GraphQL-295: [Place order] Place order mutation

Author: naydav

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

@@ -55,7 +55,7 @@ public function testGetCart()
 
         self::assertNotEmpty($response['cart']['items'][0]['id']);
         self::assertEquals(2, $response['cart']['items'][0]['qty']);
-        self::assertEquals('simple', $response['cart']['items'][0]['product']['sku']);
+        self::assertEquals('simple_product', $response['cart']['items'][0]['product']['sku']);
 
         self::assertNotEmpty($response['cart']['items'][1]['id']);
         self::assertEquals(2, $response['cart']['items'][1]['qty']);

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

@@ -47,7 +47,7 @@ public function testGetCart()
 
         self::assertNotEmpty($response['cart']['items'][0]['id']);
         self::assertEquals(2, $response['cart']['items'][0]['qty']);
-        self::assertEquals('simple', $response['cart']['items'][0]['product']['sku']);
+        self::assertEquals('simple_product', $response['cart']['items'][0]['product']['sku']);
 
         self::assertNotEmpty($response['cart']['items'][1]['id']);
         self::assertEquals(2, $response['cart']['items'][1]['qty']);