ENGCOM-6987: Unit test for UpdateElementTypesObserver #27010

 - Merge Pull Request #27010 from mmezhensky/magento2:unittest-UpdateElementTypesObserverTest
 - Merged commits:
   1. 7448fd3

Author: magento-engcom-team

app/code/Magento/Weee/Test/Unit/Observer/UpdateElementTypesObserverTest.php

@@ -0,0 +1,105 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+declare(strict_types=1);
+
+namespace Magento\Weee\Test\Unit\Observer;
+
+use Magento\Framework\DataObject;
+use Magento\Framework\Event\Observer;
+use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
+use Magento\Reports\Model\Event;
+use Magento\Weee\Block\Element\Weee\Tax;
+use Magento\Weee\Observer\UpdateElementTypesObserver;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit test for Magento\Weee\Observer\UpdateElementTypesObserver
+ */
+class UpdateElementTypesObserverTest extends TestCase
+{
+    /*
+     * Stub response type
+     */
+    const STUB_RESPONSE_TYPE = [];
+
+    /**
+     * Testable Object
+     *
+     * @var UpdateElementTypesObserver
+     */
+    private $observer;
+
+    /**
+     * @var ObjectManager
+     */
+    private $objectManager;
+
+    /**
+     * @var Observer|MockObject
+     */
+    private $observerMock;
+
+    /**
+     * @var Event|MockObject
+     */
+    private $eventMock;
+
+    /**
+     * @var DataObject|MockObject
+     */
+    private $responseMock;
+
+    /**
+     * @inheritDoc
+     */
+    protected function setUp(): void
+    {
+        $this->objectManager = new ObjectManager($this);
+        $this->observerMock = $this->createMock(Observer::class);
+
+        $this->eventMock = $this->getMockBuilder(Event::class)
+            ->disableOriginalConstructor()
+            ->setMethods(['getResponse'])
+            ->getMock();
+
+        $this->responseMock = $this->getMockBuilder(DataObject::class)
+            ->disableOriginalConstructor()
+            ->setMethods(['getTypes', 'setTypes'])
+            ->getMock();
+
+        $this->observer = $this->objectManager->getObject(UpdateElementTypesObserver::class);
+    }
+
+    /**
+     * Test for execute(), covers test case to adding custom element type for attributes form
+     */
+    public function testRemoveProductUrlsFromStorage(): void
+    {
+        $this->observerMock
+            ->expects($this->once())
+            ->method('getEvent')
+            ->willReturn($this->eventMock);
+
+        $this->eventMock
+            ->expects($this->once())
+            ->method('getResponse')
+            ->willReturn($this->responseMock);
+
+        $this->responseMock
+            ->expects($this->once())
+            ->method('getTypes')
+            ->willReturn(self::STUB_RESPONSE_TYPE);
+
+        $this->responseMock
+            ->expects($this->once())
+            ->method('setTypes')
+            ->with(['weee' => Tax::class]);
+
+        $this->observer->execute($this->observerMock);
+    }
+}