ENGCOM-4495: graphQl-430: added testReSetPaymentMethod for guest and customer #471

 - Merge Pull Request magento/graphql-ce#471 from magento/graphql-ce:GrqphQL-430-test-testReSetPaymentMethod
 - Merged commits:
   1. 80499c9

Author: magento-engcom-team

dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/SetPaymentMethodOnCartTest.php

@@ -171,6 +171,23 @@ public function testPaymentMethodOnNonExistentCart()
         $this->graphQlQuery($query, [], '', $this->getHeaderMap());
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Checkout/_files/quote_with_payment_saved.php
+     */
+    public function testReSetPayment()
+    {
+        /** @var \Magento\Quote\Model\Quote  $quote */
+        $maskedQuoteId = $this->getMaskedQuoteIdByReversedQuoteId('test_order_1_with_payment');
+        $methodCode = Checkmo::PAYMENT_METHOD_CHECKMO_CODE;
+        $query = $this->prepareMutationQuery($maskedQuoteId, $methodCode);
+        $response = $this->graphQlQuery($query, [], '', $this->getHeaderMap());
+
+        self::assertArrayHasKey('setPaymentMethodOnCart', $response);
+        self::assertArrayHasKey('cart', $response['setPaymentMethodOnCart']);
+        self::assertArrayHasKey('selected_payment_method', $response['setPaymentMethodOnCart']['cart']);
+        self::assertEquals($methodCode, $response['setPaymentMethodOnCart']['cart']['selected_payment_method']['code']);
+    }
+
     /**
      * @param string $maskedQuoteId
      * @param string $methodCode

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

@@ -145,6 +145,24 @@ public function testSetPaymentOnNonExistentCart()
         $this->graphQlQuery($query);
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Checkout/_files/quote_with_payment_saved.php
+     */
+    public function testReSetPayment()
+    {
+        /** @var \Magento\Quote\Model\Quote  $quote */
+        $maskedQuoteId = $this->getMaskedQuoteIdByReversedQuoteId('test_order_1_with_payment');
+        $this->unAssignCustomerFromQuote('test_order_1_with_payment');
+        $methodCode = Checkmo::PAYMENT_METHOD_CHECKMO_CODE;
+        $query = $this->prepareMutationQuery($maskedQuoteId, $methodCode);
+        $response = $this->graphQlQuery($query);
+
+        self::assertArrayHasKey('setPaymentMethodOnCart', $response);
+        self::assertArrayHasKey('cart', $response['setPaymentMethodOnCart']);
+        self::assertArrayHasKey('selected_payment_method', $response['setPaymentMethodOnCart']['cart']);
+        self::assertEquals($methodCode, $response['setPaymentMethodOnCart']['cart']['selected_payment_method']['code']);
+    }
+
     /**
      * @param string $maskedQuoteId
      * @param string $methodCode