\Shopr\Models\Order;
 use Illuminate\Support\Facades\Event;
 use Happypixels\Shopr\Money\Formatter;
 use Happypixels\Shopr\Contracts\Shoppable;
 use Happypixels\Shopr\Contracts\CartDriver;
 use Illuminate\Contracts\Support\Arrayable;
 use Happypixels\Shopr\Models\DiscountCoupon;
 use Happypixels\Shopr\Exceptions\CartItemNotFoundException;
+use Happypixels\Shopr\Exceptions\DiscountValidationException;
 
 class Cart implements Arrayable
 {
@@ -169,7 +171,10 @@ public function addDiscount($coupon)
         collect(config('shopr.discount_coupons.validation_rules'))->each(function ($rule) use ($coupon) {
             $rule = new $rule;
 
-            throw_if(!$rule->passes('code', $coupon->code), new \Exception($rule->message(), 422));
+            throw_if(
+                !$rule->passes('code', $coupon->code),
+                new DiscountValidationException($rule->message())
+            );
         });
 
         if (is_string($coupon)) {

src/Controllers/CartDiscountController.php

@@ -3,22 +3,14 @@
 namespace Happypixels\Shopr\Controllers;
 
 use Illuminate\Http\Request;
-use Happypixels\Shopr\Cart\Cart;
 use Illuminate\Routing\Controller;
-use Happypixels\Shopr\Models\DiscountCoupon;
+use Happypixels\Shopr\Facades\Cart;
 use Illuminate\Foundation\Validation\ValidatesRequests;
 
 class CartDiscountController extends Controller
 {
     use ValidatesRequests;
 
-    protected $cart;
-
-    public function __construct(Cart $cart)
-    {
-        $this->cart = $cart;
-    }
-
     /**
      * Applies a discount coupon to the cart.
      *
@@ -27,22 +19,10 @@ public function __construct(Cart $cart)
      */
     public function store(Request $request)
     {
-        // Default validation rules that are always checked.
-        $rules = ['required', 'string'];
-
-        // Configurated rules.
-        if (! empty(config('shopr.discount_coupons.validation_rules'))) {
-            foreach (config('shopr.discount_coupons.validation_rules') as $rule) {
-                $rules[] = new $rule;
-            }
-        }
-
-        $this->validate($request, ['code' => $rules]);
-
-        $coupon = DiscountCoupon::where('code', $request->code)->first();
+        $this->validate($request, ['code' => ['required', 'string']]);
 
-        $this->cart->addDiscount($coupon);
+        Cart::addDiscount($request->code);
 
-        return $this->cart->summary();
+        return Cart::get();
     }
 }

src/Exceptions/DiscountValidationException.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Happypixels\Shopr\Exceptions;
+
+use Exception;
+
+class DiscountValidationException extends Exception
+{
+    /**
+     * The message of the exception.
+     *
+     * @var string
+     */
+    protected $message;
+
+    /**
+     * The status code of the exception.
+     *
+     * @var int
+     */
+    protected $code = 422;
+
+    /**
+     * Create an instance of the exception.
+     *
+     * @param string $message
+     */
+    public function __construct($message)
+    {
+        $this->message = $message;
+    }
+
+    /**
+     * Render the exception into an HTTP response.
+     *
+     * @param  \Illuminate\Http\Request
+     * @return \Illuminate\Http\Response
+     */
+    public function render($request)
+    {
+        return response()->json(['message' => $this->message], $this->code);
+    }
+}

tests/Http/Discounts/AddDiscountHttpTest.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Happypixels\Shopr\Tests\Http\Discounts;
+
+use Happypixels\Shopr\Facades\Cart;
+use Happypixels\Shopr\Tests\TestCase;
+use Happypixels\Shopr\Models\DiscountCoupon;
+use Happypixels\Shopr\Tests\Support\Traits\InteractsWithCart;
+
+class AddDiscountHttpTest extends TestCase
+{
+    use InteractsWithCart;
+
+    /** @test */
+    public function it_adds_the_coupon()
+    {
+        $this->withoutExceptionHandling();
+
+        $discount = factory(DiscountCoupon::class)->create();
+
+        Cart::shouldReceive('addDiscount')->once()->with($discount->code);
+        Cart::shouldReceive('get')->once()->andReturn(['result']);
+
+        $this->json('POST', 'api/shopr/cart/discounts', ['code' => $discount->code])
+            ->assertStatus(200)
+            ->assertJson(['result']);
+    }
+
+    /** @test */
+    public function it_validates_the_code()
+    {
+        $this->json('POST', 'api/shopr/cart/discounts', ['code' => ''])->assertStatus(422);
+    }
+
+    /** @test */
+    public function it_validates_configurated_rules()
+    {
+        $discount = factory(DiscountCoupon::class)->create();
+
+        $this->json('POST', 'api/shopr/cart/discounts', ['code' => $discount->code])
+            ->assertStatus(422)
+            ->assertJsonFragment(['message' => trans('shopr::cart.cart_is_empty')]);
+    }
+}