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dev/tests/api-functional/testsuite/Magento/GraphQl/TestModule/GraphQlMutationTest.php

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+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\TestModule;
+
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+/**
+ * Make sure that it is possible to use GraphQL mutations in Magento
+ */
+class GraphQlMutationTest extends GraphQlAbstract
+{
+    public function testMutation()
+    {
+        $id = 3;
+
+        $query = <<<MUTATION
+mutation {
+  testItem(id: {$id}) {
+    item_id
+    name
+    integer_list
+  }
+}
+MUTATION;
+
+        $response = $this->graphQlMutation($query);
+        $this->assertArrayHasKey('testItem', $response);
+        $testItem = $response['testItem'];
+        $this->assertArrayHasKey('integer_list', $testItem);
+        $this->assertEquals([4, 5, 6], $testItem['integer_list']);
+    }
+
+    /**
+     */
+    public function testMutationIsNotAllowedViaGetRequest()
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('Mutation requests allowed only for POST requests');
+
+        $id = 3;
+
+        $query = <<<MUTATION
+mutation {
+  testItem(id: {$id}) {
+    item_id
+    name
+    integer_list
+  }
+}
+MUTATION;
+
+        $this->graphQlQuery($query, [], '', []);
+    }
+}