MAGETWO-85610: magento#12656: Checkout: Whitespace in front of coupon code causes "Coupon code is not valid" magento#1021

Author: Oleksii Korshenko

app/code/Magento/Quote/Model/CouponManagement.php

@@ -50,6 +50,7 @@ public function get($cartId)
      */
     public function set($cartId, $couponCode)
     {
+        $couponCode = trim($couponCode);
         /** @var  \Magento\Quote\Model\Quote $quote */
         $quote = $this->quoteRepository->getActive($cartId);
         if (!$quote->getItemsCount()) {

dev/tests/api-functional/testsuite/Magento/Quote/Api/CouponManagementTest.php

@@ -297,4 +297,46 @@ public function testSetMyCouponSuccess()
 
         $this->assertEquals($quoteWithCoupon->getCouponCode(), $couponCode);
     }
+
+    /**
+     * @magentoApiDataFixture Magento/Sales/_files/quote.php
+     * @magentoApiDataFixture Magento/Checkout/_files/discount_10percent.php
+     */
+    public function testSetCouponWihSpaces()
+    {
+        /** @var \Magento\Quote\Model\Quote $quote */
+        $quote = $this->objectManager->create(\Magento\Quote\Model\Quote::class);
+        $quote->load('test01', 'reserved_order_id');
+        $cartId = $quote->getId();
+        /** @var \Magento\SalesRule\Model\Rule $salesRule */
+        $salesRule = $this->objectManager->create(\Magento\SalesRule\Model\Rule::class);
+        $salesRuleId = $this->objectManager->get(\Magento\Framework\Registry::class)
+            ->registry('Magento/Checkout/_file/discount_10percent');
+        $salesRule->load($salesRuleId);
+        $couponCode = $salesRule->getPrimaryCoupon()->getCode() ;
+        $serviceInfo = [
+            'rest' => [
+                'resourcePath' => self::RESOURCE_PATH . $cartId . '/coupons/'
+                    . rawurlencode(' ') . $couponCode . rawurlencode(' '),
+                'httpMethod' => \Magento\Framework\Webapi\Rest\Request::HTTP_METHOD_PUT,
+            ],
+            'soap' => [
+                'service' => self::SERVICE_NAME,
+                'serviceVersion' => self::SERVICE_VERSION,
+                'operation' => self::SERVICE_NAME . 'Set',
+            ],
+        ];
+
+        $requestData = [
+            "cartId" => $cartId,
+            "couponCode" => $couponCode,
+        ];
+
+        $this->assertTrue($this->_webApiCall($serviceInfo, $requestData));
+
+        $quoteWithCoupon = $this->objectManager->create(\Magento\Quote\Model\Quote::class);
+        $quoteWithCoupon->load('test01', 'reserved_order_id');
+
+        $this->assertEquals($quoteWithCoupon->getCouponCode(), $couponCode);
+    }
 }