#481 Created a webapi test for removing coupon from the guest quote

Author: Roman Glushko

dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/RemoveCouponFromCartTest.php

@@ -0,0 +1,143 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Quote\Guest;
+
+use Magento\Quote\Model\Quote;
+use Magento\Quote\Model\QuoteIdToMaskedQuoteIdInterface;
+use Magento\Quote\Model\ResourceModel\Quote as QuoteResource;
+use Magento\TestFramework\Helper\Bootstrap;
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+/**
+ * Test for getting cart information
+ */
+class RemoveCouponFromCartTest extends GraphQlAbstract
+{
+    /**
+     * @var QuoteResource
+     */
+    private $quoteResource;
+
+    /**
+     * @var Quote
+     */
+    private $quote;
+
+    /**
+     * @var QuoteIdToMaskedQuoteIdInterface
+     */
+    private $quoteIdToMaskedId;
+
+    protected function setUp()
+    {
+        $objectManager = Bootstrap::getObjectManager();
+        $this->quoteResource = $objectManager->create(QuoteResource::class);
+        $this->quote = $objectManager->create(Quote::class);
+        $this->quoteIdToMaskedId = $objectManager->create(QuoteIdToMaskedQuoteIdInterface::class);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Checkout/_files/quote_with_simple_product_saved.php
+     * @magentoApiDataFixture Magento/SalesRule/_files/coupon_code_with_wildcard.php
+     */
+    public function testRemoveCouponFromCart()
+    {
+        $couponCode = '2?ds5!2d';
+
+        /* Apply coupon to the quote */
+        $this->quoteResource->load(
+            $this->quote,
+            'test_order_with_simple_product_without_address',
+            'reserved_order_id'
+        );
+
+        $maskedQuoteId = $this->quoteIdToMaskedId->execute((int)$this->quote->getId());
+
+        $query = $this->prepareAddCouponRequestQuery($maskedQuoteId, $couponCode);
+        $this->graphQlQuery($query);
+
+        /* Remove coupon from quote */
+        $query = $this->prepareRemoveCouponRequestQuery($maskedQuoteId);
+        $response = $this->graphQlQuery($query);
+
+        self::assertArrayHasKey('removeCouponFromCart', $response);
+        self::assertNull($response['removeCouponFromCart']['cart']['applied_coupon']['code']);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Checkout/_files/quote_with_simple_product_saved.php
+     * @magentoApiDataFixture Magento/SalesRule/_files/coupon_code_with_wildcard.php
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     */
+    public function testRemoveCouponFromCustomerCart()
+    {
+        $this->quoteResource->load(
+            $this->quote,
+            'test_order_with_simple_product_without_address',
+            'reserved_order_id'
+        );
+        $maskedQuoteId = $this->quoteIdToMaskedId->execute((int)$this->quote->getId());
+
+        $this->quote->setCustomerId(1);
+        $this->quoteResource->save($this->quote);
+        $query = $this->prepareRemoveCouponRequestQuery($maskedQuoteId);
+
+        self::expectExceptionMessage('The current user cannot perform operations on cart "' . $maskedQuoteId . '"');
+        $this->graphQlQuery($query);
+    }
+
+    public function testRemoveCouponFromNonExistentCart()
+    {
+        $maskedQuoteId = '1234000000099912';
+
+        /* Remove coupon from quote */
+        $query = $this->prepareRemoveCouponRequestQuery($maskedQuoteId);
+
+        self::expectExceptionMessage('Could not find a cart with ID "' . $maskedQuoteId. '"');
+        $this->graphQlQuery($query);
+    }
+
+    /**
+     * @param string $maskedQuoteId
+     * @param string $couponCode
+     * @return string
+     */
+    private function prepareAddCouponRequestQuery(string $maskedQuoteId, string $couponCode): string
+    {
+        return <<<QUERY
+mutation {
+  applyCouponToCart(input: {cart_id: "$maskedQuoteId", coupon_code: "$couponCode"}) {
+    cart {
+      applied_coupon {
+        code
+      }
+    }
+  }
+}
+QUERY;
+    }
+
+    /**
+     * @param string $maskedQuoteId
+     * @return string
+     */
+    private function prepareRemoveCouponRequestQuery(string $maskedQuoteId): string
+    {
+        return <<<QUERY
+mutation {
+  removeCouponFromCart(input: {cart_id: "$maskedQuoteId"}) {
+    cart {
+      applied_coupon {
+        code
+      }
+    }
+  }
+}
+QUERY;
+    }
+}