ENGCOM-6830: Unit tests for Magento\Csp\Model\Mode\ConfigManager and Magento\Csp\Observer\Render #26770

 - Merge Pull Request #26770 from karyna-tsymbal-atwix/magento2:unit-test-csp-Render-and-ConfigManager
 - Merged commits:
   1. f7988a8
   2. 9c75294
   3. 512ca69

Author: magento-engcom-team

app/code/Magento/Csp/Test/Unit/Observer/RenderTest.php

@@ -0,0 +1,52 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+declare(strict_types=1);
+
+namespace Magento\Csp\Test\Unit\Observer;
+
+use Magento\Csp\Api\CspRendererInterface;
+use Magento\Csp\Observer\Render;
+use Magento\Framework\App\Response\Http as ResponseHttp;
+use Magento\Framework\Event;
+use Magento\Framework\Event\Observer;
+use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit Test for \Magento\Csp\Observer\Render
+ */
+class RenderTest extends TestCase
+{
+    /**
+     * Check if the render method is called
+     */
+    public function testExecuteExpectsRenderCalled()
+    {
+        $eventMock = $this->createMock(Event::class);
+        $responseMock = $this->createMock(ResponseHttp::class);
+        $eventMock->expects($this->once())
+            ->method('getData')
+            ->with('response')
+            ->willReturn($responseMock);
+
+        /** @var MockObject|Observer $eventObserverMock */
+        $eventObserverMock = $this->createMock(Observer::class);
+        $eventObserverMock->expects($this->once())->method('getEvent')->willReturn($eventMock);
+
+        $cspRendererMock = $this->createMock(CspRendererInterface::class);
+        $cspRendererMock->expects($this->once())->method('render');
+
+        $objectManagerHelper = new ObjectManager($this);
+        /** @var Render $renderObserver */
+        $renderObserver = $objectManagerHelper->getObject(
+            Render::class,
+            ['cspRenderer' => $cspRendererMock]
+        );
+        $renderObserver->execute($eventObserverMock);
+    }
+}