MC-39638: Create automated test for: "Try to add the category without parent category"

Author: ysapiga

dev/tests/integration/testsuite/Magento/Catalog/Controller/Adminhtml/Category/AddTest.php

@@ -0,0 +1,60 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Catalog\Controller\Adminhtml\Category;
+
+use Magento\TestFramework\TestCase\AbstractBackendController;
+
+/**
+ * Tests for catalog category Add controller
+ *
+ * @see \Magento\Catalog\Controller\Adminhtml\Category\Add
+ *
+ * @magentoAppArea adminhtml
+ */
+class AddTest extends AbstractBackendController
+{
+    /**
+     * @var int
+     */
+    const DEFAULT_ROOT_CATEGORY = 2;
+
+    /**
+     * @inheritdoc
+     */
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->getRequest()->setParams([]);
+    }
+
+
+    /**
+     * @magentoDbIsolation enabled
+     *
+     * @return void
+     */
+    public function testExecuteWithoutParams(): void
+    {
+        $this->dispatch('backend/catalog/category/add');
+        $this->assertRedirect($this->stringContains('catalog/category/index'));
+    }
+
+    /**
+     * @magentoDbIsolation enabled
+     *
+     * @return void
+     */
+    public function testExecuteAsAjax(): void
+    {
+        $this->getRequest()->setQueryValue('isAjax', true);
+        $this->getRequest()->setParam('parent', self::DEFAULT_ROOT_CATEGORY);
+        $this->dispatch('backend/catalog/category/add');
+        $this->assertJson($this->getResponse()->getBody());
+    }
+}