[Unit] Add promotion coupon applying tests

tests/Api/DataFixtures/ORM/promotion/product.yaml

@@ -3,7 +3,17 @@ Sylius\Component\Core\Model\Product:
         code: 'CAP'
         channels: ['@channel_web']
         currentLocale: 'en_US'
-    product_socks:
-        code: 'SOCKS'
-        channels: ['@channel_web']
+
+Sylius\Component\Core\Model\ProductVariant:
+    product_variant_cap_blue:
+        code: 'CAP_BLUE'
+        product: '@product_cap'
         currentLocale: 'en_US'
+        channelPricings:
+            WEB: '@channel_pricing_cap_blue_web'
+
+Sylius\Component\Core\Model\ChannelPricing:
+    channel_pricing_cap_blue_web:
+        channelCode: 'WEB'
+        price: 2000
+        originalPrice: 3000

tests/Api/DataFixtures/ORM/promotion/promotion_coupon_expired.yaml

@@ -0,0 +1,29 @@
+Sylius\Component\Core\Model\Promotion:
+    promotion_active:
+        code: 'promotion_active'
+        name: 'Active promotion with expired coupon'
+        description: 'This promotion is active but the coupon has already expired'
+        channels: ['@channel_web']
+        priority: 1
+        exclusive: true
+        appliesToDiscounted: false
+        usageLimit: 1
+        used: 0
+        couponBased: true
+        translations:
+            - '@promotion_active_en'
+
+Sylius\Component\Promotion\Model\PromotionTranslation:
+    promotion_active_en:
+        locale: 'en_US'
+        label: 'Active promotion with expired coupon'
+        translatable: '@promotion_active'
+
+Sylius\Component\Core\Model\PromotionCoupon:
+    promotion_coupon_expired:
+        code: 'PROMOTION_COUPON_EXPIRED'
+        usageLimit: null
+        perCustomerUsageLimit: null
+        reusableFromCancelledOrders: false
+        promotion: '@promotion_active'
+        expiresAt: <dateTimeBetween('-2 month', '-1 month')>

tests/Api/DataFixtures/ORM/promotion/promotion_ended_with_valid_coupon.yaml

@@ -0,0 +1,30 @@
+Sylius\Component\Core\Model\Promotion:
+    promotion_ended:
+        code: 'promotion_ended'
+        name: 'Ended promotion with valid coupon'
+        description: 'This promotion has already ended but the coupon is still valid'
+        channels: ['@channel_web']
+        priority: 1
+        exclusive: true
+        appliesToDiscounted: false
+        usageLimit: 1
+        used: 0
+        couponBased: true
+        endsAt: <dateTimeBetween('-1 month', '-1 day')>
+        translations:
+            - '@promotion_ended_en'
+
+Sylius\Component\Promotion\Model\PromotionTranslation:
+    promotion_ended_en:
+        locale: 'en_US'
+        label: 'Ended promotion with valid coupon'
+        translatable: '@promotion_ended'
+
+Sylius\Component\Core\Model\PromotionCoupon:
+    promotion_coupon_valid:
+        code: 'PROMOTION_COUPON_VALID'
+        usageLimit: null
+        perCustomerUsageLimit: null
+        reusableFromCancelledOrders: false
+        promotion: '@promotion_ended'
+        expiresAt: <dateTimeBetween('+1 month', '+2 month')>

tests/Api/DataFixtures/ORM/promotion/promotion_ineligible.yaml

@@ -0,0 +1,43 @@
+Sylius\Component\Core\Model\Promotion:
+    promotion_ineligible:
+        code: 'promotion_ineligible'
+        name: 'Ineligible promotion'
+        description: 'This promotion is not eligible for the cart that contains more than 10 items'
+        channels: ['@channel_web']
+        priority: 1
+        exclusive: true
+        appliesToDiscounted: false
+        usageLimit: 1
+        used: 0
+        couponBased: true
+        translations:
+            - '@promotion_ineligible_en'
+
+Sylius\Component\Promotion\Model\PromotionTranslation:
+    promotion_ineligible_en:
+        locale: 'en_US'
+        label: 'Ineligible'
+        translatable: '@promotion_ineligible'
+
+Sylius\Component\Core\Model\PromotionCoupon:
+    promotion_coupon_ineligible:
+        code: 'ELIGIBLE_COUPON_WITH_INELIGIBLE_PROMOTION'
+        usageLimit: null
+        perCustomerUsageLimit: null
+        reusableFromCancelledOrders: false
+        promotion: '@promotion_ineligible'
+
+Sylius\Component\Promotion\Model\PromotionRule:
+    promotion_rule_cart_quantity_more_than_10:
+        type: "cart_quantity"
+        promotion: "@promotion_ineligible"
+        configuration:
+            count: 5
+
+Sylius\Component\Promotion\Model\PromotionAction:
+    promotion_action_unit_fixed_discount_100:
+        type: "unit_fixed_discount"
+        promotion: "@promotion_ineligible"
+        configuration:
+            WEB:
+                amount: 100

