MAGETWO-81926: Category hierarchy isn't updated on Product Admin page

Author: svitja

app/code/Magento/Catalog/Test/Unit/Controller/Adminhtml/Category/RefreshPathTest.php

@@ -0,0 +1,112 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+declare(strict_types=1);
+
+namespace Magento\Catalog\Test\Unit\Controller\Adminhtml\Category;
+
+use \Magento\Framework\Controller\Result\JsonFactory;
+use \Magento\Catalog\Controller\Adminhtml\Category\RefreshPath;
+use \Magento\Backend\App\Action\Context;
+use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
+
+class RefreshPathTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @var JsonFactory|\PHPUnit_Framework_MockObject_MockObject
+     */
+    private $resultJsonFactoryMock;
+
+    /**
+     * @var Context|\PHPUnit_Framework_MockObject_MockObject
+     */
+    private $contextMock;
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function setUp()
+    {
+        $this->resultJsonFactoryMock = $this->getMockBuilder(JsonFactory::class)
+            ->disableOriginalConstructor()
+            ->setMethods(['create', 'setData'])
+            ->getMock();
+
+        $this->contextMock = $this->getMockBuilder(Context::class)
+            ->disableOriginalConstructor()
+            ->setMethods(['getRequest'])
+            ->getMock();
+    }
+
+    /**
+     * Sets object non-public property.
+     *
+     * @param mixed $object
+     * @param string $propertyName
+     * @param mixed $value
+     *
+     * @return void
+     */
+    private function setObjectProperty($object, string $propertyName, $value)
+    {
+        $reflectionClass = new \ReflectionClass($object);
+        $reflectionProperty = $reflectionClass->getProperty($propertyName);
+        $reflectionProperty->setAccessible(true);
+        $reflectionProperty->setValue($object, $value);
+    }
+
+    /**
+     * @return void
+     */
+    public function testExecute()
+    {
+        $value = ['id' => 3, 'path' => '1/2/3', 'parentId' => 2];
+        $result = '{"id":3,"path":"1/2/3","parentId":"2"}';
+
+        $requestMock = $this->getMockForAbstractClass(\Magento\Framework\App\RequestInterface::class);
+
+        $refreshPath = $this->getMockBuilder(RefreshPath::class)
+            ->setMethods(['getRequest', 'create'])
+            ->setConstructorArgs([
+                $this->contextMock,
+                $this->resultJsonFactoryMock,
+            ])->getMock();
+
+        $refreshPath->expects($this->any())->method('getRequest')->willReturn($requestMock);
+        $requestMock->expects($this->any())->method('getParam')->with('id')->willReturn($value['id']);
+
+        $categoryMock = $this->getMockBuilder(\Magento\Catalog\Model\Category::class)
+            ->disableOriginalConstructor()
+            ->setMethods(['getPath', 'getParentID', 'getResource'])
+            ->getMock();
+
+        $categoryMock->expects($this->any())->method('getPath')->willReturn($value['path']);
+        $categoryMock->expects($this->any())->method('getParentID')->willReturn($value['parentId']);
+
+        $categoryResource = $this->createMock(\Magento\Catalog\Model\ResourceModel\Category::class);
+
+        $objectManagerMock = $this->getMockBuilder(ObjectManager::class)
+            ->disableOriginalConstructor()
+            ->setMethods(['create'])
+            ->getMock();
+
+        $this->setObjectProperty($refreshPath, '_objectManager', $objectManagerMock);
+        $this->setObjectProperty($categoryMock, '_resource', $categoryResource);
+
+        $objectManagerMock->expects($this->once())
+            ->method('create')
+            ->with(\Magento\Catalog\Model\Category::class)
+            ->willReturn($categoryMock);
+
+        $this->resultJsonFactoryMock->expects($this->any())->method('create')->willReturnSelf();
+        $this->resultJsonFactoryMock->expects($this->any())
+            ->method('setData')
+            ->with($value)
+            ->willReturn($result);
+
+        $this->assertEquals($result, $refreshPath->execute());
+    }
+}