tests/Api/Shop/Checkout/CartTest.php

@@ -24,6 +24,7 @@ final class CartTest extends JsonApiTestCase
     protected function setUp(): void
     {
         $this->setUpOrderPlacer();
+        $this->setUpDefaultPutHeaders();
 
         parent::setUp();
     }
@@ -598,6 +599,93 @@ final class CartTest extends JsonApiTestCase
         );
     }
 
+    /** @test */
+    public function it_does_not_apply_invalid_coupon_code(): void
+    {
+        $this->loadFixturesFromFiles([
+            'promotion/channel.yaml',
+            'promotion/product.yaml',
+        ]);
+
+        $tokenValue = $this->pickUpCart();
+        $this->addItemToCart('CAP_BLUE', 1, $tokenValue);
+
+        $this->requestPut(
+            uri: sprintf('/api/v2/shop/orders/%s', $tokenValue),
+            body: ['couponCode' => 'INVALID'],
+        );
+
+        $this->assertResponseViolations($this->client->getResponse(), [
+            ['propertyPath' => 'couponCode', 'message' => 'Coupon code is invalid.'],
+        ]);
+    }
+
+    /** @test */
+    public function it_does_not_apply_expired_coupon_code(): void
+    {
+        $this->loadFixturesFromFiles([
+            'promotion/channel.yaml',
+            'promotion/product.yaml',
+            'promotion/promotion_coupon_expired.yaml',
+        ]);
+
+        $tokenValue = $this->pickUpCart();
+        $this->addItemToCart('CAP_BLUE', 1, $tokenValue);
+
+        $this->requestPut(
+            uri: sprintf('/api/v2/shop/orders/%s', $tokenValue),
+            body: ['couponCode' => 'PROMOTION_COUPON_EXPIRED'],
+        );
+
+        $this->assertResponseViolations($this->client->getResponse(), [
+            ['propertyPath' => 'couponCode', 'message' => 'Coupon code has expired.'],
+        ]);
+    }
+
+    /** @test */
+    public function it_does_not_apply_a_valid_coupon_code_of_ended_promotion(): void
+    {
+        $this->loadFixturesFromFiles([
+            'promotion/channel.yaml',
+            'promotion/promotion_ended_with_valid_coupon.yaml',
+            'promotion/product.yaml',
+        ]);
+
+        $tokenValue = $this->pickUpCart();
+        $this->addItemToCart('CAP_BLUE', 1, $tokenValue);
+
+        $this->requestPut(
+            uri: sprintf('/api/v2/shop/orders/%s', $tokenValue),
+            body: ['couponCode' => 'PROMOTION_COUPON_VALID'],
+        );
+
+        $this->assertResponseViolations($this->client->getResponse(), [
+            ['propertyPath' => 'couponCode', 'message' => 'Coupon code is not valid for this order.'],
+        ]);
+    }
+
+    /** @test */
+    public function it_does_not_apply_valid_coupon_with_ineligible_promotion(): void
+    {
+        $this->loadFixturesFromFiles([
+            'promotion/channel.yaml',
+            'promotion/promotion_ineligible.yaml',
+            'promotion/product.yaml',
+        ]);
+
+        $tokenValue = $this->pickUpCart();
+        $this->addItemToCart('CAP_BLUE', 1, $tokenValue);
+
+        $this->requestPut(
+            uri: sprintf('/api/v2/shop/orders/%s', $tokenValue),
+            body: ['couponCode' => 'ELIGIBLE_COUPON_WITH_INELIGIBLE_PROMOTION'],
+        );
+
+        $this->assertResponseViolations($this->client->getResponse(), [
+            ['propertyPath' => 'couponCode', 'message' => 'Coupon code is not valid for this order.'],
+        ]);
+    }
+
     /** @test */
     public function it_deletes_cart(): void
     {